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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


  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 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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