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From: Borislav Petkov <bp@alien8.de>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Piotr Luc <Piotr.Luc@intel.com>,
	kvm@vger.kernel.org, he chen <he.chen@linux.intel.com>,
	linux-kernel@vger.kernel.org, tglx@linutronix.de, x86@kernel.org,
	hpa@zytor.com, mingo@redhat.com,
	Luwei Kang <luwei.kang@intel.com>,
	rkrcmar@redhat.com
Subject: Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest
Date: Sat, 29 Oct 2016 14:25:48 +0200	[thread overview]
Message-ID: <20161029122548.niyvh2q3kuvyqwo3@pd.tnic> (raw)
In-Reply-To: <425702906.9319122.1477743677017.JavaMail.zimbra@redhat.com>

On Sat, Oct 29, 2016 at 08:21:17AM -0400, Paolo Bonzini wrote:
> Currently none of the bits in CPUID[7,0].edx is ever masked by the host, so
> this would be enough.  If we ever need to do some masking, I guess I'll
> practice my puss-in-boots look and submit a patch to add CPUID[7,0] back
> as a separate cpufeature entr.

I don't understand - why can't it be filtered here if needed? I.e.,

	return edx & KVM_CPUID_EDX_7_MASK;

or so?

Btw, we already have a cpuid_edx() helper in arch/x86/include/asm/processor.h

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

  reply	other threads:[~2016-10-29 12:25 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-28  9:12 [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest He Chen
2016-10-28  9:31 ` Paolo Bonzini
2016-10-28  9:46   ` He Chen
2016-10-28  9:54     ` Paolo Bonzini
2016-10-28  9:55       ` He Chen
2016-10-28 10:13 ` Luc, Piotr
2016-10-28 10:17   ` Paolo Bonzini
2016-10-28 11:08     ` Borislav Petkov
2016-10-28 12:07       ` Paolo Bonzini
2016-10-28 12:21         ` Borislav Petkov
2016-10-29 12:21           ` Paolo Bonzini
2016-10-29 12:25             ` Borislav Petkov [this message]
2016-10-29 12:36               ` Paolo Bonzini
2016-10-29 12:53                 ` Borislav Petkov
2016-10-29 13:20                   ` Paolo Bonzini
2016-10-31  9:15             ` Luc, Piotr
2016-10-31  9:53               ` Borislav Petkov
2016-10-31 10:18                 ` Luc, Piotr
2016-10-31 10:30                   ` Borislav Petkov
2016-10-31 10:47                     ` Paolo Bonzini
2016-10-31 11:05                       ` Borislav Petkov
2016-10-31 11:41                         ` Paolo Bonzini
2016-11-01  7:48                           ` He Chen
2016-11-01  8:46                             ` Borislav Petkov

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