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authorAlexis Dambricourt <alexis.dambricourt@gmail.com>2015-12-14 15:39:34 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2015-12-22 15:28:37 +0100
commita7f2d7865720ff13d5b0f2a3bb1fd80dc3d7a73f (patch)
treeeb056ec459bc3f15b8b4ce1c9c5ef1b5b3abffc0
parent6fd086214a32510b963d9662b034bfd16cfad2ba (diff)
downloadlinux-stericsson-a7f2d7865720ff13d5b0f2a3bb1fd80dc3d7a73f.tar.gz
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.c2
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;
}