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KVM: MTRR: fix fixed MTRR segment look up 

This fixes the slow-down of VM running with pci-passthrough, since some MTRR
range changed from MTRR_TYPE_WRBACK to MTRR_TYPE_UNCACHABLE.  Memory in the
0K-640K range was incorrectly treated as uncacheable.

Fixes: f7bfb57b3e
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107561
Cc: qemu-stable@nongnu.org
Signed-off-by: Alexis Dambricourt <alexis.dambricourt@gmail.com>
[Use correct BZ for "Fixes" annotation.  - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexis Dambricourt 2015-12-14 15:39:34 +01:00 committed by Paolo Bonzini
parent 6fd086214a
commit a7f2d78657
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mtrr.c
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@ -267,7 +267,7 @@ static int fixed_mtrr_addr_to_seg(u64 addr)
for (seg = 0; seg < seg_num; seg++) {
mtrr_seg = &fixed_seg_table[seg];
if (mtrr_seg->start >= addr && addr < mtrr_seg->end)
if (mtrr_seg->start <= addr && addr < mtrr_seg->end)
return seg;
}