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From: "Alexis D...t" <alexis.dambricourt@gmail.com>
To: pbonzini@redhat.com
Cc: kvm@vger.kernel.org
Subject: [PATCH] KVM: MTRR: fix fixed MTRR segment look up
Date: Mon, 14 Dec 2015 15:39:34 +0100	[thread overview]
Message-ID: <CAG0+HugZfEmVcBBZucgrHjBTJon7igm-i+=rHbTh0Wu+Ru-g_g@mail.gmail.com> (raw)

It fixes the slow-down of VM running with pci-passthrough, since some MTRR
range changed from MTRR_TYPE_WRBACK to MTRR_TYPE_UNCACHABLE.

Fixes: fa61213746a ("KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type")
Bugzilla: (https://bugzilla.kernel.org/show_bug.cgi?id=107561)

Signed-off-by: Alexis Dambricourt <alexis.dambricourt@gmail.com>
---
 arch/x86/kvm/mtrr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 9e8bf13..adc54e1 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;
        }

--

             reply	other threads:[~2015-12-14 14:39 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-14 14:39 Alexis D...t [this message]
2015-12-14 15:36 ` [PATCH] KVM: MTRR: fix fixed MTRR segment look up Paolo Bonzini
2015-12-14 16:06   ` Alexis D...t
2015-12-14 16:07     ` Paolo Bonzini

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