linux-kernel - [PATCH 0/3] KVM: MMU: fix kvm_is_mmio

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Message-Id: <20171027022524.22589-1-haozhong.zhang@intel.com>
Date:   Fri, 27 Oct 2017 10:25:21 +0800
From:   Haozhong Zhang <haozhong.zhang@...el.com>
To:     kvm@...r.kernel.org, x86@...nel.org
Cc:     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,
        Haozhong Zhang <haozhong.zhang@...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: [PATCH 0/3] KVM: MMU: fix kvm_is_mmio_pfn()

[I just copy the commit message from patch 3]

By default, KVM treats a reserved page as for MMIO purpose, and maps
it to guest with UC memory type.  However, some reserved pages are not
for MMIO, such as pages of DAX device (e.g., /dev/daxX.Y). Mapping
them with UC memory type will harm the performance.  In order to
exclude those cases, we check the host cache mode in addition and only
treat UC/UC- pages as MMIO.

Haozhong Zhang (3):
  x86/mm: expose track_pfn_insert()
  KVM: add converters between pfn_t and kvm_pfn_t
  KVM: MMU: consider host cache type in MMIO pfn check

 arch/x86/kvm/mmu.c       | 32 +++++++++++++++++++++++++++++---
 arch/x86/mm/pat.c        |  1 +
 include/linux/kvm_host.h |  3 +++
 3 files changed, 33 insertions(+), 3 deletions(-)

-- 
2.14.1