From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42100) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g9ThH-0007OQ-VY for qemu-devel@nongnu.org; Mon, 08 Oct 2018 07:27:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1g9ThH-0004wy-5T for qemu-devel@nongnu.org; Mon, 08 Oct 2018 07:27:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53854) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1g9ThG-0004wZ-TS for qemu-devel@nongnu.org; Mon, 08 Oct 2018 07:27:35 -0400 From: Vitaly Kuznetsov Date: Mon, 8 Oct 2018 13:27:26 +0200 Message-Id: <20181008112726.16140-3-vkuznets@redhat.com> In-Reply-To: <20181008112726.16140-1-vkuznets@redhat.com> References: <20181008112726.16140-1-vkuznets@redhat.com> Subject: [Qemu-devel] [PATCH 2/2] i386/kvm: add support for Hyper-V IPI send List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , Roman Kagan 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 --- 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