From: Paolo Bonzini <pbonzini@redhat.com>
To: Haozhong Zhang <haozhong.zhang@intel.com>,
kvm@vger.kernel.org, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, rkrcmar@redhat.com,
Xiao Guangrong <xiaoguangrong.eric@gmail.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 1/2] x86/mm: add a function to check if a pfn is UC/UC-
Date: Mon, 18 Dec 2017 13:55:30 +0100 [thread overview]
Message-ID: <2da7d38c-8135-a722-8d93-f3d1a618b12e@redhat.com> (raw)
In-Reply-To: <20171108075630.16991-2-haozhong.zhang@intel.com>
On 08/11/2017 08:56, Haozhong Zhang wrote:
> +bool pat_pfn_is_uc_or_uc_minus(unsigned long pfn)
> +{
> + enum page_cache_mode cm = lookup_memtype(PFN_PHYS(pfn));
> +
> + return cm == _PAGE_CACHE_MODE_UC || cm == _PAGE_CACHE_MODE_UC_MINUS;
> +}
> +EXPORT_SYMBOL_GPL(pat_pfn_is_uc_or_uc_minus);
> +
As discussed in the reply to v2, this should include WC too. The
function name could become something like pat_pfn_downgraded_by_uc_mtrr.
Thanks,
Paolo
next prev parent reply other threads:[~2017-12-18 12:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-08 7:56 [PATCH v5 0/2] KVM: MMU: fix kvm_is_mmio_pfn() 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 [this message]
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 ` [PATCH v5 0/2] KVM: MMU: fix kvm_is_mmio_pfn() Xiao Guangrong
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