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KVM: x86: latch INITs while in system management mode 

Do not process INITs immediately while in system management mode, keep
it instead in apic->pending_events.  Tell userspace if an INIT is
pending when they issue GET_VCPU_EVENTS, and similarly handle the
new field in SET_VCPU_EVENTS.

Note that the same treatment should be done while in VMX non-root mode.

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-04 10:41:21 +02:00
parent 64d6067057
commit cd7764fe9f
2 changed files with 15 additions and 1 deletions
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13
arch/x86/kvm/lapic.c
View File

@ -2057,8 +2057,19 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events)
return;
pe = xchg(&apic->pending_events, 0);
/*
* INITs are latched while in SMM. Because an SMM CPU cannot
* be in KVM_MP_STATE_INIT_RECEIVED state, just eat SIPIs
* and delay processing of INIT until the next RSM.
*/
if (is_smm(vcpu)) {
WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED);
if (test_bit(KVM_APIC_SIPI, &apic->pending_events))
clear_bit(KVM_APIC_SIPI, &apic->pending_events);
return;
}
pe = xchg(&apic->pending_events, 0);
if (test_bit(KVM_APIC_INIT, &pe)) {
kvm_lapic_reset(vcpu, true);
kvm_vcpu_reset(vcpu, true);

3
arch/x86/kvm/x86.c
View File

@ -5482,6 +5482,9 @@ static void kvm_smm_changed(struct kvm_vcpu *vcpu)
if (unlikely(vcpu->arch.smi_pending)) {
kvm_make_request(KVM_REQ_SMI, vcpu);
vcpu->arch.smi_pending = 0;
} else {
/* Process a latched INIT, if any. */
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
}
}