* [PATCH v4 1/1] pci: ROM preallocation for incoming migration
2023-05-22 20:17 [PATCH v4 0/1] ROM migration Vladimir Sementsov-Ogievskiy
@ 2023-05-22 20:17 ` Vladimir Sementsov-Ogievskiy
2023-06-09 13:32 ` [PATCH v4 0/1] ROM migration Vladimir Sementsov-Ogievskiy
1 sibling, 0 replies; 5+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2023-05-22 20:17 UTC (permalink / raw)
To: qemu-devel
Cc: mst, marcel.apfelbaum, philmd, david, peterx, pbonzini,
den-plotnikov, lersek, kraxel, dgilbert, quintela, armbru,
vsementsov
On incoming migration we have the following sequence to load option
ROM:
1. On device realize we do normal load ROM from the file
2. Than, on incoming migration we rewrite ROM from the incoming RAM
block. If sizes mismatch we fail, like this:
Size mismatch: 0000:00:03.0/virtio-net-pci.rom: 0x40000 != 0x80000: Invalid argument
This is not ideal when we migrate to updated distribution: we have to
keep old ROM files in new distribution and be careful around romfile
property to load correct ROM file. Which is loaded actually just to
allocate the ROM with correct length.
Note, that romsize property doesn't really help: if we try to specify
it when default romfile is larger, it fails with something like:
romfile "efi-virtio.rom" (160768 bytes) is too large for ROM size 65536
Let's just ignore ROM file when romsize is specified and we are in
incoming migration state. In other words, we need only to preallocate
ROM of specified size, local ROM file is unrelated.
This way:
If romsize was specified on source, we just use same commandline as on
source, and migration will work independently of local ROM files on
target.
If romsize was not specified on source (and we have mismatching local
ROM file on target host), we have to specify romsize on target to match
source romsize. romfile parameter may be kept same as on source or may
be dropped, the file is not loaded anyway.
As a bonus we avoid extra reading from ROM file on target.
Note: when we don't have romsize parameter on source command line and
need it for target, it may be calculated as aligned up to power of two
size of ROM file on source (if we know, which file is it) or,
alternatively it may be retrieved from source QEMU by QMP qom-get
command, like
{ "execute": "qom-get",
"arguments": {
"path": "/machine/peripheral/CARD_ID/virtio-net-pci.rom[0]",
"property": "size" } }
Note: we have extra initialization of size variable to zero in
pci_add_option_rom to avoid false-positive
"error: ‘size’ may be used uninitialized"
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
---
hw/pci/pci.c | 79 ++++++++++++++++++++++++++++++----------------------
1 file changed, 46 insertions(+), 33 deletions(-)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 1cc7c89036..a3840cc452 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -36,6 +36,7 @@
#include "migration/vmstate.h"
#include "net/net.h"
#include "sysemu/numa.h"
+#include "sysemu/runstate.h"
#include "sysemu/sysemu.h"
#include "hw/loader.h"
#include "qemu/error-report.h"
@@ -2308,12 +2309,18 @@ static void pci_patch_ids(PCIDevice *pdev, uint8_t *ptr, uint32_t size)
static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
Error **errp)
{
- int64_t size;
+ int64_t size = 0;
g_autofree char *path = NULL;
- void *ptr;
char name[32];
const VMStateDescription *vmsd;
+ /*
+ * In case of incoming migration ROM will come with migration stream, no
+ * reason to load the file. Neither we want to fail if local ROM file
+ * mismatches with specified romsize.
+ */
+ bool load_file = !runstate_check(RUN_STATE_INMIGRATE);
+
if (!pdev->romfile || !strlen(pdev->romfile)) {
return;
}
@@ -2343,32 +2350,35 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
return;
}
- path = qemu_find_file(QEMU_FILE_TYPE_BIOS, pdev->romfile);
- if (path == NULL) {
- path = g_strdup(pdev->romfile);
- }
+ if (load_file || pdev->romsize == -1) {
+ path = qemu_find_file(QEMU_FILE_TYPE_BIOS, pdev->romfile);
+ if (path == NULL) {
+ path = g_strdup(pdev->romfile);
+ }
- size = get_image_size(path);
- if (size < 0) {
- error_setg(errp, "failed to find romfile \"%s\"", pdev->romfile);
- return;
- } else if (size == 0) {
- error_setg(errp, "romfile \"%s\" is empty", pdev->romfile);
- return;
- } else if (size > 2 * GiB) {
- error_setg(errp, "romfile \"%s\" too large (size cannot exceed 2 GiB)",
- pdev->romfile);
- return;
- }
- 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);
+ size = get_image_size(path);
+ if (size < 0) {
+ error_setg(errp, "failed to find romfile \"%s\"", pdev->romfile);
+ return;
+ } else if (size == 0) {
+ error_setg(errp, "romfile \"%s\" is empty", pdev->romfile);
+ return;
+ } else if (size > 2 * GiB) {
+ error_setg(errp,
+ "romfile \"%s\" too large (size cannot exceed 2 GiB)",
+ pdev->romfile);
return;
}
- } else {
- pdev->romsize = 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);
+ return;
+ }
+ } else {
+ pdev->romsize = pow2ceil(size);
+ }
}
vmsd = qdev_get_vmsd(DEVICE(pdev));
@@ -2379,15 +2389,18 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
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);
- return;
- }
+ if (load_file) {
+ void *ptr = memory_region_get_ram_ptr(&pdev->rom);
- if (is_default_rom) {
- /* Only the default rom images will be patched (if needed). */
- pci_patch_ids(pdev, ptr, size);
+ if (load_image_size(path, ptr, size) < 0) {
+ error_setg(errp, "failed to load romfile \"%s\"", pdev->romfile);
+ return;
+ }
+
+ if (is_default_rom) {
+ /* Only the default rom images will be patched (if needed). */
+ pci_patch_ids(pdev, ptr, size);
+ }
}
pci_register_bar(pdev, PCI_ROM_SLOT, 0, &pdev->rom);
--
2.34.1
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