diff options
| author | Wanpeng Li <wanpengli@tencent.com> | 2020-04-28 14:23:23 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-05-15 12:26:17 -0400 |
| commit | dcf068da7eb29362adf13f20e5c44a18d98ed9a3 (patch) | |
| tree | d355198e69cfadc315c11896eb23ed61b890ce4c | |
| parent | 9e826feb8f114964cbdce026340b6cb9bde68a18 (diff) | |
KVM: VMX: Introduce generic fastpath handler
Introduce generic fastpath handler to handle MSR fastpath, VMX-preemption
timer fastpath etc; move it after vmx_complete_interrupts() in order to
catch events delivered to the guest, and abort the fast path in later
patches. While at it, move the kvm_exit tracepoint so that it is printed
for fastpath vmexits as well.
There is no observed performance effect for the IPI fastpath after this patch.
Tested-by: Haiwei Li <lihaiwei@tencent.com>
Cc: Haiwei Li <lihaiwei@tencent.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <1588055009-12677-2-git-send-email-wanpengli@tencent.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index fc2b660aea7d..d883fbb63566 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -5933,8 +5933,6 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, u32 exit_reason = vmx->exit_reason; u32 vectoring_info = vmx->idt_vectoring_info; - trace_kvm_exit(exit_reason, vcpu, KVM_ISA_VMX); - /* * Flush logged GPAs PML buffer, this will make dirty_bitmap more * updated. Another good is, in kvm_vm_ioctl_get_dirty_log, before @@ -6630,6 +6628,16 @@ void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp) } } +static enum exit_fastpath_completion vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu) +{ + switch (to_vmx(vcpu)->exit_reason) { + case EXIT_REASON_MSR_WRITE: + return handle_fastpath_set_msr_irqoff(vcpu); + default: + return EXIT_FASTPATH_NONE; + } +} + bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched); static enum exit_fastpath_completion vmx_vcpu_run(struct kvm_vcpu *vcpu) @@ -6784,20 +6792,21 @@ static enum exit_fastpath_completion vmx_vcpu_run(struct kvm_vcpu *vcpu) if (unlikely((u16)vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)) kvm_machine_check(); + trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX); + if (unlikely(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) return EXIT_FASTPATH_NONE; - if (!is_guest_mode(vcpu) && vmx->exit_reason == EXIT_REASON_MSR_WRITE) - exit_fastpath = handle_fastpath_set_msr_irqoff(vcpu); - else - exit_fastpath = EXIT_FASTPATH_NONE; - vmx->loaded_vmcs->launched = 1; vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); vmx_recover_nmi_blocking(vmx); vmx_complete_interrupts(vmx); + if (is_guest_mode(vcpu)) + return EXIT_FASTPATH_NONE; + + exit_fastpath = vmx_exit_handlers_fastpath(vcpu); return exit_fastpath; } |