From: Paolo Bonzini <pbonzini@redhat.com>
To: "Denis V. Lunev" <den@openvz.org>,
Sean Christopherson <seanjc@google.com>,
Valeriy Vdovin <valeriy.vdovin@virtuozzo.com>
Cc: linux-kernel@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Shuah Khan <shuah@kernel.org>,
Aaron Lewis <aaronlewis@google.com>,
Alexander Graf <graf@amazon.com>,
Andrew Jones <drjones@redhat.com>,
Oliver Upton <oupton@google.com>,
Like Xu <like.xu@linux.intel.com>,
kvm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4] KVM: x86: Fix KVM_GET_CPUID2 ioctl to return cpuid entries count
Date: Tue, 4 May 2021 10:21:47 +0200 [thread overview]
Message-ID: <514b5373-c07b-ad34-5fba-f8850faf6d68@redhat.com> (raw)
In-Reply-To: <048b3f3a-379d-cff3-20b6-fc74dd12a98f@openvz.org>
On 04/05/21 10:15, Denis V. Lunev wrote:
> As far as I understand only some testing within kernel now.
> Though we have plans to expose it for QAPI as the series
> in QEMU
> [PATCH 1/2] qapi: fix error handling for x-vz-query-cpu-model-cpuid
> [PATCH 2/2] qapi: blacklisted x-vz-query-cpu-model-cpuid in tests
> is not coming in a good way.
> The idea was to avoid manual code rework in QEMU and
> expose collected model at least for debug.
KVM_GET_CPUID2 as a VM ioctl cannot expose the whole truth about CPUID
either, since it doesn't handle the TSX_CTRL_CPUID_CLEAR bit. Given
that QEMU doesn't need KVM_GET_CPUID2; it only needs to save whatever it
passed to KVM_SET_CPUID2.
Paolo
next prev parent reply other threads:[~2021-05-04 8:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 17:27 [PATCH v4] KVM: x86: Fix KVM_GET_CPUID2 ioctl to return cpuid entries count Valeriy Vdovin
2021-04-29 1:00 ` Sean Christopherson
2021-05-03 14:54 ` Paolo Bonzini
2021-05-03 19:18 ` Denis V. Lunev
2021-05-04 7:23 ` Paolo Bonzini
2021-05-04 8:15 ` Denis V. Lunev
2021-05-04 8:21 ` Paolo Bonzini [this message]
2021-05-04 9:26 ` Alexander Graf
2021-05-04 9:50 ` Paolo Bonzini
2021-05-04 16:52 ` Jim Mattson
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