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From: Paolo Bonzini <pbonzini@redhat.com>
To: Jon Doron <arilou@gmail.com>,
	Roman Kagan <rvkagan@yandex-team.ru>,
	kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
	vkuznets@redhat.com
Subject: Re: [PATCH v11 2/7] x86/kvm/hyper-v: Simplify addition for custom cpuid leafs
Date: Fri, 29 May 2020 13:13:09 +0200
Message-ID: <df0a2749-ea11-43bb-bf5a-1c37bd931389@redhat.com> (raw)
In-Reply-To: <20200513124915.GM2862@jondnuc>

On 13/05/20 14:49, Jon Doron wrote:
>>
> 
> To be honest from my understanding of the TLFS it states:
> "The maximum input value for hypervisor CPUID information."
> 
> So we should not expose stuff we wont "answer" to, I agree you can
> always issue CPUID to any leaf and you will get zeroes but if we try to
> follow TLFS it sounds like this needs to be capped here.

I think Roman is right in the reading, but it's also nicer to have a
capped EAX because you can just look at EAX and guess what features are
there (it's simpler than looking for zeroes).

Paolo


  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-24 11:37 [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-04-24 11:37 ` [PATCH v11 1/7] x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit Jon Doron
2020-05-13  8:42   ` Roman Kagan
2020-04-24 11:37 ` [PATCH v11 2/7] x86/kvm/hyper-v: Simplify addition for custom cpuid leafs Jon Doron
2020-05-13  9:24   ` Roman Kagan
2020-05-13 12:49     ` Jon Doron
2020-05-29 11:13       ` Paolo Bonzini [this message]
2020-04-24 11:37 ` [PATCH v11 3/7] x86/hyper-v: Add synthetic debugger definitions Jon Doron
2020-04-24 11:37 ` [PATCH v11 4/7] x86/kvm/hyper-v: Add support for synthetic debugger capability Jon Doron
2020-05-29 10:46   ` Paolo Bonzini
2020-05-29 12:08     ` Vitaly Kuznetsov
2020-05-29 12:17       ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 5/7] x86/kvm/hyper-v: enable hypercalls without hypercall page with syndbg Jon Doron
2020-05-13  9:57   ` Roman Kagan
2020-05-13 12:37     ` Jon Doron
2020-05-29 10:48   ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 6/7] x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls Jon Doron
2020-05-12 15:33   ` Roman Kagan
2020-05-13 12:39     ` Jon Doron
2020-04-24 11:37 ` [PATCH v11 7/7] KVM: selftests: update hyperv_cpuid with SynDBG tests Jon Doron
2020-05-07  3:01 ` [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-05-07  7:57   ` Paolo Bonzini

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