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target/i386: support KVM_FEATURE_ASYNC_PF_INT

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Linux-5.8 introduced interrupt based mechanism for 'page ready' events
delivery and disabled the old, #PF based one (see commit 2635b5c4a0e4
"KVM: x86: interrupt based APF 'page ready' event delivery"). Linux
guest switches to using in in 5.9 (see commit b1d405751cd5 "KVM: x86:
Switch KVM guest to using interrupts for page ready APF delivery").
The feature has a new KVM_FEATURE_ASYNC_PF_INT bit assigned and
the interrupt vector is set in MSR_KVM_ASYNC_PF_INT MSR. Support this
in QEMU.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200908141206.357450-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2020-09-08 16:12:06 +02:00 • committed by Paolo Bonzini
parent 1b7e01d008
commit db5daafab2
4 changed files with 32 additions and 1 deletions
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19
target/i386/machine.c
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@ -394,6 +394,13 @@ static bool async_pf_msr_needed(void *opaque)
return cpu->env.async_pf_en_msr != 0;
}
static bool async_pf_int_msr_needed(void *opaque)
{
X86CPU *cpu = opaque;
return cpu->env.async_pf_int_msr != 0;
}
static bool pv_eoi_msr_needed(void *opaque)
{
X86CPU *cpu = opaque;
@ -467,6 +474,17 @@ static const VMStateDescription vmstate_async_pf_msr = {
}
};
static const VMStateDescription vmstate_async_pf_int_msr = {
.name = "cpu/async_pf_int_msr",
.version_id = 1,
.minimum_version_id = 1,
.needed = async_pf_int_msr_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.async_pf_int_msr, X86CPU),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_pv_eoi_msr = {
.name = "cpu/async_pv_eoi_msr",
.version_id = 1,
@ -1438,6 +1456,7 @@ VMStateDescription vmstate_x86_cpu = {
.subsections = (const VMStateDescription*[]) {
&vmstate_exception_info,
&vmstate_async_pf_msr,
&vmstate_async_pf_int_msr,
&vmstate_pv_eoi_msr,
&vmstate_steal_time_msr,
&vmstate_poll_control_msr,