| Message ID | 20211009021236.4122790-13-seanjc@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: Halt-polling and x86 APICv overhaul | expand |
On Fri, 2021-10-08 at 19:12 -0700, Sean Christopherson wrote: > Rename a variety of HLT-related helpers to free up the function name > "kvm_vcpu_halt" for future use in generic KVM code, e.g. to differentiate > between "block" and "halt". > > No functional change intended. > > Reviewed-by: David Matlack <dmatlack@google.com> > Signed-off-by: Sean Christopherson <seanjc@google.com> > --- > arch/x86/include/asm/kvm_host.h | 2 +- > arch/x86/kvm/vmx/nested.c | 2 +- > arch/x86/kvm/vmx/vmx.c | 4 ++-- > arch/x86/kvm/x86.c | 13 +++++++------ > 4 files changed, 11 insertions(+), 10 deletions(-) > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > index 7aafc27ce7a9..328103a520d3 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1689,7 +1689,7 @@ int kvm_emulate_monitor(struct kvm_vcpu *vcpu); > int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in); > int kvm_emulate_cpuid(struct kvm_vcpu *vcpu); > int kvm_emulate_halt(struct kvm_vcpu *vcpu); > -int kvm_vcpu_halt(struct kvm_vcpu *vcpu); > +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu); > int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu); > int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu); > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c > index af1bbb73430a..d0237a441feb 100644 > --- a/arch/x86/kvm/vmx/nested.c > +++ b/arch/x86/kvm/vmx/nested.c > @@ -3619,7 +3619,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) > !(nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING) && > (vmcs12->guest_rflags & X86_EFLAGS_IF))) { > vmx->nested.nested_run_pending = 0; > - return kvm_vcpu_halt(vcpu); > + return kvm_emulate_halt_noskip(vcpu); > } > break; > case GUEST_ACTIVITY_WAIT_SIPI: > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index 1c8b2b6e7ed9..5517893f12fc 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -4741,7 +4741,7 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu, > if (kvm_emulate_instruction(vcpu, 0)) { > if (vcpu->arch.halt_request) { > vcpu->arch.halt_request = 0; > - return kvm_vcpu_halt(vcpu); > + return kvm_emulate_halt_noskip(vcpu); Could you elaborate on why you choose _noskip suffix? As far as I see, kvm_vcpu_halt just calls __kvm_vcpu_halt with new VCPU run state/exit reason, which is used only when local apic is not in the kernel (which is these days not that supported configuration). Other user of __kvm_vcpu_halt is something SEV related. Best regards, Maxim Levitsky > } > return 1; > } > @@ -5415,7 +5415,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) > > if (vcpu->arch.halt_request) { > vcpu->arch.halt_request = 0; > - return kvm_vcpu_halt(vcpu); > + return kvm_emulate_halt_noskip(vcpu); > } > > /* > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 4a52a08707de..9c23ae1d483d 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -8649,7 +8649,7 @@ void kvm_arch_exit(void) > #endif > } > > -static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) > +static int __kvm_emulate_halt(struct kvm_vcpu *vcpu, int state, int reason) > { > ++vcpu->stat.halt_exits; > if (lapic_in_kernel(vcpu)) { > @@ -8661,11 +8661,11 @@ static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) > } > } > > -int kvm_vcpu_halt(struct kvm_vcpu *vcpu) > +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu) > { > - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); > + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); > } > -EXPORT_SYMBOL_GPL(kvm_vcpu_halt); > +EXPORT_SYMBOL_GPL(kvm_emulate_halt_noskip); > > int kvm_emulate_halt(struct kvm_vcpu *vcpu) > { > @@ -8674,7 +8674,7 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu) > * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered > * KVM_EXIT_DEBUG here. > */ > - return kvm_vcpu_halt(vcpu) && ret; > + return kvm_emulate_halt_noskip(vcpu) && ret; > } > EXPORT_SYMBOL_GPL(kvm_emulate_halt); > > @@ -8682,7 +8682,8 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu) > { > int ret = kvm_skip_emulated_instruction(vcpu); > > - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, KVM_EXIT_AP_RESET_HOLD) && ret; > + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, > + KVM_EXIT_AP_RESET_HOLD) && ret; > } > EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold); >
On Wed, 2021-10-27 at 17:10 +0300, Maxim Levitsky wrote: > On Fri, 2021-10-08 at 19:12 -0700, Sean Christopherson wrote: > > Rename a variety of HLT-related helpers to free up the function name > > "kvm_vcpu_halt" for future use in generic KVM code, e.g. to differentiate > > between "block" and "halt". > > > > No functional change intended. > > > > Reviewed-by: David Matlack <dmatlack@google.com> > > Signed-off-by: Sean Christopherson <seanjc@google.com> > > --- > > arch/x86/include/asm/kvm_host.h | 2 +- > > arch/x86/kvm/vmx/nested.c | 2 +- > > arch/x86/kvm/vmx/vmx.c | 4 ++-- > > arch/x86/kvm/x86.c | 13 +++++++------ > > 4 files changed, 11 insertions(+), 10 deletions(-) > > > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > > index 7aafc27ce7a9..328103a520d3 100644 > > --- a/arch/x86/include/asm/kvm_host.h > > +++ b/arch/x86/include/asm/kvm_host.h > > @@ -1689,7 +1689,7 @@ int kvm_emulate_monitor(struct kvm_vcpu *vcpu); > > int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in); > > int kvm_emulate_cpuid(struct kvm_vcpu *vcpu); > > int kvm_emulate_halt(struct kvm_vcpu *vcpu); > > -int kvm_vcpu_halt(struct kvm_vcpu *vcpu); > > +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu); > > int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu); > > int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu); > > > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c > > index af1bbb73430a..d0237a441feb 100644 > > --- a/arch/x86/kvm/vmx/nested.c > > +++ b/arch/x86/kvm/vmx/nested.c > > @@ -3619,7 +3619,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) > > !(nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING) && > > (vmcs12->guest_rflags & X86_EFLAGS_IF))) { > > vmx->nested.nested_run_pending = 0; > > - return kvm_vcpu_halt(vcpu); > > + return kvm_emulate_halt_noskip(vcpu); > > } > > break; > > case GUEST_ACTIVITY_WAIT_SIPI: > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > > index 1c8b2b6e7ed9..5517893f12fc 100644 > > --- a/arch/x86/kvm/vmx/vmx.c > > +++ b/arch/x86/kvm/vmx/vmx.c > > @@ -4741,7 +4741,7 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu, > > if (kvm_emulate_instruction(vcpu, 0)) { > > if (vcpu->arch.halt_request) { > > vcpu->arch.halt_request = 0; > > - return kvm_vcpu_halt(vcpu); > > + return kvm_emulate_halt_noskip(vcpu); > > Could you elaborate on why you choose _noskip suffix? > > As far as I see, kvm_vcpu_halt just calls __kvm_vcpu_halt with new VCPU run state/exit reason, > which is used only when local apic is not in the kernel (which is these days not that > supported configuration). > > Other user of __kvm_vcpu_halt is something SEV related. > > Best regards, > Maxim Levitsky > > > > } > > return 1; > > } > > @@ -5415,7 +5415,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) > > > > if (vcpu->arch.halt_request) { > > vcpu->arch.halt_request = 0; > > - return kvm_vcpu_halt(vcpu); > > + return kvm_emulate_halt_noskip(vcpu); > > } > > > > /* > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > > index 4a52a08707de..9c23ae1d483d 100644 > > --- a/arch/x86/kvm/x86.c > > +++ b/arch/x86/kvm/x86.c > > @@ -8649,7 +8649,7 @@ void kvm_arch_exit(void) > > #endif > > } > > > > -static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) > > +static int __kvm_emulate_halt(struct kvm_vcpu *vcpu, int state, int reason) > > { > > ++vcpu->stat.halt_exits; > > if (lapic_in_kernel(vcpu)) { > > @@ -8661,11 +8661,11 @@ static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) > > } > > } > > > > -int kvm_vcpu_halt(struct kvm_vcpu *vcpu) > > +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu) > > { > > - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); > > + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); > > } > > -EXPORT_SYMBOL_GPL(kvm_vcpu_halt); > > +EXPORT_SYMBOL_GPL(kvm_emulate_halt_noskip); > > > > int kvm_emulate_halt(struct kvm_vcpu *vcpu) > > { > > @@ -8674,7 +8674,7 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu) > > * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered > > * KVM_EXIT_DEBUG here. > > */ > > - return kvm_vcpu_halt(vcpu) && ret; > > + return kvm_emulate_halt_noskip(vcpu) && ret; > > } > > EXPORT_SYMBOL_GPL(kvm_emulate_halt); > > > > @@ -8682,7 +8682,8 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu) > > { > > int ret = kvm_skip_emulated_instruction(vcpu); > > > > - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, KVM_EXIT_AP_RESET_HOLD) && ret; > > + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, > > + KVM_EXIT_AP_RESET_HOLD) && ret; > > } > > EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold); > > Also while at it, why not to use say '__kvm_emulate_hlt' ('hlt' instead of 'halt') to put emphasis on the fact that we are emulating a cpu instruction? Best regards, Maxim Levitsky
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 7aafc27ce7a9..328103a520d3 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1689,7 +1689,7 @@ int kvm_emulate_monitor(struct kvm_vcpu *vcpu); int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in); int kvm_emulate_cpuid(struct kvm_vcpu *vcpu); int kvm_emulate_halt(struct kvm_vcpu *vcpu); -int kvm_vcpu_halt(struct kvm_vcpu *vcpu); +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu); int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu); int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu); diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index af1bbb73430a..d0237a441feb 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3619,7 +3619,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) !(nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING) && (vmcs12->guest_rflags & X86_EFLAGS_IF))) { vmx->nested.nested_run_pending = 0; - return kvm_vcpu_halt(vcpu); + return kvm_emulate_halt_noskip(vcpu); } break; case GUEST_ACTIVITY_WAIT_SIPI: diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 1c8b2b6e7ed9..5517893f12fc 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4741,7 +4741,7 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu, if (kvm_emulate_instruction(vcpu, 0)) { if (vcpu->arch.halt_request) { vcpu->arch.halt_request = 0; - return kvm_vcpu_halt(vcpu); + return kvm_emulate_halt_noskip(vcpu); } return 1; } @@ -5415,7 +5415,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) if (vcpu->arch.halt_request) { vcpu->arch.halt_request = 0; - return kvm_vcpu_halt(vcpu); + return kvm_emulate_halt_noskip(vcpu); } /* diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 4a52a08707de..9c23ae1d483d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8649,7 +8649,7 @@ void kvm_arch_exit(void) #endif } -static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) +static int __kvm_emulate_halt(struct kvm_vcpu *vcpu, int state, int reason) { ++vcpu->stat.halt_exits; if (lapic_in_kernel(vcpu)) { @@ -8661,11 +8661,11 @@ static int __kvm_vcpu_halt(struct kvm_vcpu *vcpu, int state, int reason) } } -int kvm_vcpu_halt(struct kvm_vcpu *vcpu) +int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu) { - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_HALTED, KVM_EXIT_HLT); } -EXPORT_SYMBOL_GPL(kvm_vcpu_halt); +EXPORT_SYMBOL_GPL(kvm_emulate_halt_noskip); int kvm_emulate_halt(struct kvm_vcpu *vcpu) { @@ -8674,7 +8674,7 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu) * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered * KVM_EXIT_DEBUG here. */ - return kvm_vcpu_halt(vcpu) && ret; + return kvm_emulate_halt_noskip(vcpu) && ret; } EXPORT_SYMBOL_GPL(kvm_emulate_halt); @@ -8682,7 +8682,8 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu) { int ret = kvm_skip_emulated_instruction(vcpu); - return __kvm_vcpu_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, KVM_EXIT_AP_RESET_HOLD) && ret; + return __kvm_emulate_halt(vcpu, KVM_MP_STATE_AP_RESET_HOLD, + KVM_EXIT_AP_RESET_HOLD) && ret; } EXPORT_SYMBOL_GPL(kvm_emulate_ap_reset_hold);