projects / pve-kernel-jessie.git / blame
| Commit | Line | Data |
|---|---|---|
| 2b10ecdc AD |
1 | From a7f2d7865720ff13d5b0f2a3bb1fd80dc3d7a73f Mon Sep 17 00:00:00 2001 |
| 2 | From: Alexis Dambricourt <alexis.dambricourt@gmail.com> | |
| 3 | Date: Mon, 14 Dec 2015 15:39:34 +0100 | |
| 4 | Subject: KVM: MTRR: fix fixed MTRR segment look up | |
| 5 | ||
| 6 | This fixes the slow-down of VM running with pci-passthrough, since some MTRR | |
| 7 | range changed from MTRR_TYPE_WRBACK to MTRR_TYPE_UNCACHABLE. Memory in the | |
| 8 | 0K-640K range was incorrectly treated as uncacheable. | |
| 9 | ||
| 10 | Fixes: f7bfb57b3e89ff89c0da9f93dedab89f68d6ca27 | |
| 11 | Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107561 | |
| 12 | Cc: qemu-stable@nongnu.org | |
| 13 | Signed-off-by: Alexis Dambricourt <alexis.dambricourt@gmail.com> | |
| 14 | [Use correct BZ for "Fixes" annotation. - Paolo] | |
| 15 | Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | |
| 16 | --- | |
| 17 | arch/x86/kvm/mtrr.c | 2 +- | |
| 18 | 1 file changed, 1 insertion(+), 1 deletion(-) | |
| 19 | ||
| 20 | diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c | |
| 21 | index 9e8bf13..adc54e1 100644 | |
| 22 | --- a/arch/x86/kvm/mtrr.c | |
| 23 | +++ b/arch/x86/kvm/mtrr.c | |
| 24 | @@ -267,7 +267,7 @@ static int fixed_mtrr_addr_to_seg(u64 addr) | |
| 25 | ||
| 26 | for (seg = 0; seg < seg_num; seg++) { | |
| 27 | mtrr_seg = &fixed_seg_table[seg]; | |
| 28 | - if (mtrr_seg->start >= addr && addr < mtrr_seg->end) | |
| 29 | + if (mtrr_seg->start <= addr && addr < mtrr_seg->end) | |
| 30 | return seg; | |
| 31 | } | |
| 32 | ||
| 33 | -- | |
| 34 | cgit v0.11.2 |