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From: Paolo Bonzini <pbonzini@redhat.com>
To: Yosry Ahmed <yosry@kernel.org>, Sean Christopherson <seanjc@google.com>
Cc: Jim Mattson <jmattson@google.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/7] KVM: SVM: Drop RAX check for SVM instructions from the emulator
Date: Sun, 15 Mar 2026 13:55:12 +0100	[thread overview]
Message-ID: <181d8563-14a2-4429-9e18-ede7a6aeb030@redhat.com> (raw)
In-Reply-To: <20260313001024.136619-2-yosry@kernel.org>

On 3/13/26 01:10, Yosry Ahmed wrote:
> Outside of forced emulation or code stream rewriting,

But isn't that the point? Due to code stream rewriting or intentional 
usage of stale TLBs (so that the processor executes one instruction and 
the emulator another), the emulator cannot assume that it will "never be 
invoked with an actually illegal RAX".

I realize that I'm late to the show, so I apologize in advance if this 
has been discussed before.

Paolo


  reply	other threads:[~2026-03-15 12:55 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-13  0:10 [PATCH v3 0/7] KVM: SVM: Fixes for VMCB12 checks and mapping Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 1/7] KVM: SVM: Drop RAX check for SVM instructions from the emulator Yosry Ahmed
2026-03-15 12:55   ` Paolo Bonzini [this message]
2026-03-16 13:49     ` Yosry Ahmed
2026-03-16 16:28       ` Yosry Ahmed
2026-03-17 13:15       ` Paolo Bonzini
2026-03-17 14:58         ` Jim Mattson
2026-03-18 15:55           ` Paolo Bonzini
2026-03-13  0:10 ` [PATCH v3 2/7] KVM: SVM: Check that RAX has legal GPA on #GP interception of SVM insns Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 3/7] KVM: SVM: Move RAX legality check to SVM insn interception handlers Yosry Ahmed
2026-03-13 18:17   ` Yosry Ahmed
2026-03-13 22:44     ` Sean Christopherson
2026-03-13 23:08       ` Yosry Ahmed
2026-03-16 15:25     ` Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 4/7] KVM: SVM: Treat mapping failures equally in VMLOAD/VMSAVE emulation Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 5/7] KVM: nSVM: Fail emulation of VMRUN/VMLOAD/VMSAVE if mapping vmcb12 fails Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 6/7] KVM: selftests: Rework svm_nested_invalid_vmcb12_gpa Yosry Ahmed
2026-03-13  0:10 ` [PATCH v3 7/7] KVM: selftests: Drop 'invalid' from svm_nested_invalid_vmcb12_gpa's name Yosry Ahmed

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