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KVM: x86: Rename and expose helper to detect if INIT/SIPI are allowed 

Rename and invert kvm_vcpu_latch_init() to kvm_apic_init_sipi_allowed()
so as to match the behavior of {interrupt,nmi,smi}_allowed(), and expose
the helper so that it can be used by kvm_vcpu_has_events() to determine
whether or not an INIT or SIPI is pending _and_ can be taken immediately.

Opportunistically replaced usage of the "latch" terminology with "blocked"
and/or "allowed", again to align with KVM's terminology used for all other
event types.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220921003201.1441511-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-09-21 00:31:52 +00:00 committed by Paolo Bonzini
parent 2ea89c7f7f
commit 1b7a1b78d6
4 changed files with 14 additions and 11 deletions
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4
arch/x86/kvm/lapic.c
View File

@ -3051,14 +3051,14 @@ int kvm_apic_accept_events(struct kvm_vcpu *vcpu)
}
/*
* INITs are latched while CPU is in specific states
* INITs are blocked while CPU is in specific states
* (SMM, VMX root mode, SVM with GIF=0).
* Because a CPU cannot be in these states immediately
* after it has processed an INIT signal (and thus in
* KVM_MP_STATE_INIT_RECEIVED state), just eat SIPIs
* and leave the INIT pending.
*/
if (kvm_vcpu_latch_init(vcpu)) {
if (!kvm_apic_init_sipi_allowed(vcpu)) {
WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED);
if (test_bit(KVM_APIC_SIPI, &pe))
clear_bit(KVM_APIC_SIPI, &apic->pending_events);

7
arch/x86/kvm/lapic.h
View File

@ -7,6 +7,7 @@
#include <linux/kvm_host.h>
#include "hyperv.h"
#include "kvm_cache_regs.h"
#define KVM_APIC_INIT 0
#define KVM_APIC_SIPI 1
@ -228,6 +229,12 @@ static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
}
static inline bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu)
{
return !is_smm(vcpu) &&
!static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
}
static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
{
return (irq->delivery_mode == APIC_DM_LOWEST ||

9
arch/x86/kvm/x86.c
View File

@ -11295,11 +11295,12 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
goto out;
/*
* KVM_MP_STATE_INIT_RECEIVED means the processor is in
* INIT state; latched init should be reported using
* KVM_SET_VCPU_EVENTS, so reject it here.
* Pending INITs are reported using KVM_SET_VCPU_EVENTS, disallow
* forcing the guest into INIT/SIPI if those events are supposed to be
* blocked. KVM prioritizes SMI over INIT, so reject INIT/SIPI state
* if an SMI is pending as well.
*/
if ((kvm_vcpu_latch_init(vcpu) || vcpu->arch.smi_pending) &&
if ((!kvm_apic_init_sipi_allowed(vcpu) || vcpu->arch.smi_pending) &&
(mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
goto out;

5
arch/x86/kvm/x86.h
View File

@ -275,11 +275,6 @@ static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk)
return !(kvm->arch.disabled_quirks & quirk);
}
static inline bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu)
{
return is_smm(vcpu) || static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
}
void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
u64 get_kvmclock_ns(struct kvm *kvm);