linux-kernel - Re: [PATCH] KVM: SVM: Explicitly require FLUSHBYASID to enable SEV support

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Message-ID: <170137748399.663624.5891433313552244274.b4-ty@google.com>
Date:   Thu, 30 Nov 2023 17:52:28 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH] KVM: SVM: Explicitly require FLUSHBYASID to enable SEV support

On Wed, 18 Oct 2023 12:36:17 -0700, Sean Christopherson wrote:
> Add a sanity check that FLUSHBYASID is available if SEV is supported in
> hardware, as SEV (and beyond) guests are bound to a single ASID, i.e. KVM
> can't "flush" by assigning a new, fresh ASID to the guest.  If FLUSHBYASID
> isn't supported for some bizarre reason, KVM would completely fail to do
> TLB flushes for SEV+ guests (see pre_svm_run() and pre_sev_run()).
> 
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/1] KVM: SVM: Explicitly require FLUSHBYASID to enable SEV support
      https://github.com/kvm-x86/linux/commit/770d6aa2e416

--
https://github.com/kvm-x86/linux/tree/next