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Date: Thu, 2 Nov 2017 13:37:48 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: Haozhong Zhang <haozhong.zhang@...el.com>, Olif Chapman <olif.chapman@...cle.com> Cc: kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>, rkrcmar@...hat.com, Xiao Guangrong <xiaoguangrong.eric@...il.com>, Dan Williams <dan.j.williams@...el.com>, ivan.d.cuevas.escareno@...el.com, karthik.kumar@...el.com, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>, Mikulas Patocka <mpatocka@...hat.com>, Tom Lendacky <thomas.lendacky@....com> Subject: Re: [PATCH v2 0/2] KVM: MMU: fix kvm_is_mmio_pfn() On Tue, Oct 31, 2017 at 07:48:38PM +0800, Haozhong Zhang wrote: > [I just copy the commit message from patch 2] > > Some reserved pages, such as those from NVDIMM DAX devices, are > not for MMIO, and can be mapped with cached memory type for better > performance. However, the above check misconceives those pages as > MMIO. Because KVM maps MMIO pages with UC memory type, the > performance of guest accesses to those pages would be harmed. > Therefore, we check the host memory type by lookup_memtype() in > addition and only treat UC/UC- pages as MMIO. Is there a specific workload you used to detect this? Thanks! > > Changes in v2: > * Switch to lookup_memtype() to get host memory type. > * Rewrite the comment in KVM MMU patch. > * Remove v1 patch 2, which is not necessary in v2. > > Haozhong Zhang (2): > x86/mm: expose lookup_memtype() > KVM: MMU: consider host cache mode in MMIO page check > > arch/x86/include/asm/pat.h | 2 ++ > arch/x86/kvm/mmu.c | 30 +++++++++++++++++++++++++++--- > arch/x86/mm/pat.c | 3 ++- > 3 files changed, 31 insertions(+), 4 deletions(-) > > -- > 2.14.1 >
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