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KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault

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For the triple fault sythesized by KVM, e.g. the RSM path or
nested_vmx_abort(), if KVM exits to userspace before the request is
serviced, userspace could migrate the VM and lose the triple fault.

Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault with a
new event KVM_VCPUEVENT_VALID_FAULT_FAULT so that userspace can save and
restore the triple fault event. This extension is guarded by a new KVM
capability KVM_CAP_TRIPLE_FAULT_EVENT.

Note that in the set_vcpu_events path, userspace is able to set/clear
the triple fault request through triple_fault.pending field.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20220524135624.22988-2-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chenyi Qiang 2022-05-24 21:56:21 +08:00 • committed by Paolo Bonzini
parent 7aadaa988c
commit ed2351174e
5 changed files with 36 additions and 2 deletions
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1
include/uapi/linux/kvm.h
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@ -1158,6 +1158,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_SYSTEM_EVENT_DATA 215
#define KVM_CAP_ARM_SYSTEM_SUSPEND 216
#define KVM_CAP_S390_PROTECTED_DUMP 217
#define KVM_CAP_X86_TRIPLE_FAULT_EVENT 218
#ifdef KVM_CAP_IRQ_ROUTING