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i386: kvm: extend kvm_{get, put}_vcpu_events to support pending triple fault

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For the direct triple faults, i.e. hardware detected and KVM morphed
to VM-Exit, KVM will never lose them. But for triple faults sythesized
by KVM, e.g. the RSM path, if KVM exits to userspace before the request
is serviced, userspace could migrate the VM and lose the triple fault.

A new flag KVM_VCPUEVENT_VALID_TRIPLE_FAULT is defined to signal that
the event.triple_fault_pending field contains a valid state if the
KVM_CAP_X86_TRIPLE_FAULT_EVENT capability is enabled.

Acked-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20220929072014.20705-2-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chenyi Qiang 2022-09-29 15:20:11 +08:00 • committed by Paolo Bonzini
parent 298c31de98
commit 12f89a39cf
4 changed files with 42 additions and 0 deletions
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20
target/i386/machine.c
View file

@ -1562,6 +1562,25 @@ static const VMStateDescription vmstate_arch_lbr = {
}
};
static bool triple_fault_needed(void *opaque)
{
X86CPU *cpu = opaque;
CPUX86State *env = &cpu->env;
return env->triple_fault_pending;
}
static const VMStateDescription vmstate_triple_fault = {
.name = "cpu/triple_fault",
.version_id = 1,
.minimum_version_id = 1,
.needed = triple_fault_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT8(env.triple_fault_pending, X86CPU),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_x86_cpu = {
.name = "cpu",
.version_id = 12,
@ -1706,6 +1725,7 @@ const VMStateDescription vmstate_x86_cpu = {
&vmstate_amx_xtile,
#endif
&vmstate_arch_lbr,
&vmstate_triple_fault,
NULL
}
};