From: Paolo Bonzini <pbonzini@redhat.com>
To: Tom Lendacky <thomas.lendacky@amd.com>,
Brijesh Singh <brijesh.singh@amd.com>,
kvm@vger.kernel.org
Cc: rkrcmar@redhat.com, joro@8bytes.org, x86@kernel.org,
linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com,
tglx@linutronix.de, bp@suse.de
Subject: Re: [PATCH v1 1/3] kvm: svm: Add support for additional SVM NPF error codes
Date: Tue, 22 Nov 2016 23:29:56 +0100 [thread overview]
Message-ID: <ecd1bbe1-70b8-32d3-e5a3-41af835bceba@redhat.com> (raw)
In-Reply-To: <c8927a04-3e09-2acf-8116-a61d25114043@amd.com>
On 22/11/2016 23:15, Tom Lendacky wrote:
> > 2) what bit is set if the processor is reading the PDPTEs of a 32-bit
> > PAE guest?
>
> I believe that bit 33 will be set. The PDPE's are considered guest
> tables and are read during a guest table walk (see APM vol2 section
> 15.25.10). Note that this is slightly different than the bare-metal
> behavior of legacy PAE mode as APM describes. I'll try to test this
> and verify it.
No big deal, indeed it's a bit different from Intel which caches the
four PDPEs, but it's enough to know that bit 33 will be set.
Paolo
next prev parent reply other threads:[~2016-11-22 22:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 22:15 [PATCH v1 0/3] x86: SVM: add additional SVM NPF error and use HW GPA Brijesh Singh
2016-11-14 22:15 ` [PATCH v1 1/3] kvm: svm: Add support for additional SVM NPF error codes Brijesh Singh
2016-11-21 15:12 ` Paolo Bonzini
2016-11-22 22:15 ` Tom Lendacky
2016-11-22 22:29 ` Paolo Bonzini [this message]
2016-11-14 22:15 ` [PATCH v1 2/3] kvm: svm: Add kvm_fast_pio_in support Brijesh Singh
2016-11-21 14:50 ` Paolo Bonzini
2016-11-22 14:25 ` Tom Lendacky
2016-11-22 15:12 ` Paolo Bonzini
2016-11-14 22:16 ` [PATCH v1 3/3] kvm: svm: Use the hardware provided GPA instead of page walk Brijesh Singh
2016-11-21 15:07 ` Paolo Bonzini
2016-11-22 14:13 ` Tom Lendacky
-- strict thread matches above, loose matches on Subject: below --
2016-11-14 22:04 [PATCH v1 0/3] x86: SVM: add additional SVM NPF error and use HW GPA Brijesh Singh
2016-11-14 22:04 ` [PATCH v1 1/3] kvm: svm: Add support for additional SVM NPF error codes Brijesh Singh
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