On 14/12/2015 17:06, Alexis D...t wrote: > From what I see in my case, it was especially gfn from 0x0 to 0xA0 > which are deadly impacted by the wrong cache property.
Yes, indeed. I'll send the patch to Linus this week; I've now posted to the BZ a second patch for GFNs above 4GB. Paolo > 2015-12-14 16:36 GMT+01:00 Paolo Bonzini <pbonz...@redhat.com>: >> > >> > >> > On 14/12/2015 15:39, Alexis D...t wrote: >>> >> 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.dambrico...@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) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html