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pci: add romsize property

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This property can be useful for distros to set up known-good ROM sizes for
migration purposes.  The VM will fail to start if the ROM is too large,
and migration compatibility will not be broken if the ROM is too small.

Note that even though romsize is a uint32_t, it has to be between 1
(because empty ROM files are not accepted, and romsize must be greater
than the file) and 2^31 (because values above are not powers of two and
are rejected).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20201218182736.1634344-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210203131828.156467-3-pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-02-03 14:18:28 +01:00 committed by Michael S. Tsirkin
parent 7c16b5bbb6
commit 08b1df8ff4
3 changed files with 30 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
hw/pci/pci.c
View File

@ -69,6 +69,7 @@ static void pcibus_reset(BusState *qbus);
static Property pci_props[] = {
DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1),
DEFINE_PROP_STRING("romfile", PCIDevice, romfile),
DEFINE_PROP_UINT32("romsize", PCIDevice, romsize, -1),
DEFINE_PROP_UINT32("rombar", PCIDevice, rom_bar, 1),
DEFINE_PROP_BIT("multifunction", PCIDevice, cap_present,
QEMU_PCI_CAP_MULTIFUNCTION_BITNR, false),
@ -2084,6 +2085,11 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
bool is_default_rom;
uint16_t class_id;
if (pci_dev->romsize != -1 && !is_power_of_2(pci_dev->romsize)) {
error_setg(errp, "ROM size %u is not a power of two", pci_dev->romsize);
return;
}
/* initialize cap_present for pci_is_express() and pci_config_size(),
* Note that hybrid PCIs are not set automatically and need to manage
* QEMU_PCI_CAP_EXPRESS manually */
@ -2349,7 +2355,16 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
g_free(path);
return;
}
size = pow2ceil(size);
if (pdev->romsize != -1) {
if (size > pdev->romsize) {
error_setg(errp, "romfile \"%s\" (%u bytes) is too large for ROM size %u",
pdev->romfile, (uint32_t)size, pdev->romsize);
g_free(path);
return;
}
} else {
pdev->romsize = pow2ceil(size);
}
vmsd = qdev_get_vmsd(DEVICE(pdev));
@ -2359,7 +2374,7 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
snprintf(name, sizeof(name), "%s.rom", object_get_typename(OBJECT(pdev)));
}
pdev->has_rom = true;
memory_region_init_rom(&pdev->rom, OBJECT(pdev), name, size, &error_fatal);
memory_region_init_rom(&pdev->rom, OBJECT(pdev), name, pdev->romsize, &error_fatal);
ptr = memory_region_get_ram_ptr(&pdev->rom);
if (load_image_size(path, ptr, size) < 0) {
error_setg(errp, "failed to load romfile \"%s\"", pdev->romfile);

14
hw/xen/xen_pt_load_rom.c
View File

@ -53,10 +53,20 @@ void *pci_assign_dev_load_option_rom(PCIDevice *dev,
}
fseek(fp, 0, SEEK_SET);
if (dev->romsize != -1) {
if (st.st_size > dev->romsize) {
error_report("ROM BAR \"%s\" (%ld bytes) is too large for ROM size %u",
rom_file, (long) st.st_size, dev->romsize);
goto close_rom;
}
} else {
dev->romsize = st.st_size;
}
snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort);
memory_region_init_ram(&dev->rom, owner, name, dev->romsize, &error_abort);
ptr = memory_region_get_ram_ptr(&dev->rom);
memset(ptr, 0xff, st.st_size);
memset(ptr, 0xff, dev->romsize);
if (!fread(ptr, 1, st.st_size, fp)) {
error_report("pci-assign: Cannot read from host %s", rom_file);

1
include/hw/pci/pci.h
View File

@ -344,6 +344,7 @@ struct PCIDevice {
/* Location of option rom */
char *romfile;
uint32_t romsize;
bool has_rom;
MemoryRegion rom;
uint32_t rom_bar;