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aff92b8286
VFIO is (except devices without a physical IOMMU or some mediated devices) incompatible with discarding of RAM. The kernel will pin basically all VM memory. Let's convert to ram_block_discard_disable(), which can now fail, in contrast to qemu_balloon_inhibit(). Leave "x-balloon-allowed" named as it is for now. Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com> Acked-by: Cornelia Huck <cohuck@redhat.com> Cc: Cornelia Huck <cohuck@redhat.com> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Tony Krowiak <akrowiak@linux.ibm.com> Cc: Halil Pasic <pasic@linux.ibm.com> Cc: Pierre Morel <pmorel@linux.ibm.com> Cc: Eric Farman <farman@linux.ibm.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20200626072248.78761-4-david@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1789 lines
55 KiB
C
1789 lines
55 KiB
C
/*
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* generic functions used by VFIO devices
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Authors:
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* Alex Williamson <alex.williamson@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Based on qemu-kvm device-assignment:
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* Adapted for KVM by Qumranet.
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* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
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* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
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* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
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* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
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* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
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*/
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#include "qemu/osdep.h"
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#include <sys/ioctl.h>
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#ifdef CONFIG_KVM
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#include <linux/kvm.h>
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#endif
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#include <linux/vfio.h>
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#include "hw/vfio/vfio-common.h"
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#include "hw/vfio/vfio.h"
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#include "exec/address-spaces.h"
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#include "exec/memory.h"
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#include "hw/hw.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "qemu/range.h"
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#include "sysemu/kvm.h"
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#include "sysemu/reset.h"
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#include "trace.h"
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#include "qapi/error.h"
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VFIOGroupList vfio_group_list =
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QLIST_HEAD_INITIALIZER(vfio_group_list);
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static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
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QLIST_HEAD_INITIALIZER(vfio_address_spaces);
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#ifdef CONFIG_KVM
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/*
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* We have a single VFIO pseudo device per KVM VM. Once created it lives
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* for the life of the VM. Closing the file descriptor only drops our
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* reference to it and the device's reference to kvm. Therefore once
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* initialized, this file descriptor is only released on QEMU exit and
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* we'll re-use it should another vfio device be attached before then.
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*/
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static int vfio_kvm_device_fd = -1;
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#endif
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/*
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* Common VFIO interrupt disable
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*/
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void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
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.index = index,
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.start = 0,
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.count = 0,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
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.index = index,
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.start = 0,
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.count = 1,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
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.index = index,
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.start = 0,
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.count = 1,
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};
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ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
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}
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static inline const char *action_to_str(int action)
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{
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switch (action) {
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case VFIO_IRQ_SET_ACTION_MASK:
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return "MASK";
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case VFIO_IRQ_SET_ACTION_UNMASK:
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return "UNMASK";
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case VFIO_IRQ_SET_ACTION_TRIGGER:
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return "TRIGGER";
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default:
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return "UNKNOWN ACTION";
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}
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}
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static const char *index_to_str(VFIODevice *vbasedev, int index)
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{
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if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
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return NULL;
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}
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switch (index) {
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case VFIO_PCI_INTX_IRQ_INDEX:
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return "INTX";
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case VFIO_PCI_MSI_IRQ_INDEX:
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return "MSI";
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case VFIO_PCI_MSIX_IRQ_INDEX:
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return "MSIX";
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case VFIO_PCI_ERR_IRQ_INDEX:
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return "ERR";
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case VFIO_PCI_REQ_IRQ_INDEX:
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return "REQ";
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default:
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return NULL;
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}
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}
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int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex,
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int action, int fd, Error **errp)
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{
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struct vfio_irq_set *irq_set;
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int argsz, ret = 0;
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const char *name;
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int32_t *pfd;
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argsz = sizeof(*irq_set) + sizeof(*pfd);
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irq_set = g_malloc0(argsz);
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irq_set->argsz = argsz;
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irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action;
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irq_set->index = index;
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irq_set->start = subindex;
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irq_set->count = 1;
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pfd = (int32_t *)&irq_set->data;
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*pfd = fd;
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if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
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ret = -errno;
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}
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g_free(irq_set);
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if (!ret) {
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return 0;
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}
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error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure");
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name = index_to_str(vbasedev, index);
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if (name) {
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error_prepend(errp, "%s-%d: ", name, subindex);
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} else {
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error_prepend(errp, "index %d-%d: ", index, subindex);
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}
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error_prepend(errp,
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"Failed to %s %s eventfd signaling for interrupt ",
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fd < 0 ? "tear down" : "set up", action_to_str(action));
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return ret;
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}
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/*
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* IO Port/MMIO - Beware of the endians, VFIO is always little endian
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*/
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void vfio_region_write(void *opaque, hwaddr addr,
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uint64_t data, unsigned size)
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{
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VFIORegion *region = opaque;
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VFIODevice *vbasedev = region->vbasedev;
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union {
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uint8_t byte;
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uint16_t word;
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uint32_t dword;
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uint64_t qword;
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} buf;
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switch (size) {
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case 1:
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buf.byte = data;
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break;
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case 2:
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buf.word = cpu_to_le16(data);
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break;
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case 4:
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buf.dword = cpu_to_le32(data);
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break;
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case 8:
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buf.qword = cpu_to_le64(data);
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break;
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default:
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hw_error("vfio: unsupported write size, %d bytes", size);
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break;
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}
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if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
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error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
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",%d) failed: %m",
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__func__, vbasedev->name, region->nr,
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addr, data, size);
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}
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trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
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/*
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* A read or write to a BAR always signals an INTx EOI. This will
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* do nothing if not pending (including not in INTx mode). We assume
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* that a BAR access is in response to an interrupt and that BAR
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* accesses will service the interrupt. Unfortunately, we don't know
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* which access will service the interrupt, so we're potentially
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* getting quite a few host interrupts per guest interrupt.
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*/
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vbasedev->ops->vfio_eoi(vbasedev);
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}
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uint64_t vfio_region_read(void *opaque,
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hwaddr addr, unsigned size)
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{
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VFIORegion *region = opaque;
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VFIODevice *vbasedev = region->vbasedev;
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union {
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uint8_t byte;
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uint16_t word;
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uint32_t dword;
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uint64_t qword;
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} buf;
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uint64_t data = 0;
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if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
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error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
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__func__, vbasedev->name, region->nr,
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addr, size);
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return (uint64_t)-1;
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}
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switch (size) {
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case 1:
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data = buf.byte;
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break;
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case 2:
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data = le16_to_cpu(buf.word);
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break;
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case 4:
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data = le32_to_cpu(buf.dword);
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break;
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case 8:
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data = le64_to_cpu(buf.qword);
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break;
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default:
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hw_error("vfio: unsupported read size, %d bytes", size);
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break;
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}
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trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
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/* Same as write above */
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vbasedev->ops->vfio_eoi(vbasedev);
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return data;
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}
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const MemoryRegionOps vfio_region_ops = {
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.read = vfio_region_read,
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.write = vfio_region_write,
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.endianness = DEVICE_LITTLE_ENDIAN,
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.valid = {
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.min_access_size = 1,
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.max_access_size = 8,
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},
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.impl = {
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.min_access_size = 1,
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.max_access_size = 8,
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},
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};
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/*
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* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
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*/
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static int vfio_dma_unmap(VFIOContainer *container,
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hwaddr iova, ram_addr_t size)
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{
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struct vfio_iommu_type1_dma_unmap unmap = {
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.argsz = sizeof(unmap),
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.flags = 0,
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.iova = iova,
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.size = size,
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};
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while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
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/*
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* The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
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* v4.15) where an overflow in its wrap-around check prevents us from
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* unmapping the last page of the address space. Test for the error
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* condition and re-try the unmap excluding the last page. The
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* expectation is that we've never mapped the last page anyway and this
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* unmap request comes via vIOMMU support which also makes it unlikely
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* that this page is used. This bug was introduced well after type1 v2
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* support was introduced, so we shouldn't need to test for v1. A fix
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* is queued for kernel v5.0 so this workaround can be removed once
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* affected kernels are sufficiently deprecated.
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*/
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if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
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container->iommu_type == VFIO_TYPE1v2_IOMMU) {
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trace_vfio_dma_unmap_overflow_workaround();
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unmap.size -= 1ULL << ctz64(container->pgsizes);
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continue;
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}
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error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
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return -errno;
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}
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return 0;
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}
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static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
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ram_addr_t size, void *vaddr, bool readonly)
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{
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struct vfio_iommu_type1_dma_map map = {
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.argsz = sizeof(map),
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.flags = VFIO_DMA_MAP_FLAG_READ,
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.vaddr = (__u64)(uintptr_t)vaddr,
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.iova = iova,
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.size = size,
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};
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if (!readonly) {
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map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
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}
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/*
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* Try the mapping, if it fails with EBUSY, unmap the region and try
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* again. This shouldn't be necessary, but we sometimes see it in
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* the VGA ROM space.
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*/
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if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
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(errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
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ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
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return 0;
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}
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error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
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return -errno;
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}
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static void vfio_host_win_add(VFIOContainer *container,
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hwaddr min_iova, hwaddr max_iova,
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uint64_t iova_pgsizes)
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{
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VFIOHostDMAWindow *hostwin;
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QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
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if (ranges_overlap(hostwin->min_iova,
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hostwin->max_iova - hostwin->min_iova + 1,
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min_iova,
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max_iova - min_iova + 1)) {
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hw_error("%s: Overlapped IOMMU are not enabled", __func__);
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}
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}
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hostwin = g_malloc0(sizeof(*hostwin));
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hostwin->min_iova = min_iova;
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hostwin->max_iova = max_iova;
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hostwin->iova_pgsizes = iova_pgsizes;
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QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
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}
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static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
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hwaddr max_iova)
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{
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VFIOHostDMAWindow *hostwin;
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QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
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if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) {
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QLIST_REMOVE(hostwin, hostwin_next);
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return 0;
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}
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}
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return -1;
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}
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static bool vfio_listener_skipped_section(MemoryRegionSection *section)
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{
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return (!memory_region_is_ram(section->mr) &&
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!memory_region_is_iommu(section->mr)) ||
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/*
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* Sizing an enabled 64-bit BAR can cause spurious mappings to
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* addresses in the upper part of the 64-bit address space. These
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* are never accessed by the CPU and beyond the address width of
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* some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
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*/
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section->offset_within_address_space & (1ULL << 63);
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}
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/* Called with rcu_read_lock held. */
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static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr,
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bool *read_only)
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{
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MemoryRegion *mr;
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hwaddr xlat;
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hwaddr len = iotlb->addr_mask + 1;
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bool writable = iotlb->perm & IOMMU_WO;
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/*
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* The IOMMU TLB entry we have just covers translation through
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* this IOMMU to its immediate target. We need to translate
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* it the rest of the way through to memory.
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*/
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mr = address_space_translate(&address_space_memory,
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iotlb->translated_addr,
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&xlat, &len, writable,
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MEMTXATTRS_UNSPECIFIED);
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if (!memory_region_is_ram(mr)) {
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error_report("iommu map to non memory area %"HWADDR_PRIx"",
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xlat);
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return false;
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}
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/*
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* Translation truncates length to the IOMMU page size,
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* check that it did not truncate too much.
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*/
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if (len & iotlb->addr_mask) {
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error_report("iommu has granularity incompatible with target AS");
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return false;
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}
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*vaddr = memory_region_get_ram_ptr(mr) + xlat;
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*read_only = !writable || mr->readonly;
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return true;
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}
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|
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static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
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{
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VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
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VFIOContainer *container = giommu->container;
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hwaddr iova = iotlb->iova + giommu->iommu_offset;
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bool read_only;
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void *vaddr;
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int ret;
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|
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trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
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iova, iova + iotlb->addr_mask);
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if (iotlb->target_as != &address_space_memory) {
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error_report("Wrong target AS \"%s\", only system memory is allowed",
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iotlb->target_as->name ? iotlb->target_as->name : "none");
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return;
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}
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|
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rcu_read_lock();
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|
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if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
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if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) {
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goto out;
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}
|
|
/*
|
|
* vaddr is only valid until rcu_read_unlock(). But after
|
|
* vfio_dma_map has set up the mapping the pages will be
|
|
* pinned by the kernel. This makes sure that the RAM backend
|
|
* of vaddr will always be there, even if the memory object is
|
|
* destroyed and its backing memory munmap-ed.
|
|
*/
|
|
ret = vfio_dma_map(container, iova,
|
|
iotlb->addr_mask + 1, vaddr,
|
|
read_only);
|
|
if (ret) {
|
|
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx", %p) = %d (%m)",
|
|
container, iova,
|
|
iotlb->addr_mask + 1, vaddr, ret);
|
|
}
|
|
} else {
|
|
ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1);
|
|
if (ret) {
|
|
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") = %d (%m)",
|
|
container, iova,
|
|
iotlb->addr_mask + 1, ret);
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void vfio_listener_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
|
|
hwaddr iova, end;
|
|
Int128 llend, llsize;
|
|
void *vaddr;
|
|
int ret;
|
|
VFIOHostDMAWindow *hostwin;
|
|
bool hostwin_found;
|
|
Error *err = NULL;
|
|
|
|
if (vfio_listener_skipped_section(section)) {
|
|
trace_vfio_listener_region_add_skip(
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(int128_sub(section->size, int128_one())));
|
|
return;
|
|
}
|
|
|
|
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
|
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
|
error_report("%s received unaligned region", __func__);
|
|
return;
|
|
}
|
|
|
|
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
|
|
llend = int128_make64(section->offset_within_address_space);
|
|
llend = int128_add(llend, section->size);
|
|
llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
|
|
|
|
if (int128_ge(int128_make64(iova), llend)) {
|
|
return;
|
|
}
|
|
end = int128_get64(int128_sub(llend, int128_one()));
|
|
|
|
if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
|
|
hwaddr pgsize = 0;
|
|
|
|
/* For now intersections are not allowed, we may relax this later */
|
|
QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
|
|
if (ranges_overlap(hostwin->min_iova,
|
|
hostwin->max_iova - hostwin->min_iova + 1,
|
|
section->offset_within_address_space,
|
|
int128_get64(section->size))) {
|
|
error_setg(&err,
|
|
"region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
|
|
"host DMA window [0x%"PRIx64",0x%"PRIx64"]",
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(section->size) - 1,
|
|
hostwin->min_iova, hostwin->max_iova);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
ret = vfio_spapr_create_window(container, section, &pgsize);
|
|
if (ret) {
|
|
error_setg_errno(&err, -ret, "Failed to create SPAPR window");
|
|
goto fail;
|
|
}
|
|
|
|
vfio_host_win_add(container, section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(section->size) - 1, pgsize);
|
|
#ifdef CONFIG_KVM
|
|
if (kvm_enabled()) {
|
|
VFIOGroup *group;
|
|
IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
|
|
struct kvm_vfio_spapr_tce param;
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_GROUP,
|
|
.attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
|
|
.addr = (uint64_t)(unsigned long)¶m,
|
|
};
|
|
|
|
if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
|
|
¶m.tablefd)) {
|
|
QLIST_FOREACH(group, &container->group_list, container_next) {
|
|
param.groupfd = group->fd;
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_report("vfio: failed to setup fd %d "
|
|
"for a group with fd %d: %s",
|
|
param.tablefd, param.groupfd,
|
|
strerror(errno));
|
|
return;
|
|
}
|
|
trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
hostwin_found = false;
|
|
QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
|
|
if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
|
|
hostwin_found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!hostwin_found) {
|
|
error_setg(&err, "Container %p can't map guest IOVA region"
|
|
" 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end);
|
|
goto fail;
|
|
}
|
|
|
|
memory_region_ref(section->mr);
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
VFIOGuestIOMMU *giommu;
|
|
IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
|
|
int iommu_idx;
|
|
|
|
trace_vfio_listener_region_add_iommu(iova, end);
|
|
/*
|
|
* FIXME: For VFIO iommu types which have KVM acceleration to
|
|
* avoid bouncing all map/unmaps through qemu this way, this
|
|
* would be the right place to wire that up (tell the KVM
|
|
* device emulation the VFIO iommu handles to use).
|
|
*/
|
|
giommu = g_malloc0(sizeof(*giommu));
|
|
giommu->iommu = iommu_mr;
|
|
giommu->iommu_offset = section->offset_within_address_space -
|
|
section->offset_within_region;
|
|
giommu->container = container;
|
|
llend = int128_add(int128_make64(section->offset_within_region),
|
|
section->size);
|
|
llend = int128_sub(llend, int128_one());
|
|
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
|
|
IOMMU_NOTIFIER_ALL,
|
|
section->offset_within_region,
|
|
int128_get64(llend),
|
|
iommu_idx);
|
|
|
|
ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
|
|
&err);
|
|
if (ret) {
|
|
g_free(giommu);
|
|
goto fail;
|
|
}
|
|
QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
|
|
memory_region_iommu_replay(giommu->iommu, &giommu->n);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Here we assume that memory_region_is_ram(section->mr)==true */
|
|
|
|
vaddr = memory_region_get_ram_ptr(section->mr) +
|
|
section->offset_within_region +
|
|
(iova - section->offset_within_address_space);
|
|
|
|
trace_vfio_listener_region_add_ram(iova, end, vaddr);
|
|
|
|
llsize = int128_sub(llend, int128_make64(iova));
|
|
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
|
|
|
|
if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
|
|
trace_vfio_listener_region_add_no_dma_map(
|
|
memory_region_name(section->mr),
|
|
section->offset_within_address_space,
|
|
int128_getlo(section->size),
|
|
pgmask + 1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
ret = vfio_dma_map(container, iova, int128_get64(llsize),
|
|
vaddr, section->readonly);
|
|
if (ret) {
|
|
error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx", %p) = %d (%m)",
|
|
container, iova, int128_get64(llsize), vaddr, ret);
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
/* Allow unexpected mappings not to be fatal for RAM devices */
|
|
error_report_err(err);
|
|
return;
|
|
}
|
|
goto fail;
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
error_report("failed to vfio_dma_map. pci p2p may not work");
|
|
return;
|
|
}
|
|
/*
|
|
* On the initfn path, store the first error in the container so we
|
|
* can gracefully fail. Runtime, there's not much we can do other
|
|
* than throw a hardware error.
|
|
*/
|
|
if (!container->initialized) {
|
|
if (!container->error) {
|
|
error_propagate_prepend(&container->error, err,
|
|
"Region %s: ",
|
|
memory_region_name(section->mr));
|
|
} else {
|
|
error_free(err);
|
|
}
|
|
} else {
|
|
error_report_err(err);
|
|
hw_error("vfio: DMA mapping failed, unable to continue");
|
|
}
|
|
}
|
|
|
|
static void vfio_listener_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
|
|
hwaddr iova, end;
|
|
Int128 llend, llsize;
|
|
int ret;
|
|
bool try_unmap = true;
|
|
|
|
if (vfio_listener_skipped_section(section)) {
|
|
trace_vfio_listener_region_del_skip(
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(int128_sub(section->size, int128_one())));
|
|
return;
|
|
}
|
|
|
|
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
|
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
|
error_report("%s received unaligned region", __func__);
|
|
return;
|
|
}
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
VFIOGuestIOMMU *giommu;
|
|
|
|
QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
|
|
if (MEMORY_REGION(giommu->iommu) == section->mr &&
|
|
giommu->n.start == section->offset_within_region) {
|
|
memory_region_unregister_iommu_notifier(section->mr,
|
|
&giommu->n);
|
|
QLIST_REMOVE(giommu, giommu_next);
|
|
g_free(giommu);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* FIXME: We assume the one big unmap below is adequate to
|
|
* remove any individual page mappings in the IOMMU which
|
|
* might have been copied into VFIO. This works for a page table
|
|
* based IOMMU where a big unmap flattens a large range of IO-PTEs.
|
|
* That may not be true for all IOMMU types.
|
|
*/
|
|
}
|
|
|
|
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
|
|
llend = int128_make64(section->offset_within_address_space);
|
|
llend = int128_add(llend, section->size);
|
|
llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
|
|
|
|
if (int128_ge(int128_make64(iova), llend)) {
|
|
return;
|
|
}
|
|
end = int128_get64(int128_sub(llend, int128_one()));
|
|
|
|
llsize = int128_sub(llend, int128_make64(iova));
|
|
|
|
trace_vfio_listener_region_del(iova, end);
|
|
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
hwaddr pgmask;
|
|
VFIOHostDMAWindow *hostwin;
|
|
bool hostwin_found = false;
|
|
|
|
QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
|
|
if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
|
|
hostwin_found = true;
|
|
break;
|
|
}
|
|
}
|
|
assert(hostwin_found); /* or region_add() would have failed */
|
|
|
|
pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
|
|
try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
|
|
}
|
|
|
|
if (try_unmap) {
|
|
ret = vfio_dma_unmap(container, iova, int128_get64(llsize));
|
|
if (ret) {
|
|
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") = %d (%m)",
|
|
container, iova, int128_get64(llsize), ret);
|
|
}
|
|
}
|
|
|
|
memory_region_unref(section->mr);
|
|
|
|
if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
|
|
vfio_spapr_remove_window(container,
|
|
section->offset_within_address_space);
|
|
if (vfio_host_win_del(container,
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(section->size) - 1) < 0) {
|
|
hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
|
|
__func__, section->offset_within_address_space);
|
|
}
|
|
}
|
|
}
|
|
|
|
static const MemoryListener vfio_memory_listener = {
|
|
.region_add = vfio_listener_region_add,
|
|
.region_del = vfio_listener_region_del,
|
|
};
|
|
|
|
static void vfio_listener_release(VFIOContainer *container)
|
|
{
|
|
memory_listener_unregister(&container->listener);
|
|
if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
|
|
memory_listener_unregister(&container->prereg_listener);
|
|
}
|
|
}
|
|
|
|
struct vfio_info_cap_header *
|
|
vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
|
|
{
|
|
struct vfio_info_cap_header *hdr;
|
|
void *ptr = info;
|
|
|
|
if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
|
|
return NULL;
|
|
}
|
|
|
|
for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
|
|
if (hdr->id == id) {
|
|
return hdr;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
|
|
struct vfio_region_info *info)
|
|
{
|
|
struct vfio_info_cap_header *hdr;
|
|
struct vfio_region_info_cap_sparse_mmap *sparse;
|
|
int i, j;
|
|
|
|
hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP);
|
|
if (!hdr) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header);
|
|
|
|
trace_vfio_region_sparse_mmap_header(region->vbasedev->name,
|
|
region->nr, sparse->nr_areas);
|
|
|
|
region->mmaps = g_new0(VFIOMmap, sparse->nr_areas);
|
|
|
|
for (i = 0, j = 0; i < sparse->nr_areas; i++) {
|
|
trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset,
|
|
sparse->areas[i].offset +
|
|
sparse->areas[i].size);
|
|
|
|
if (sparse->areas[i].size) {
|
|
region->mmaps[j].offset = sparse->areas[i].offset;
|
|
region->mmaps[j].size = sparse->areas[i].size;
|
|
j++;
|
|
}
|
|
}
|
|
|
|
region->nr_mmaps = j;
|
|
region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
|
|
int index, const char *name)
|
|
{
|
|
struct vfio_region_info *info;
|
|
int ret;
|
|
|
|
ret = vfio_get_region_info(vbasedev, index, &info);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
region->vbasedev = vbasedev;
|
|
region->flags = info->flags;
|
|
region->size = info->size;
|
|
region->fd_offset = info->offset;
|
|
region->nr = index;
|
|
|
|
if (region->size) {
|
|
region->mem = g_new0(MemoryRegion, 1);
|
|
memory_region_init_io(region->mem, obj, &vfio_region_ops,
|
|
region, name, region->size);
|
|
|
|
if (!vbasedev->no_mmap &&
|
|
region->flags & VFIO_REGION_INFO_FLAG_MMAP) {
|
|
|
|
ret = vfio_setup_region_sparse_mmaps(region, info);
|
|
|
|
if (ret) {
|
|
region->nr_mmaps = 1;
|
|
region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
|
|
region->mmaps[0].offset = 0;
|
|
region->mmaps[0].size = region->size;
|
|
}
|
|
}
|
|
}
|
|
|
|
g_free(info);
|
|
|
|
trace_vfio_region_setup(vbasedev->name, index, name,
|
|
region->flags, region->fd_offset, region->size);
|
|
return 0;
|
|
}
|
|
|
|
int vfio_region_mmap(VFIORegion *region)
|
|
{
|
|
int i, prot = 0;
|
|
char *name;
|
|
|
|
if (!region->mem) {
|
|
return 0;
|
|
}
|
|
|
|
prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
|
|
prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
|
|
MAP_SHARED, region->vbasedev->fd,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset);
|
|
if (region->mmaps[i].mmap == MAP_FAILED) {
|
|
int ret = -errno;
|
|
|
|
trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset +
|
|
region->mmaps[i].size - 1, ret);
|
|
|
|
region->mmaps[i].mmap = NULL;
|
|
|
|
for (i--; i >= 0; i--) {
|
|
memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem);
|
|
munmap(region->mmaps[i].mmap, region->mmaps[i].size);
|
|
object_unparent(OBJECT(®ion->mmaps[i].mem));
|
|
region->mmaps[i].mmap = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
name = g_strdup_printf("%s mmaps[%d]",
|
|
memory_region_name(region->mem), i);
|
|
memory_region_init_ram_device_ptr(®ion->mmaps[i].mem,
|
|
memory_region_owner(region->mem),
|
|
name, region->mmaps[i].size,
|
|
region->mmaps[i].mmap);
|
|
g_free(name);
|
|
memory_region_add_subregion(region->mem, region->mmaps[i].offset,
|
|
®ion->mmaps[i].mem);
|
|
|
|
trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem),
|
|
region->mmaps[i].offset,
|
|
region->mmaps[i].offset +
|
|
region->mmaps[i].size - 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void vfio_region_exit(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_exit(region->vbasedev->name, region->nr);
|
|
}
|
|
|
|
void vfio_region_finalize(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
munmap(region->mmaps[i].mmap, region->mmaps[i].size);
|
|
object_unparent(OBJECT(®ion->mmaps[i].mem));
|
|
}
|
|
}
|
|
|
|
object_unparent(OBJECT(region->mem));
|
|
|
|
g_free(region->mem);
|
|
g_free(region->mmaps);
|
|
|
|
trace_vfio_region_finalize(region->vbasedev->name, region->nr);
|
|
|
|
region->mem = NULL;
|
|
region->mmaps = NULL;
|
|
region->nr_mmaps = 0;
|
|
region->size = 0;
|
|
region->flags = 0;
|
|
region->nr = 0;
|
|
}
|
|
|
|
void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_set_enabled(®ion->mmaps[i].mem, enabled);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
|
|
enabled);
|
|
}
|
|
|
|
void vfio_reset_handler(void *opaque)
|
|
{
|
|
VFIOGroup *group;
|
|
VFIODevice *vbasedev;
|
|
|
|
QLIST_FOREACH(group, &vfio_group_list, next) {
|
|
QLIST_FOREACH(vbasedev, &group->device_list, next) {
|
|
if (vbasedev->dev->realized) {
|
|
vbasedev->ops->vfio_compute_needs_reset(vbasedev);
|
|
}
|
|
}
|
|
}
|
|
|
|
QLIST_FOREACH(group, &vfio_group_list, next) {
|
|
QLIST_FOREACH(vbasedev, &group->device_list, next) {
|
|
if (vbasedev->dev->realized && vbasedev->needs_reset) {
|
|
vbasedev->ops->vfio_hot_reset_multi(vbasedev);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vfio_kvm_device_add_group(VFIOGroup *group)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_GROUP,
|
|
.attr = KVM_DEV_VFIO_GROUP_ADD,
|
|
.addr = (uint64_t)(unsigned long)&group->fd,
|
|
};
|
|
|
|
if (!kvm_enabled()) {
|
|
return;
|
|
}
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
struct kvm_create_device cd = {
|
|
.type = KVM_DEV_TYPE_VFIO,
|
|
};
|
|
|
|
if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
|
|
error_report("Failed to create KVM VFIO device: %m");
|
|
return;
|
|
}
|
|
|
|
vfio_kvm_device_fd = cd.fd;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_report("Failed to add group %d to KVM VFIO device: %m",
|
|
group->groupid);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void vfio_kvm_device_del_group(VFIOGroup *group)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_GROUP,
|
|
.attr = KVM_DEV_VFIO_GROUP_DEL,
|
|
.addr = (uint64_t)(unsigned long)&group->fd,
|
|
};
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
return;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_report("Failed to remove group %d from KVM VFIO device: %m",
|
|
group->groupid);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
|
|
{
|
|
VFIOAddressSpace *space;
|
|
|
|
QLIST_FOREACH(space, &vfio_address_spaces, list) {
|
|
if (space->as == as) {
|
|
return space;
|
|
}
|
|
}
|
|
|
|
/* No suitable VFIOAddressSpace, create a new one */
|
|
space = g_malloc0(sizeof(*space));
|
|
space->as = as;
|
|
QLIST_INIT(&space->containers);
|
|
|
|
QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
|
|
|
|
return space;
|
|
}
|
|
|
|
static void vfio_put_address_space(VFIOAddressSpace *space)
|
|
{
|
|
if (QLIST_EMPTY(&space->containers)) {
|
|
QLIST_REMOVE(space, list);
|
|
g_free(space);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vfio_get_iommu_type - selects the richest iommu_type (v2 first)
|
|
*/
|
|
static int vfio_get_iommu_type(VFIOContainer *container,
|
|
Error **errp)
|
|
{
|
|
int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
|
|
VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
|
|
if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
|
|
return iommu_types[i];
|
|
}
|
|
}
|
|
error_setg(errp, "No available IOMMU models");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vfio_init_container(VFIOContainer *container, int group_fd,
|
|
Error **errp)
|
|
{
|
|
int iommu_type, ret;
|
|
|
|
iommu_type = vfio_get_iommu_type(container, errp);
|
|
if (iommu_type < 0) {
|
|
return iommu_type;
|
|
}
|
|
|
|
ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
|
|
if (ret) {
|
|
error_setg_errno(errp, errno, "Failed to set group container");
|
|
return -errno;
|
|
}
|
|
|
|
while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
|
|
if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
|
|
/*
|
|
* On sPAPR, despite the IOMMU subdriver always advertises v1 and
|
|
* v2, the running platform may not support v2 and there is no
|
|
* way to guess it until an IOMMU group gets added to the container.
|
|
* So in case it fails with v2, try v1 as a fallback.
|
|
*/
|
|
iommu_type = VFIO_SPAPR_TCE_IOMMU;
|
|
continue;
|
|
}
|
|
error_setg_errno(errp, errno, "Failed to set iommu for container");
|
|
return -errno;
|
|
}
|
|
|
|
container->iommu_type = iommu_type;
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
|
|
Error **errp)
|
|
{
|
|
VFIOContainer *container;
|
|
int ret, fd;
|
|
VFIOAddressSpace *space;
|
|
|
|
space = vfio_get_address_space(as);
|
|
|
|
/*
|
|
* VFIO is currently incompatible with discarding of RAM insofar as the
|
|
* madvise to purge (zap) the page from QEMU's address space does not
|
|
* interact with the memory API and therefore leaves stale virtual to
|
|
* physical mappings in the IOMMU if the page was previously pinned. We
|
|
* therefore set discarding broken for each group added to a container,
|
|
* whether the container is used individually or shared. This provides
|
|
* us with options to allow devices within a group to opt-in and allow
|
|
* discarding, so long as it is done consistently for a group (for instance
|
|
* if the device is an mdev device where it is known that the host vendor
|
|
* driver will never pin pages outside of the working set of the guest
|
|
* driver, which would thus not be discarding candidates).
|
|
*
|
|
* The first opportunity to induce pinning occurs here where we attempt to
|
|
* attach the group to existing containers within the AddressSpace. If any
|
|
* pages are already zapped from the virtual address space, such as from
|
|
* previous discards, new pinning will cause valid mappings to be
|
|
* re-established. Likewise, when the overall MemoryListener for a new
|
|
* container is registered, a replay of mappings within the AddressSpace
|
|
* will occur, re-establishing any previously zapped pages as well.
|
|
*
|
|
* Especially virtio-balloon is currently only prevented from discarding
|
|
* new memory, it will not yet set ram_block_discard_set_required() and
|
|
* therefore, neither stops us here or deals with the sudden memory
|
|
* consumption of inflated memory.
|
|
*/
|
|
ret = ram_block_discard_disable(true);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
|
|
return ret;
|
|
}
|
|
|
|
QLIST_FOREACH(container, &space->containers, next) {
|
|
if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
|
|
group->container = container;
|
|
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
|
|
vfio_kvm_device_add_group(group);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
|
|
ret = -errno;
|
|
goto put_space_exit;
|
|
}
|
|
|
|
ret = ioctl(fd, VFIO_GET_API_VERSION);
|
|
if (ret != VFIO_API_VERSION) {
|
|
error_setg(errp, "supported vfio version: %d, "
|
|
"reported version: %d", VFIO_API_VERSION, ret);
|
|
ret = -EINVAL;
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
container = g_malloc0(sizeof(*container));
|
|
container->space = space;
|
|
container->fd = fd;
|
|
container->error = NULL;
|
|
QLIST_INIT(&container->giommu_list);
|
|
QLIST_INIT(&container->hostwin_list);
|
|
|
|
ret = vfio_init_container(container, group->fd, errp);
|
|
if (ret) {
|
|
goto free_container_exit;
|
|
}
|
|
|
|
switch (container->iommu_type) {
|
|
case VFIO_TYPE1v2_IOMMU:
|
|
case VFIO_TYPE1_IOMMU:
|
|
{
|
|
struct vfio_iommu_type1_info info;
|
|
|
|
/*
|
|
* FIXME: This assumes that a Type1 IOMMU can map any 64-bit
|
|
* IOVA whatsoever. That's not actually true, but the current
|
|
* kernel interface doesn't tell us what it can map, and the
|
|
* existing Type1 IOMMUs generally support any IOVA we're
|
|
* going to actually try in practice.
|
|
*/
|
|
info.argsz = sizeof(info);
|
|
ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info);
|
|
/* Ignore errors */
|
|
if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) {
|
|
/* Assume 4k IOVA page size */
|
|
info.iova_pgsizes = 4096;
|
|
}
|
|
vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes);
|
|
container->pgsizes = info.iova_pgsizes;
|
|
break;
|
|
}
|
|
case VFIO_SPAPR_TCE_v2_IOMMU:
|
|
case VFIO_SPAPR_TCE_IOMMU:
|
|
{
|
|
struct vfio_iommu_spapr_tce_info info;
|
|
bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
|
|
|
|
/*
|
|
* The host kernel code implementing VFIO_IOMMU_DISABLE is called
|
|
* when container fd is closed so we do not call it explicitly
|
|
* in this file.
|
|
*/
|
|
if (!v2) {
|
|
ret = ioctl(fd, VFIO_IOMMU_ENABLE);
|
|
if (ret) {
|
|
error_setg_errno(errp, errno, "failed to enable container");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
} else {
|
|
container->prereg_listener = vfio_prereg_listener;
|
|
|
|
memory_listener_register(&container->prereg_listener,
|
|
&address_space_memory);
|
|
if (container->error) {
|
|
memory_listener_unregister(&container->prereg_listener);
|
|
ret = -1;
|
|
error_propagate_prepend(errp, container->error,
|
|
"RAM memory listener initialization failed: ");
|
|
goto free_container_exit;
|
|
}
|
|
}
|
|
|
|
info.argsz = sizeof(info);
|
|
ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
|
|
if (ret) {
|
|
error_setg_errno(errp, errno,
|
|
"VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
|
|
ret = -errno;
|
|
if (v2) {
|
|
memory_listener_unregister(&container->prereg_listener);
|
|
}
|
|
goto free_container_exit;
|
|
}
|
|
|
|
if (v2) {
|
|
container->pgsizes = info.ddw.pgsizes;
|
|
/*
|
|
* There is a default window in just created container.
|
|
* To make region_add/del simpler, we better remove this
|
|
* window now and let those iommu_listener callbacks
|
|
* create/remove them when needed.
|
|
*/
|
|
ret = vfio_spapr_remove_window(container, info.dma32_window_start);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret,
|
|
"failed to remove existing window");
|
|
goto free_container_exit;
|
|
}
|
|
} else {
|
|
/* The default table uses 4K pages */
|
|
container->pgsizes = 0x1000;
|
|
vfio_host_win_add(container, info.dma32_window_start,
|
|
info.dma32_window_start +
|
|
info.dma32_window_size - 1,
|
|
0x1000);
|
|
}
|
|
}
|
|
}
|
|
|
|
vfio_kvm_device_add_group(group);
|
|
|
|
QLIST_INIT(&container->group_list);
|
|
QLIST_INSERT_HEAD(&space->containers, container, next);
|
|
|
|
group->container = container;
|
|
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
|
|
|
|
container->listener = vfio_memory_listener;
|
|
|
|
memory_listener_register(&container->listener, container->space->as);
|
|
|
|
if (container->error) {
|
|
ret = -1;
|
|
error_propagate_prepend(errp, container->error,
|
|
"memory listener initialization failed: ");
|
|
goto listener_release_exit;
|
|
}
|
|
|
|
container->initialized = true;
|
|
|
|
return 0;
|
|
listener_release_exit:
|
|
QLIST_REMOVE(group, container_next);
|
|
QLIST_REMOVE(container, next);
|
|
vfio_kvm_device_del_group(group);
|
|
vfio_listener_release(container);
|
|
|
|
free_container_exit:
|
|
g_free(container);
|
|
|
|
close_fd_exit:
|
|
close(fd);
|
|
|
|
put_space_exit:
|
|
ram_block_discard_disable(false);
|
|
vfio_put_address_space(space);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void vfio_disconnect_container(VFIOGroup *group)
|
|
{
|
|
VFIOContainer *container = group->container;
|
|
|
|
QLIST_REMOVE(group, container_next);
|
|
group->container = NULL;
|
|
|
|
/*
|
|
* Explicitly release the listener first before unset container,
|
|
* since unset may destroy the backend container if it's the last
|
|
* group.
|
|
*/
|
|
if (QLIST_EMPTY(&container->group_list)) {
|
|
vfio_listener_release(container);
|
|
}
|
|
|
|
if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
|
|
error_report("vfio: error disconnecting group %d from container",
|
|
group->groupid);
|
|
}
|
|
|
|
if (QLIST_EMPTY(&container->group_list)) {
|
|
VFIOAddressSpace *space = container->space;
|
|
VFIOGuestIOMMU *giommu, *tmp;
|
|
|
|
QLIST_REMOVE(container, next);
|
|
|
|
QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
|
|
memory_region_unregister_iommu_notifier(
|
|
MEMORY_REGION(giommu->iommu), &giommu->n);
|
|
QLIST_REMOVE(giommu, giommu_next);
|
|
g_free(giommu);
|
|
}
|
|
|
|
trace_vfio_disconnect_container(container->fd);
|
|
close(container->fd);
|
|
g_free(container);
|
|
|
|
vfio_put_address_space(space);
|
|
}
|
|
}
|
|
|
|
VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
|
|
{
|
|
VFIOGroup *group;
|
|
char path[32];
|
|
struct vfio_group_status status = { .argsz = sizeof(status) };
|
|
|
|
QLIST_FOREACH(group, &vfio_group_list, next) {
|
|
if (group->groupid == groupid) {
|
|
/* Found it. Now is it already in the right context? */
|
|
if (group->container->space->as == as) {
|
|
return group;
|
|
} else {
|
|
error_setg(errp, "group %d used in multiple address spaces",
|
|
group->groupid);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
group = g_malloc0(sizeof(*group));
|
|
|
|
snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
|
|
group->fd = qemu_open(path, O_RDWR);
|
|
if (group->fd < 0) {
|
|
error_setg_errno(errp, errno, "failed to open %s", path);
|
|
goto free_group_exit;
|
|
}
|
|
|
|
if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
|
|
error_setg_errno(errp, errno, "failed to get group %d status", groupid);
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
|
|
error_setg(errp, "group %d is not viable", groupid);
|
|
error_append_hint(errp,
|
|
"Please ensure all devices within the iommu_group "
|
|
"are bound to their vfio bus driver.\n");
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
group->groupid = groupid;
|
|
QLIST_INIT(&group->device_list);
|
|
|
|
if (vfio_connect_container(group, as, errp)) {
|
|
error_prepend(errp, "failed to setup container for group %d: ",
|
|
groupid);
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
if (QLIST_EMPTY(&vfio_group_list)) {
|
|
qemu_register_reset(vfio_reset_handler, NULL);
|
|
}
|
|
|
|
QLIST_INSERT_HEAD(&vfio_group_list, group, next);
|
|
|
|
return group;
|
|
|
|
close_fd_exit:
|
|
close(group->fd);
|
|
|
|
free_group_exit:
|
|
g_free(group);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void vfio_put_group(VFIOGroup *group)
|
|
{
|
|
if (!group || !QLIST_EMPTY(&group->device_list)) {
|
|
return;
|
|
}
|
|
|
|
if (!group->ram_block_discard_allowed) {
|
|
ram_block_discard_disable(false);
|
|
}
|
|
vfio_kvm_device_del_group(group);
|
|
vfio_disconnect_container(group);
|
|
QLIST_REMOVE(group, next);
|
|
trace_vfio_put_group(group->fd);
|
|
close(group->fd);
|
|
g_free(group);
|
|
|
|
if (QLIST_EMPTY(&vfio_group_list)) {
|
|
qemu_unregister_reset(vfio_reset_handler, NULL);
|
|
}
|
|
}
|
|
|
|
int vfio_get_device(VFIOGroup *group, const char *name,
|
|
VFIODevice *vbasedev, Error **errp)
|
|
{
|
|
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
|
|
int ret, fd;
|
|
|
|
fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, errno, "error getting device from group %d",
|
|
group->groupid);
|
|
error_append_hint(errp,
|
|
"Verify all devices in group %d are bound to vfio-<bus> "
|
|
"or pci-stub and not already in use\n", group->groupid);
|
|
return fd;
|
|
}
|
|
|
|
ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
|
|
if (ret) {
|
|
error_setg_errno(errp, errno, "error getting device info");
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Set discarding of RAM as not broken for this group if the driver knows
|
|
* the device operates compatibly with discarding. Setting must be
|
|
* consistent per group, but since compatibility is really only possible
|
|
* with mdev currently, we expect singleton groups.
|
|
*/
|
|
if (vbasedev->ram_block_discard_allowed !=
|
|
group->ram_block_discard_allowed) {
|
|
if (!QLIST_EMPTY(&group->device_list)) {
|
|
error_setg(errp, "Inconsistent setting of support for discarding "
|
|
"RAM (e.g., balloon) within group");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
if (!group->ram_block_discard_allowed) {
|
|
group->ram_block_discard_allowed = true;
|
|
ram_block_discard_disable(false);
|
|
}
|
|
}
|
|
|
|
vbasedev->fd = fd;
|
|
vbasedev->group = group;
|
|
QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
|
|
|
|
vbasedev->num_irqs = dev_info.num_irqs;
|
|
vbasedev->num_regions = dev_info.num_regions;
|
|
vbasedev->flags = dev_info.flags;
|
|
|
|
trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
|
|
dev_info.num_irqs);
|
|
|
|
vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
|
|
return 0;
|
|
}
|
|
|
|
void vfio_put_base_device(VFIODevice *vbasedev)
|
|
{
|
|
if (!vbasedev->group) {
|
|
return;
|
|
}
|
|
QLIST_REMOVE(vbasedev, next);
|
|
vbasedev->group = NULL;
|
|
trace_vfio_put_base_device(vbasedev->fd);
|
|
close(vbasedev->fd);
|
|
}
|
|
|
|
int vfio_get_region_info(VFIODevice *vbasedev, int index,
|
|
struct vfio_region_info **info)
|
|
{
|
|
size_t argsz = sizeof(struct vfio_region_info);
|
|
|
|
*info = g_malloc0(argsz);
|
|
|
|
(*info)->index = index;
|
|
retry:
|
|
(*info)->argsz = argsz;
|
|
|
|
if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
|
|
g_free(*info);
|
|
*info = NULL;
|
|
return -errno;
|
|
}
|
|
|
|
if ((*info)->argsz > argsz) {
|
|
argsz = (*info)->argsz;
|
|
*info = g_realloc(*info, argsz);
|
|
|
|
goto retry;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
|
|
uint32_t subtype, struct vfio_region_info **info)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < vbasedev->num_regions; i++) {
|
|
struct vfio_info_cap_header *hdr;
|
|
struct vfio_region_info_cap_type *cap_type;
|
|
|
|
if (vfio_get_region_info(vbasedev, i, info)) {
|
|
continue;
|
|
}
|
|
|
|
hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
|
|
if (!hdr) {
|
|
g_free(*info);
|
|
continue;
|
|
}
|
|
|
|
cap_type = container_of(hdr, struct vfio_region_info_cap_type, header);
|
|
|
|
trace_vfio_get_dev_region(vbasedev->name, i,
|
|
cap_type->type, cap_type->subtype);
|
|
|
|
if (cap_type->type == type && cap_type->subtype == subtype) {
|
|
return 0;
|
|
}
|
|
|
|
g_free(*info);
|
|
}
|
|
|
|
*info = NULL;
|
|
return -ENODEV;
|
|
}
|
|
|
|
bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type)
|
|
{
|
|
struct vfio_region_info *info = NULL;
|
|
bool ret = false;
|
|
|
|
if (!vfio_get_region_info(vbasedev, region, &info)) {
|
|
if (vfio_get_region_info_cap(info, cap_type)) {
|
|
ret = true;
|
|
}
|
|
g_free(info);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Interfaces for IBM EEH (Enhanced Error Handling)
|
|
*/
|
|
static bool vfio_eeh_container_ok(VFIOContainer *container)
|
|
{
|
|
/*
|
|
* As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
|
|
* implementation is broken if there are multiple groups in a
|
|
* container. The hardware works in units of Partitionable
|
|
* Endpoints (== IOMMU groups) and the EEH operations naively
|
|
* iterate across all groups in the container, without any logic
|
|
* to make sure the groups have their state synchronized. For
|
|
* certain operations (ENABLE) that might be ok, until an error
|
|
* occurs, but for others (GET_STATE) it's clearly broken.
|
|
*/
|
|
|
|
/*
|
|
* XXX Once fixed kernels exist, test for them here
|
|
*/
|
|
|
|
if (QLIST_EMPTY(&container->group_list)) {
|
|
return false;
|
|
}
|
|
|
|
if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
|
|
{
|
|
struct vfio_eeh_pe_op pe_op = {
|
|
.argsz = sizeof(pe_op),
|
|
.op = op,
|
|
};
|
|
int ret;
|
|
|
|
if (!vfio_eeh_container_ok(container)) {
|
|
error_report("vfio/eeh: EEH_PE_OP 0x%x: "
|
|
"kernel requires a container with exactly one group", op);
|
|
return -EPERM;
|
|
}
|
|
|
|
ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
|
|
if (ret < 0) {
|
|
error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
|
|
return -errno;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
|
|
{
|
|
VFIOAddressSpace *space = vfio_get_address_space(as);
|
|
VFIOContainer *container = NULL;
|
|
|
|
if (QLIST_EMPTY(&space->containers)) {
|
|
/* No containers to act on */
|
|
goto out;
|
|
}
|
|
|
|
container = QLIST_FIRST(&space->containers);
|
|
|
|
if (QLIST_NEXT(container, next)) {
|
|
/* We don't yet have logic to synchronize EEH state across
|
|
* multiple containers */
|
|
container = NULL;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
vfio_put_address_space(space);
|
|
return container;
|
|
}
|
|
|
|
bool vfio_eeh_as_ok(AddressSpace *as)
|
|
{
|
|
VFIOContainer *container = vfio_eeh_as_container(as);
|
|
|
|
return (container != NULL) && vfio_eeh_container_ok(container);
|
|
}
|
|
|
|
int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
|
|
{
|
|
VFIOContainer *container = vfio_eeh_as_container(as);
|
|
|
|
if (!container) {
|
|
return -ENODEV;
|
|
}
|
|
return vfio_eeh_container_op(container, op);
|
|
}
|