From: Xiao Guangrong <xiaoguangrong.eric@gmail.com>
To: Haozhong Zhang <haozhong.zhang@intel.com>,
kvm@vger.kernel.org, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
rkrcmar@redhat.com, Dan Williams <dan.j.williams@intel.com>,
ivan.d.cuevas.escareno@intel.com, karthik.kumar@intel.com,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Olif Chapman <olif.chapman@oracle.com>,
Mikulas Patocka <mpatocka@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Borislav Petkov <bp@suse.de>,
Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH v5 0/2] KVM: MMU: fix kvm_is_mmio_pfn()
Date: Wed, 8 Nov 2017 17:19:26 +0800 [thread overview]
Message-ID: <f1b9f317-117b-5a40-02d1-c9367dfb4018@gmail.com> (raw)
In-Reply-To: <20171108075630.16991-1-haozhong.zhang@intel.com>
On 11/08/2017 03:56 PM, Haozhong Zhang wrote:
> 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 in addition and only treat
> UC/UC- pages as MMIO.
>
Reviewed-by: Xiao Guangrong <xiaoguangrong@tencent.com>
prev parent reply other threads:[~2017-11-08 9:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-08 7:56 Haozhong Zhang
2017-11-08 7:56 ` [PATCH v5 1/2] x86/mm: add a function to check if a pfn is UC/UC- Haozhong Zhang
2017-11-15 10:44 ` David Hildenbrand
2017-11-16 7:08 ` Haozhong Zhang
2017-11-15 15:17 ` Dan Williams
2017-11-16 6:13 ` Haozhong Zhang
2017-12-18 12:55 ` Paolo Bonzini
2017-12-19 2:40 ` Haozhong Zhang
2017-12-19 10:42 ` Paolo Bonzini
2017-11-08 7:56 ` [PATCH v5 2/2] KVM: MMU: consider host cache mode in MMIO page check Haozhong Zhang
2017-12-15 9:14 ` Paolo Bonzini
2017-11-08 9:19 ` Xiao Guangrong [this message]
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