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KVM: x86: Move INIT_RECEIVED vs. INIT/SIPI blocked check to KVM_RUN

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Check for the should-be-impossible scenario of a vCPU being in
Wait-For-SIPI with INIT/SIPI blocked during KVM_RUN instead of trying to
detect and prevent illegal combinations in every ioctl that sets relevant
state.  Attempting to handle every possible "set" path is a losing game of
whack-a-mole, and risks breaking userspace.  E.g. INIT/SIPI are blocked on
Intel if the vCPU is in VMX Root mode (post-VMXON), and on AMD if GIF=0.
Handling those scenarios would require potentially breaking changes to
{vmx,svm}_set_nested_state().

Moving the check to KVM_RUN fixes a syzkaller-induced splat due to the
aforementioned VMXON case, and in theory should close the hole once and for
all.

Note, kvm_x86_vcpu_pre_run() already handles SIPI_RECEIVED, only the WFS
case needs additional attention.

Reported-by: syzbot+c1cbaedc2613058d5194@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?id=490ae63d8d89cb82c5d462d16962cf371df0e476
Link: https://lore.kernel.org/r/20250605195018.539901-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-06-05 12:50:17 -07:00
parent 16777ebded
commit 0fe3e8d804
1 changed files with 8 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
arch/x86/kvm/x86.c
View File

@@ -5487,12 +5487,6 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
(events->exception.nr > 31 || events->exception.nr == NMI_VECTOR))
return -EINVAL;
/* INITs are latched while in SMM */
if (events->flags & KVM_VCPUEVENT_VALID_SMM &&
(events->smi.smm || events->smi.pending) &&
vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED)
return -EINVAL;
process_nmi(vcpu);
/*
@@ -11579,6 +11573,14 @@ static int kvm_x86_vcpu_pre_run(struct kvm_vcpu *vcpu)
if (WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED))
return -EINVAL;
/*
* Disallow running the vCPU if userspace forced it into an impossible
* MP_STATE, e.g. if the vCPU is in WFS but SIPI is blocked.
*/
if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED &&
!kvm_apic_init_sipi_allowed(vcpu))
return -EINVAL;
return kvm_x86_call(vcpu_pre_run)(vcpu);
}
@@ -11927,16 +11929,6 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
goto out;
}
/*
* Pending INITs are reported using KVM_SET_VCPU_EVENTS, disallow
* forcing the guest into INIT/SIPI if those events are supposed to be
* blocked.
*/
if (!kvm_apic_init_sipi_allowed(vcpu) &&
(mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
goto out;
if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
kvm_set_mp_state(vcpu, KVM_MP_STATE_INIT_RECEIVED);
set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);