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| author | Alexis Dambricourt <alexis.dambricourt@gmail.com> | 2015-12-14 17:39:34 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-12-22 17:28:37 +0300 |
| commit | a7f2d7865720ff13d5b0f2a3bb1fd80dc3d7a73f (patch) | |
| tree | eb056ec459bc3f15b8b4ce1c9c5ef1b5b3abffc0 | |
| parent | 6fd086214a32510b963d9662b034bfd16cfad2ba (diff) | |
| download | linux-a7f2d7865720ff13d5b0f2a3bb1fd80dc3d7a73f.tar.xz | |
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: f7bfb57b3e89ff89c0da9f93dedab89f68d6ca27
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>
| -rw-r--r-- | arch/x86/kvm/mtrr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c index 9e8bf13572e6..adc54e1d40a9 100644 --- a/arch/x86/kvm/mtrr.c +++ b/arch/x86/kvm/mtrr.c @@ -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; } |