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qxl: add migration blocker to avoid pre-save assert 

Cc: 1635339@bugs.launchpad.net
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20170410113131.2585-1-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-04-10 13:31:31 +02:00
parent a703d3aef5
commit 86dbcdd9c7
2 changed files with 32 additions and 0 deletions
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31
hw/display/qxl.c
View File

@ -26,6 +26,7 @@
#include "qemu/queue.h"
#include "qemu/atomic.h"
#include "sysemu/sysemu.h"
#include "migration/migration.h"
#include "trace.h"
#include "qxl.h"
@ -639,6 +640,30 @@ static int interface_get_command(QXLInstance *sin, struct QXLCommandExt *ext)
qxl->guest_primary.commands++;
qxl_track_command(qxl, ext);
qxl_log_command(qxl, "cmd", ext);
{
/*
* Windows 8 drivers place qxl commands in the vram
* (instead of the ram) bar. We can't live migrate such a
* guest, so add a migration blocker in case we detect
* this, to avoid triggering the assert in pre_save().
*
* https://cgit.freedesktop.org/spice/win32/qxl-wddm-dod/commit/?id=f6e099db39e7d0787f294d5fd0dce328b5210faa
*/
void *msg = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id);
if (msg != NULL && (
msg < (void *)qxl->vga.vram_ptr ||
msg > ((void *)qxl->vga.vram_ptr + qxl->vga.vram_size))) {
if (!qxl->migration_blocker) {
Error *local_err = NULL;
error_setg(&qxl->migration_blocker,
"qxl: guest bug: command not in ram bar");
migrate_add_blocker(qxl->migration_blocker, &local_err);
if (local_err) {
error_report_err(local_err);
}
}
}
}
trace_qxl_ring_command_get(qxl->id, qxl_mode_to_string(qxl->mode));
return true;
default:
@ -1236,6 +1261,12 @@ static void qxl_hard_reset(PCIQXLDevice *d, int loadvm)
qemu_spice_create_host_memslot(&d->ssd);
qxl_soft_reset(d);
if (d->migration_blocker) {
migrate_del_blocker(d->migration_blocker);
error_free(d->migration_blocker);
d->migration_blocker = NULL;
}
if (startstop) {
qemu_spice_display_start();
}

1
hw/display/qxl.h
View File

@ -40,6 +40,7 @@ typedef struct PCIQXLDevice {
uint32_t cmdlog;
uint32_t guest_bug;
Error *migration_blocker;
enum qxl_mode mode;
uint32_t cmdflags;