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KVM: move EXIT_FASTPATH_REENTER_GUEST to common code 

Now that KVM is using static calls, calling vmx_vcpu_run and
vmx_sync_pir_to_irr does not incur anymore the cost of a
retpoline.

Therefore there is no need anymore to handle EXIT_FASTPATH_REENTER_GUEST
in vendor code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-02-02 10:44:23 -05:00
parent fb18d053b7
commit d89d04ab60
3 changed files with 15 additions and 22 deletions
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19
arch/x86/kvm/vmx/vmx.c
View File

@ -6711,11 +6711,9 @@ static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu,
static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu)
{
fastpath_t exit_fastpath;
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long cr3, cr4;
reenter_guest:
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!enable_vnmi &&
vmx->loaded_vmcs->soft_vnmi_blocked))
@ -6865,22 +6863,7 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (is_guest_mode(vcpu))
return EXIT_FASTPATH_NONE;
exit_fastpath = vmx_exit_handlers_fastpath(vcpu);
if (exit_fastpath == EXIT_FASTPATH_REENTER_GUEST) {
if (!kvm_vcpu_exit_request(vcpu)) {
/*
* FIXME: this goto should be a loop in vcpu_enter_guest,
* but it would incur the cost of a retpoline for now.
* Revisit once static calls are available.
*/
if (vcpu->arch.apicv_active)
vmx_sync_pir_to_irr(vcpu);
goto reenter_guest;
}
exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
}
return exit_fastpath;
return vmx_exit_handlers_fastpath(vcpu);
}
static void vmx_free_vcpu(struct kvm_vcpu *vcpu)

17
arch/x86/kvm/x86.c
View File

@ -1796,12 +1796,11 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
static inline bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
{
return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
xfer_to_guest_mode_work_pending();
}
EXPORT_SYMBOL_GPL(kvm_vcpu_exit_request);
/*
* The fast path for frequent and performance sensitive wrmsr emulation,
@ -9044,7 +9043,19 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
}
exit_fastpath = static_call(kvm_x86_run)(vcpu);
for (;;) {
exit_fastpath = static_call(kvm_x86_run)(vcpu);
if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST))
break;
if (unlikely(kvm_vcpu_exit_request(vcpu))) {
exit_fastpath = EXIT_FASTPATH_EXIT_HANDLED;
break;
}
if (vcpu->arch.apicv_active)
static_call(kvm_x86_sync_pir_to_irr)(vcpu);
}
/*
* Do this here before restoring debug registers on the host. And

1
arch/x86/kvm/x86.h
View File

@ -395,7 +395,6 @@ void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
int kvm_spec_ctrl_test_value(u64 value);
bool kvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu);
int kvm_handle_memory_failure(struct kvm_vcpu *vcpu, int r,
struct x86_exception *e);
int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva);