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 [thread overview]
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
next prev parent reply other threads:[~2020-05-29 11:13 UTC|newest]
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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