From: Santosh Shukla <santosh.shukla@amd.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
mlevitsk@redhat.com, mail@maciej.szmigiero.name
Subject: Re: [PATCHv4 0/8] Virtual NMI feature
Date: Sun, 16 Oct 2022 11:19:28 +0530 [thread overview]
Message-ID: <b76e36d0-88d5-be32-a9b2-e3d476e44556@amd.com> (raw)
In-Reply-To: <Y0Q/jVzFz3MoP26d@google.com>
On 10/10/2022 9:21 PM, Sean Christopherson wrote:
> On Mon, Oct 10, 2022, Santosh Shukla wrote:
>>
>>
>> On 10/7/2022 12:10 AM, Sean Christopherson wrote:
>>> On Mon, Aug 29, 2022, Santosh Shukla wrote:
>>>> If NMI virtualization enabled and NMI_INTERCEPT bit is unset
>>>> then HW will exit with #INVALID exit reason.
>>>>
>>>> To enable the VNMI capability, Hypervisor need to program
>>>> V_NMI_ENABLE bit 1.
>>>>
>>>> The presence of this feature is indicated via the CPUID function
>>>> 0x8000000A_EDX[25].
>>>
>>> Until there is publicly available documentation, I am not going to review this
>>> any further. This goes for all new features, e.g. PerfMonv2[*]. I understand
>>> the need and desire to get code merged far in advance of hardware being available,
>>> but y'all clearly have specs, i.e. this is a very solvable problem. Throw all the
>>> disclaimers you want on the specs to make it abundantly clear that they are for
>>> preview purposes or whatever, but reviewing KVM code without a spec just doesn't
>>> work for me.
>>>
>>
>> Sure Sean.
>>
>> I am told that the APM should be out in the next couple of weeks.
>
> Probably too late to be of much value for virtual NMI support, but for future
> features, it would be very helpful to release "preview" documentation ASAP so that
> we don't have to wait for the next APM update, which IIUC only happens ~2 times a
> year.
Virtual NMI spec is at [1], Chapter - 15.21.10 NMI Virtualization.
Thanks,
Santosh
[1] https://www.amd.com/en/support/tech-docs/amd64-architecture-programmers-manual-volumes-1-5
prev parent reply other threads:[~2022-10-16 5:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-29 10:08 [PATCHv4 0/8] Virtual NMI feature Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 1/8] x86/cpu: Add CPUID feature bit for VNMI Santosh Shukla
2022-08-31 23:42 ` Jim Mattson
2022-09-01 12:45 ` Shukla, Santosh
2022-09-01 17:43 ` Jim Mattson
2022-09-05 7:49 ` Shukla, Santosh
2022-08-29 10:08 ` [PATCHv4 2/8] KVM: SVM: Add VNMI bit definition Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 3/8] KVM: SVM: Add VNMI support in get/set_nmi_mask Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 4/8] KVM: SVM: Report NMI not allowed when Guest busy handling VNMI Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 5/8] KVM: SVM: Add VNMI support in inject_nmi Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 6/8] KVM: nSVM: implement nested VNMI Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 7/8] KVM: nSVM: emulate VMEXIT_INVALID case for " Santosh Shukla
2022-08-29 10:08 ` [PATCHv4 8/8] KVM: SVM: Enable VNMI feature Santosh Shukla
2022-10-06 18:40 ` [PATCHv4 0/8] Virtual NMI feature Sean Christopherson
2022-10-10 5:46 ` Santosh Shukla
2022-10-10 15:51 ` Sean Christopherson
2022-10-16 5:49 ` Santosh Shukla [this message]
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