linux-kernel - [PATCH v2 0/2] Cleanup VMFUNC handling in KVM.

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Date:   Wed,  9 Nov 2022 15:54:11 +0800
From:   Yu Zhang <yu.c.zhang@...ux.intel.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] Cleanup VMFUNC handling in KVM.

Since VMFUNC is not supported for non-nested guests, and executing VMFUNC
can cause a #UD directly, if the “enable VM functions” VM-execution control
is 0, KVM can just disable it in VM-exectution control, instead of taking
pains to trap it and emulate the #UD for L1 guests.

Also, simplified the process of setting SECONDARY_EXEC_ENABLE_VMFUNC for
nested VMX MSR configurations.

Change log:
==========
v1->v2
- Split the patch into two pieces.
- Use KVM_BUG_ON() for unexpected VM Exits.
- Comments changes.
- Commit message changes, trying to better illustrate the reason.

Yu Zhang (2):
  KVM: VMX: Do not trap VMFUNC instructions for L1 guests.
  KVM: nVMX: Simplify the setting of SECONDARY_EXEC_ENABLE_VMFUNC for
    nested.

 arch/x86/kvm/vmx/nested.c | 26 ++++++++++----------------
 arch/x86/kvm/vmx/vmx.c    |  7 ++++++-
 2 files changed, 16 insertions(+), 17 deletions(-)

-- 
2.17.1