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[Qemu-devel] [PATCH 2/2] i386/kvm: add support for Hyper-V IPI send
From: |
Vitaly Kuznetsov |
Subject: |
[Qemu-devel] [PATCH 2/2] i386/kvm: add support for Hyper-V IPI send |
Date: |
Mon, 8 Oct 2018 13:27:26 +0200 |
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 <address@hidden>
---
target/i386/cpu.c | 1 +
target/i386/cpu.h | 1 +
target/i386/hyperv-proto.h | 1 +
target/i386/kvm.c | 14 +++++++++++++-
4 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index c88876dfe3..32ea041c06 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -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),
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 730c06f80a..caa1544b2e 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -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;
diff --git a/target/i386/hyperv-proto.h b/target/i386/hyperv-proto.h
index d6d5a79293..87f36d14e8 100644
--- a/target/i386/hyperv-proto.h
+++ b/target/i386/hyperv-proto.h
@@ -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)
/*
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index dc4047b02f..795aa52938 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -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;
--
2.17.1
- [Qemu-devel] [PATCH 0/2] i386/kvm: enable Hyper-V PV IPI mechanism, Vitaly Kuznetsov, 2018/10/08
- [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Vitaly Kuznetsov, 2018/10/08
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Roman Kagan, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Vitaly Kuznetsov, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Roman Kagan, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Vitaly Kuznetsov, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Roman Kagan, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Cornelia Huck, 2018/10/09
- Re: [Qemu-devel] [PATCH 1/2] linux-headers: update to pre-4.20 (kvm/queue), Paolo Bonzini, 2018/10/09
[Qemu-devel] [PATCH 2/2] i386/kvm: add support for Hyper-V IPI send,
Vitaly Kuznetsov <=