linux-kernel - [PATCH v2 0/2] INVD intercept change to skip instruction

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Message-Id: <cover.1600972918.git.thomas.lendacky@amd.com>
Date:   Thu, 24 Sep 2020 13:41:56 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Brijesh Singh <brijesh.singh@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH v2 0/2] INVD intercept change to skip instruction

From: Tom Lendacky <thomas.lendacky@....com>

This series updates the INVD intercept support for both SVM and VMX to
skip the instruction rather than emulating it, since emulation of this
instruction is just a NOP.

For SVM, it requires creating a dedicated INVD intercept routine that
invokes kvm_skip_emulated_instruction(). The current support uses the
common emulate_on_interception() routine, which does not work for SEV
guests, and so a Fixes: tag is added.

For VMX, which already has a dedicated INVD intercept routine, it changes
kvm_emulate_instruction() into a call to kvm_skip_emulated_instruction().

Tom Lendacky (2):
  KVM: SVM: Add a dedicated INVD intercept routine
  KVM: VMX: Do not perform emulation for INVD intercept

 arch/x86/kvm/svm/svm.c | 8 +++++++-
 arch/x86/kvm/vmx/vmx.c | 3 ++-
 2 files changed, 9 insertions(+), 2 deletions(-)

-- 
2.28.0