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authorPaolo Bonzini <pbonzini@redhat.com>2021-02-03 14:18:28 +0100
committerMichael S. Tsirkin <mst@redhat.com>2021-02-05 08:52:58 -0500
commit08b1df8ff463e72b0875538fb991d5393047606c (patch)
treec9f9b9a66917481bd350eaa346bb51d29d252920 /hw
parent7c16b5bbb6c0f797945327d17e4be60f25a4427d (diff)
downloadqemu-arm-08b1df8ff463e72b0875538fb991d5393047606c.tar.gz
pci: add romsize property
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>
Diffstat (limited to 'hw')
-rw-r--r--hw/pci/pci.c19
-rw-r--r--hw/xen/xen_pt_load_rom.c14
2 files changed, 29 insertions, 4 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 58560c044d..a9ebef8a35 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -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);
diff --git a/hw/xen/xen_pt_load_rom.c b/hw/xen/xen_pt_load_rom.c
index a50a80837e..03422a8a71 100644
--- a/hw/xen/xen_pt_load_rom.c
+++ b/hw/xen/xen_pt_load_rom.c
@@ -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);