The majority of patches in this series are loosely related optimizations to pick off low(ish) hanging fruit in nested VM-Entry, e.g. there are many VMREADs and VMWRITEs that can be optimized away without too much effort. The major change (in terms of performance) is to not "put" the vCPU state when switching between vmcs01 and vmcs02, which can reudce the latency of a nested VM-Entry by upwards of 1000 cycles. A few bug fixes are prepended as they touch code that happens to be modified by the various optimizations. Sean Christopherson (15): KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped KVM: VMX: Always signal #GP on WRMSR to MSR_IA32_CR_PAT with bad value KVM: nVMX: Always sync GUEST_BNDCFGS when it comes from vmcs01 KVM: nVMX: Write ENCLS-exiting bitmap once per vmcs02 KVM: nVMX: Don't rewrite GUEST_PML_INDEX during nested VM-Entry KVM: nVMX: Don't "put" vCPU or host state when switching VMCS KVM: nVMX: Don't reread VMCS-agnostic state when switching VMCS KVM: nVMX: Don't speculatively write virtual-APIC page address KVM: nVMX: Don't speculatively write APIC-access page address KVM: nVMX: Update vmcs12 for MSR_IA32_CR_PAT when it's written KVM: nVMX: Update vmcs12 for SYSENTER MSRs when they're written KVM: nVMX: Update vmcs12 for MSR_IA32_DEBUGCTLMSR when it's written KVM: nVMX: Update vmcs02 GUEST_IA32_DEBUGCTL only when vmcs12 is dirty KVM: nVMX: Don't update GUEST_BNDCFGS if it's clean in HV eVMCS KVM: nVMX: Copy PDPTRs to/from vmcs12 only when necessary arch/x86/kvm/vmx/nested.c | 142 +++++++++++++++++++------------------- arch/x86/kvm/vmx/vmx.c | 93 +++++++++++++++++-------- arch/x86/kvm/vmx/vmx.h | 5 +- 3 files changed, 136 insertions(+), 104 deletions(-) -- 2.21.0
