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qxl: don't assert() if device isn't yet initialized

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If the PCI BAR isn't yet mapped or was unmapped, QXL_IO_SET_MODE will
assert(). Instead, report a guest bug and keep going.

This can be reproduced with:

cat << EOF | ./qemu-system-x86_64 -vga qxl -m 2048 -nodefaults -qtest stdio
outl 0xcf8 0x8000101c
outl 0xcfc 0xc000
outl 0xcf8 0x80001001
outl 0xcfc 0x01000000
outl 0xc006 0x00
EOF

Fixes: https://gitlab.com/qemu-project/qemu/-/issues/1829

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Marc-André Lureau 2023-08-14 23:33:30 +04:00 committed by Michael Tokarev
parent 90a0778421
commit 95bef686e4
1 changed files with 4 additions and 1 deletions
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5
hw/display/qxl.c
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@ -1591,7 +1591,10 @@ static void qxl_set_mode(PCIQXLDevice *d, unsigned int modenr, int loadvm)
}
d->guest_slots[0].slot = slot;
assert(qxl_add_memslot(d, 0, devmem, QXL_SYNC) == 0);
if (qxl_add_memslot(d, 0, devmem, QXL_SYNC) != 0) {
qxl_set_guest_bug(d, "device isn't initialized yet");
return;
}
d->guest_primary.surface = surface;
qxl_create_guest_primary(d, 0, QXL_SYNC);