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i386: Hyper-V Support extended GVA ranges for TLB flush hypercalls

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KVM kind of supported "extended GVA ranges" (up to 4095 additional GFNs
per hypercall) since the implementation of Hyper-V PV TLB flush feature
(Linux-4.18) as regardless of the request, full TLB flush was always
performed. "Extended GVA ranges for TLB flush hypercalls" feature bit
wasn't exposed then. Now, as KVM gains support for fine-grained TLB
flush handling, exposing this feature starts making sense.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220525115949.1294004-5-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-05-25 13:59:47 +02:00 committed by Paolo Bonzini
parent 9411e8b6fa
commit aa6bb5fad5
5 changed files with 19 additions and 0 deletions
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7
docs/hyperv.txt
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@ -255,6 +255,13 @@ 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.
3.24. hv-tlbflush-ext
=====================
Allow for extended GVA ranges to be passed to Hyper-V TLB flush hypercalls
(HvFlushVirtualAddressList/HvFlushVirtualAddressListEx).
Requires: hv-tlbflush
4. Supplementary features
=========================

2
target/i386/cpu.c
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@ -6972,6 +6972,8 @@ static Property x86_cpu_properties[] = {
HYPERV_FEAT_MSR_BITMAP, 0),
DEFINE_PROP_BIT64("hv-xmm-input", X86CPU, hyperv_features,
HYPERV_FEAT_XMM_INPUT, 0),
DEFINE_PROP_BIT64("hv-tlbflush-ext", X86CPU, hyperv_features,
HYPERV_FEAT_TLBFLUSH_EXT, 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
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@ -1108,6 +1108,7 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
#define HYPERV_FEAT_SYNDBG 16
#define HYPERV_FEAT_MSR_BITMAP 17
#define HYPERV_FEAT_XMM_INPUT 18
#define HYPERV_FEAT_TLBFLUSH_EXT 19
#ifndef HYPERV_SPINLOCK_NEVER_NOTIFY
#define HYPERV_SPINLOCK_NEVER_NOTIFY 0xFFFFFFFF

1
target/i386/kvm/hyperv-proto.h
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@ -59,6 +59,7 @@
#define HV_FREQUENCY_MSRS_AVAILABLE (1u << 8)
#define HV_GUEST_CRASH_MSR_AVAILABLE (1u << 10)
#define HV_FEATURE_DEBUG_MSRS_AVAILABLE (1u << 11)
#define HV_EXT_GVA_RANGES_FLUSH_AVAILABLE (1u << 14)
#define HV_STIMER_DIRECT_MODE_AVAILABLE (1u << 19)
/*

8
target/i386/kvm/kvm.c
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@ -987,6 +987,14 @@ static struct {
.bits = HV_HYPERCALL_XMM_INPUT_AVAILABLE}
}
},
[HYPERV_FEAT_TLBFLUSH_EXT] = {
.desc = "Extended gva ranges for TLB flush hypercalls (hv-tlbflush-ext)",
.flags = {
{.func = HV_CPUID_FEATURES, .reg = R_EDX,
.bits = HV_EXT_GVA_RANGES_FLUSH_AVAILABLE}
},
.dependencies = BIT(HYPERV_FEAT_TLBFLUSH)
},
};
static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max,