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i386/kvm: add support for Hyper-V IPI send

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Hyper-V PV IPI support is merged to KVM, enable the feature in Qemu. When
enabled, this allows Windows guests to send IPIs to other vCPUs with a
single hypercall even when there are >64 vCPUs in the request.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20181009130853.6412-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2018-10-09 15:08:53 +02:00 committed by Paolo Bonzini
parent ca9759c2a9
commit 6b7a98303b
4 changed files with 16 additions and 1 deletions
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1
target/i386/cpu.c
View file

@ -5564,6 +5564,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL("hv-frequencies", X86CPU, hyperv_frequencies, false),
DEFINE_PROP_BOOL("hv-reenlightenment", X86CPU, hyperv_reenlightenment, false),
DEFINE_PROP_BOOL("hv-tlbflush", X86CPU, hyperv_tlbflush, false),
DEFINE_PROP_BOOL("hv-ipi", X86CPU, hyperv_ipi, false),
DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true),
DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),

1
target/i386/cpu.h
View file

@ -1382,6 +1382,7 @@ struct X86CPU {
bool hyperv_frequencies;
bool hyperv_reenlightenment;
bool hyperv_tlbflush;
bool hyperv_ipi;
bool check_cpuid;
bool enforce_cpuid;
bool expose_kvm;

1
target/i386/hyperv-proto.h
View file

@ -58,6 +58,7 @@
#define HV_APIC_ACCESS_RECOMMENDED (1u << 3)
#define HV_SYSTEM_RESET_RECOMMENDED (1u << 4)
#define HV_RELAXED_TIMING_RECOMMENDED (1u << 5)
#define HV_CLUSTER_IPI_RECOMMENDED (1u << 10)
#define HV_EX_PROCESSOR_MASKS_RECOMMENDED (1u << 11)
/*

14
target/i386/kvm.c
View file

@ -608,7 +608,8 @@ static bool hyperv_enabled(X86CPU *cpu)
cpu->hyperv_synic ||
cpu->hyperv_stimer ||
cpu->hyperv_reenlightenment ||
cpu->hyperv_tlbflush);
cpu->hyperv_tlbflush ||
cpu->hyperv_ipi);
}
static int kvm_arch_set_tsc_khz(CPUState *cs)
@ -888,6 +889,17 @@ int kvm_arch_init_vcpu(CPUState *cs)
c->eax |= HV_REMOTE_TLB_FLUSH_RECOMMENDED;
c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
}
if (cpu->hyperv_ipi) {
if (kvm_check_extension(cs->kvm_state,
KVM_CAP_HYPERV_SEND_IPI) <= 0) {
fprintf(stderr, "Hyper-V IPI send support "
"(requested by 'hv-ipi' cpu flag) "
" is not supported by kernel\n");
return -ENOSYS;
}
c->eax |= HV_CLUSTER_IPI_RECOMMENDED;
c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
}
c->ebx = cpu->hyperv_spinlock_attempts;