diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0033-KVM-VMX-Optimize-vmx_vcpu_run-and-svm_vcpu_run-by-ma.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0033-KVM-VMX-Optimize-vmx_vcpu_run-and-svm_vcpu_run-by-ma.patch | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0033-KVM-VMX-Optimize-vmx_vcpu_run-and-svm_vcpu_run-by-ma.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0033-KVM-VMX-Optimize-vmx_vcpu_run-and-svm_vcpu_run-by-ma.patch deleted file mode 100644 index 95086730..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0033-KVM-VMX-Optimize-vmx_vcpu_run-and-svm_vcpu_run-by-ma.patch +++ /dev/null @@ -1,65 +0,0 @@ -From 885a241a441e144391884136534657f8502b2a48 Mon Sep 17 00:00:00 2001 -From: Paolo Bonzini <pbonzini@redhat.com> -Date: Thu, 22 Feb 2018 16:43:18 +0100 -Subject: [PATCH 33/33] KVM/VMX: Optimize vmx_vcpu_run() and svm_vcpu_run() by - marking the RDMSR path as unlikely() -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -commit 946fbbc13dce68902f64515b610eeb2a6c3d7a64 upstream. - -vmx_vcpu_run() and svm_vcpu_run() are large functions, and giving -branch hints to the compiler can actually make a substantial cycle -difference by keeping the fast path contiguous in memory. - -With this optimization, the retpoline-guest/retpoline-host case is -about 50 cycles faster. - -Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> -Reviewed-by: Jim Mattson <jmattson@google.com> -Cc: David Woodhouse <dwmw@amazon.co.uk> -Cc: KarimAllah Ahmed <karahmed@amazon.de> -Cc: Linus Torvalds <torvalds@linux-foundation.org> -Cc: Peter Zijlstra <peterz@infradead.org> -Cc: Radim Krčmář <rkrcmar@redhat.com> -Cc: Thomas Gleixner <tglx@linutronix.de> -Cc: kvm@vger.kernel.org -Cc: stable@vger.kernel.org -Link: http://lkml.kernel.org/r/20180222154318.20361-3-pbonzini@redhat.com -Signed-off-by: Ingo Molnar <mingo@kernel.org> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/kvm/svm.c | 2 +- - arch/x86/kvm/vmx.c | 2 +- - 2 files changed, 2 insertions(+), 2 deletions(-) - -diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c -index 8d33396..b82bb66 100644 ---- a/arch/x86/kvm/svm.c -+++ b/arch/x86/kvm/svm.c -@@ -5017,7 +5017,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) - * If the L02 MSR bitmap does not intercept the MSR, then we need to - * save it. - */ -- if (!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL)) -+ if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) - svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); - - if (svm->spec_ctrl) -diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c -index aa2684a..3c3558b 100644 ---- a/arch/x86/kvm/vmx.c -+++ b/arch/x86/kvm/vmx.c -@@ -9024,7 +9024,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) - * If the L02 MSR bitmap does not intercept the MSR, then we need to - * save it. - */ -- if (!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL)) -+ if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) - vmx->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); - - if (vmx->spec_ctrl) --- -2.7.4 - |