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i386: Hyper-V XMM fast hypercall input feature 

Hyper-V specification allows to pass parameters for certain hypercalls
using XMM registers ("XMM Fast Hypercall Input"). When the feature is
in use, it allows for faster hypercalls processing as KVM can avoid
reading guest's memory.

KVM supports the feature since v5.14.

Rename HV_HYPERCALL_{PARAMS_XMM_AVAILABLE -> XMM_INPUT_AVAILABLE} to
comply with KVM.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220525115949.1294004-4-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-05-25 13:59:46 +02:00 committed by Paolo Bonzini
parent 869840d26c
commit 9411e8b6fa
5 changed files with 17 additions and 1 deletions
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6
docs/hyperv.txt
View File

@ -249,6 +249,12 @@ Enlightened VMCS ('hv-evmcs') feature to also be enabled.
Recommended: hv-evmcs (Intel)
3.23. hv-xmm-input
===================
Hyper-V specification allows to pass parameters for certain hypercalls using XMM
registers ("XMM Fast Hypercall Input"). When the feature is in use, it allows
for faster hypercalls processing as KVM can avoid reading guest's memory.
4. Supplementary features
=========================

2
target/i386/cpu.c
View File

@ -6970,6 +6970,8 @@ static Property x86_cpu_properties[] = {
HYPERV_FEAT_AVIC, 0),
DEFINE_PROP_BIT64("hv-emsr-bitmap", X86CPU, hyperv_features,
HYPERV_FEAT_MSR_BITMAP, 0),
DEFINE_PROP_BIT64("hv-xmm-input", X86CPU, hyperv_features,
HYPERV_FEAT_XMM_INPUT, 0),
DEFINE_PROP_ON_OFF_AUTO("hv-no-nonarch-coresharing", X86CPU,
hyperv_no_nonarch_cs, ON_OFF_AUTO_OFF),
DEFINE_PROP_BIT64("hv-syndbg", X86CPU, hyperv_features,

1
target/i386/cpu.h
View File

@ -1107,6 +1107,7 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
#define HYPERV_FEAT_AVIC 15
#define HYPERV_FEAT_SYNDBG 16
#define HYPERV_FEAT_MSR_BITMAP 17
#define HYPERV_FEAT_XMM_INPUT 18
#ifndef HYPERV_SPINLOCK_NEVER_NOTIFY
#define HYPERV_SPINLOCK_NEVER_NOTIFY 0xFFFFFFFF

2
target/i386/kvm/hyperv-proto.h
View File

@ -54,7 +54,7 @@
#define HV_GUEST_DEBUGGING_AVAILABLE (1u << 1)
#define HV_PERF_MONITOR_AVAILABLE (1u << 2)
#define HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE (1u << 3)
#define HV_HYPERCALL_PARAMS_XMM_AVAILABLE (1u << 4)
#define HV_HYPERCALL_XMM_INPUT_AVAILABLE (1u << 4)
#define HV_GUEST_IDLE_STATE_AVAILABLE (1u << 5)
#define HV_FREQUENCY_MSRS_AVAILABLE (1u << 8)
#define HV_GUEST_CRASH_MSR_AVAILABLE (1u << 10)

7
target/i386/kvm/kvm.c
View File

@ -980,6 +980,13 @@ static struct {
.bits = HV_NESTED_MSR_BITMAP}
}
},
[HYPERV_FEAT_XMM_INPUT] = {
.desc = "XMM fast hypercall input (hv-xmm-input)",
.flags = {
{.func = HV_CPUID_FEATURES, .reg = R_EDX,
.bits = HV_HYPERCALL_XMM_INPUT_AVAILABLE}
}
},
};
static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max,