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2d6d60a3d3
If the "etc/vmcoreinfo" fw_cfg file is present and we are not running the kdump kernel, write the addr/size of the vmcoreinfo ELF note. The DMA operation is expected to run synchronously with today qemu, but the specification states that it may become async, so we run "control" field check in a loop for eventual changes. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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#ifndef _LINUX_FW_CFG_H
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#define _LINUX_FW_CFG_H
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#include <linux/types.h>
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#define FW_CFG_ACPI_DEVICE_ID "QEMU0002"
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/* selector key values for "well-known" fw_cfg entries */
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#define FW_CFG_SIGNATURE 0x00
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#define FW_CFG_ID 0x01
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#define FW_CFG_UUID 0x02
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#define FW_CFG_RAM_SIZE 0x03
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#define FW_CFG_NOGRAPHIC 0x04
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#define FW_CFG_NB_CPUS 0x05
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#define FW_CFG_MACHINE_ID 0x06
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#define FW_CFG_KERNEL_ADDR 0x07
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#define FW_CFG_KERNEL_SIZE 0x08
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#define FW_CFG_KERNEL_CMDLINE 0x09
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#define FW_CFG_INITRD_ADDR 0x0a
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#define FW_CFG_INITRD_SIZE 0x0b
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#define FW_CFG_BOOT_DEVICE 0x0c
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#define FW_CFG_NUMA 0x0d
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#define FW_CFG_BOOT_MENU 0x0e
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#define FW_CFG_MAX_CPUS 0x0f
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#define FW_CFG_KERNEL_ENTRY 0x10
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#define FW_CFG_KERNEL_DATA 0x11
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#define FW_CFG_INITRD_DATA 0x12
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#define FW_CFG_CMDLINE_ADDR 0x13
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#define FW_CFG_CMDLINE_SIZE 0x14
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#define FW_CFG_CMDLINE_DATA 0x15
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#define FW_CFG_SETUP_ADDR 0x16
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#define FW_CFG_SETUP_SIZE 0x17
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#define FW_CFG_SETUP_DATA 0x18
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#define FW_CFG_FILE_DIR 0x19
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#define FW_CFG_FILE_FIRST 0x20
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#define FW_CFG_FILE_SLOTS_MIN 0x10
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#define FW_CFG_WRITE_CHANNEL 0x4000
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#define FW_CFG_ARCH_LOCAL 0x8000
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#define FW_CFG_ENTRY_MASK (~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL))
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#define FW_CFG_INVALID 0xffff
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/* width in bytes of fw_cfg control register */
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#define FW_CFG_CTL_SIZE 0x02
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/* fw_cfg "file name" is up to 56 characters (including terminating nul) */
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#define FW_CFG_MAX_FILE_PATH 56
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/* size in bytes of fw_cfg signature */
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#define FW_CFG_SIG_SIZE 4
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/* FW_CFG_ID bits */
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#define FW_CFG_VERSION 0x01
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#define FW_CFG_VERSION_DMA 0x02
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/* fw_cfg file directory entry type */
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struct fw_cfg_file {
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__be32 size;
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__be16 select;
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__u16 reserved;
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char name[FW_CFG_MAX_FILE_PATH];
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};
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/* FW_CFG_DMA_CONTROL bits */
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#define FW_CFG_DMA_CTL_ERROR 0x01
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#define FW_CFG_DMA_CTL_READ 0x02
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#define FW_CFG_DMA_CTL_SKIP 0x04
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#define FW_CFG_DMA_CTL_SELECT 0x08
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#define FW_CFG_DMA_CTL_WRITE 0x10
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#define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */
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/* Control as first field allows for different structures selected by this
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* field, which might be useful in the future
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*/
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struct fw_cfg_dma_access {
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__be32 control;
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__be32 length;
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__be64 address;
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};
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#define FW_CFG_VMCOREINFO_FILENAME "etc/vmcoreinfo"
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#define FW_CFG_VMCOREINFO_FORMAT_NONE 0x0
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#define FW_CFG_VMCOREINFO_FORMAT_ELF 0x1
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struct fw_cfg_vmcoreinfo {
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__le16 host_format;
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__le16 guest_format;
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__le32 size;
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__le64 paddr;
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};
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#endif
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