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X-Received-From: 2607:f8b0:400e:c05::244 Subject: [Qemu-devel] [PATCH v2] i386/kvm: add support for KVM_CAP_X86_DISABLE_EXITS X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Eduardo Habkost , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 From: Wanpeng Li This patch adds support for KVM_CAP_X86_DISABLE_EXITS. Provides userspace w= ith=20 per-VM capability(KVM_CAP_X86_DISABLE_EXITS) to not intercept MWAIT/HLT/PAU= SE=20 in order that to improve latency in some workloads. Cc: Paolo Bonzini Cc: Radim Kr=C4=8Dm=C3=A1=C5=99 =20 Cc: Eduardo Habkost Signed-off-by: Wanpeng Li --- v1 -> v2: * disable kvm-hint-dedicated if kvm-pv-unhalt is specified linux-headers/linux/kvm.h | 6 +++++- target/i386/cpu.h | 2 ++ target/i386/kvm.c | 15 +++++++++++++++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h index a167be8..857df15 100644 --- a/linux-headers/linux/kvm.h +++ b/linux-headers/linux/kvm.h @@ -925,7 +925,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_S390_GS 140 #define KVM_CAP_S390_AIS 141 #define KVM_CAP_SPAPR_TCE_VFIO 142 -#define KVM_CAP_X86_GUEST_MWAIT 143 +#define KVM_CAP_X86_DISABLE_EXITS 143 #define KVM_CAP_ARM_USER_IRQ 144 #define KVM_CAP_S390_CMMA_MIGRATION 145 #define KVM_CAP_PPC_FWNMI 146 @@ -1508,6 +1508,10 @@ struct kvm_assigned_msix_entry { #define KVM_X2APIC_API_USE_32BIT_IDS (1ULL << 0) #define KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK (1ULL << 1) =20 +#define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0) +#define KVM_X86_DISABLE_EXITS_HLT (1 << 1) +#define KVM_X86_DISABLE_EXITS_PAUSE (1 << 2) + /* Available with KVM_CAP_ARM_USER_IRQ */ =20 /* Bits for run->s.regs.device_irq_level */ diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 1b219fa..965de1b 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -685,6 +685,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS]; #define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulat= ion Single Precision */ #define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */ =20 +#define KVM_PV_UNHALT (1U << 7) + #define KVM_HINTS_DEDICATED (1U << 0) =20 #define CPUID_8000_0008_EBX_IBPB (1U << 12) /* Indirect Branch Predicti= on Barrier */ diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 6c49954..9357caa 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -1029,6 +1029,21 @@ int kvm_arch_init_vcpu(CPUState *cs) } } =20 + if (env->features[FEAT_KVM_HINTS] & KVM_HINTS_DEDICATED) { + int disable_exits =3D kvm_check_extension(cs->kvm_state, KVM_CAP_X= 86_DISABLE_EXITS); + + if (disable_exits) { + disable_exits &=3D (KVM_X86_DISABLE_EXITS_MWAIT | + KVM_X86_DISABLE_EXITS_HLT | + KVM_X86_DISABLE_EXITS_PAUSE); + if (env->user_features[KVM] & KVM_PV_UNHALT) + disable_exits &=3D ~KVM_X86_DISABLE_EXITS_HLT; + } + if (kvm_vm_enable_cap(cs->kvm_state, KVM_CAP_X86_DISABLE_EXITS, 0,= disable_exits)) { + error_report("kvm: DISABLE EXITS not supported"); + } + } + qemu_add_vm_change_state_handler(cpu_update_state, env); =20 c =3D cpuid_find_entry(&cpuid_data.cpuid, 1, 0); --=20 2.7.4