linux-kernel - [PATCH 0/2] KVM: VMX: Stub out enable

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Date:   Wed,  8 Feb 2023 20:54:28 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Tom Rix <trix@...hat.com>, kvm@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] KVM: VMX: Stub out enable_evmcs static key

Stub out the enable_evmcs static key for CONFIG_HYPERV=n.  gcc (as of
gcc-12) isn't clever enough to elide the nop placeholder when there's no
code guarded by a static branch.  With gcc-12, because of the vast number
of VMCS accesses, eliminating the nops reduces the size of kvm-intel.ko by
~7.5% (200KiB).

Patch 1 is tangentially related cleanup.

Applies on `git@...hub.com:kvm-x86/linux.git vmx`.

Sean Christopherson (2):
  KVM: nVMX: Move EVMCS1_SUPPORT_* macros to hyperv.c
  KVM: VMX: Stub out enable_evmcs static key for CONFIG_HYPERV=n

 arch/x86/kvm/vmx/hyperv.c  | 107 +++++++++++++++++++++++++++++++++-
 arch/x86/kvm/vmx/hyperv.h  | 115 +++----------------------------------
 arch/x86/kvm/vmx/vmx.c     |  15 +++--
 arch/x86/kvm/vmx/vmx_ops.h |  22 +++----
 4 files changed, 132 insertions(+), 127 deletions(-)


base-commit: 93827a0a36396f2fd6368a54a020f420c8916e9b
-- 
2.39.1.519.gcb327c4b5f-goog