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pci: fix corrupted pci conf index register by unaligned write

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Commit d0ed8076cb converted the PCI config access to the memory
API, but also inadvertantly changed it to accept unaligned writes,
and corrupt the index register in the process.  This causes a regression
booting NetBSD.

Fix by ignoring unaligned or non-dword writes.

https://bugs.launchpad.net/qemu/+bug/897771

Reported-by: Andreas Gustafsson <gson@gson.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Avi Kivity 2012-01-04 16:28:42 +02:00 committed by Michael S. Tsirkin
parent 54bfa546a0
commit cdde6ffc27
1 changed files with 3 additions and 0 deletions
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3
hw/pci_host.c
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@ -101,6 +101,9 @@ static void pci_host_config_write(void *opaque, target_phys_addr_t addr,
PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",
__func__, addr, len, val);
if (addr != 0 || len != 4) {
return;
}
s->config_reg = val;
}