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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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3
target/i386/cpu.c
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@ -799,7 +799,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
"kvmclock", "kvm-nopiodelay", "kvm-mmu", "kvmclock",
"kvm-asyncpf", "kvm-steal-time", "kvm-pv-eoi", "kvm-pv-unhalt",
NULL, "kvm-pv-tlb-flush", NULL, "kvm-pv-ipi",
"kvm-poll-control", "kvm-pv-sched-yield", NULL, NULL,
"kvm-poll-control", "kvm-pv-sched-yield", "kvm-asyncpf-int", NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
"kvmclock-stable-bit", NULL, NULL, NULL,
@ -6988,6 +6988,7 @@ static void x86_cpu_initfn(Object *obj)
object_property_add_alias(obj, "kvm_nopiodelay", obj, "kvm-nopiodelay");
object_property_add_alias(obj, "kvm_mmu", obj, "kvm-mmu");
object_property_add_alias(obj, "kvm_asyncpf", obj, "kvm-asyncpf");
object_property_add_alias(obj, "kvm_asyncpf_int", obj, "kvm-asyncpf-int");
object_property_add_alias(obj, "kvm_steal_time", obj, "kvm-steal-time");
object_property_add_alias(obj, "kvm_pv_eoi", obj, "kvm-pv-eoi");
object_property_add_alias(obj, "kvm_pv_unhalt", obj, "kvm-pv-unhalt");