From: Wei Liu <wei.liu@kernel.org>
To: Vineeth Pillai <viremana@linux.microsoft.com>
Cc: Lan Tianyu <Tianyu.Lan@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Wei Liu <wei.liu@kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"K. Y. Srinivasan" <kys@microsoft.com>,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: Re: [PATCH v4 1/7] hyperv: Detect Nested virtualization support for SVM
Date: Wed, 28 Apr 2021 14:01:56 +0000 [thread overview]
Message-ID: <20210428140156.flf5ie6r2j7os5ch@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <8ffa88e6ceb55d283c76b4c5fd9ad0fb1a2cf667.1619556430.git.viremana@linux.microsoft.com>
On Tue, Apr 27, 2021 at 08:54:50PM +0000, Vineeth Pillai wrote:
> Previously, to detect nested virtualization enlightenment support,
> we were using HV_X64_ENLIGHTENED_VMCS_RECOMMENDED feature bit of
> HYPERV_CPUID_ENLIGHTMENT_INFO.EAX CPUID as docuemented in TLFS:
> "Bit 14: Recommend a nested hypervisor using the enlightened VMCS
> interface. Also indicates that additional nested enlightenments
> may be available (see leaf 0x4000000A)".
>
> Enlightened VMCS, however, is an Intel only feature so the above
> detection method doesn't work for AMD. So, use the
> HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS.EAX CPUID information ("The
> maximum input value for hypervisor CPUID information.") and this
> works for both AMD and Intel.
>
> Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
next prev parent reply other threads:[~2021-04-28 14:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-27 20:54 [PATCH v4 0/7] Hyper-V nested virt enlightenments for SVM Vineeth Pillai
2021-04-27 20:54 ` [PATCH v4 1/7] hyperv: Detect Nested virtualization support " Vineeth Pillai
2021-04-28 14:01 ` Wei Liu [this message]
2021-04-27 20:54 ` [PATCH v4 2/7] hyperv: SVM enlightened TLB flush support flag Vineeth Pillai
2021-04-28 13:47 ` Wei Liu
2021-04-27 20:54 ` [PATCH v4 3/7] KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx Vineeth Pillai
2021-04-27 20:54 ` [PATCH v4 4/7] KVM: SVM: Software reserved fields Vineeth Pillai
2021-04-27 20:54 ` [PATCH v4 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM Vineeth Pillai
2021-04-27 20:54 ` [PATCH v4 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support Vineeth Pillai
2021-04-27 20:54 ` [PATCH v4 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support Vineeth Pillai
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