diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-06-10 20:49:27 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-07-02 14:45:23 +0200 |
| commit | 475120099d446fe106ad970a225327990d747a61 (patch) | |
| tree | 1baae080e5cbdeb654bd2ea21b97f1792fe26c4c | |
| parent | 646f34fa5482e495483de230b4cf0f2ae4fd2781 (diff) | |
i386/kvm: add support for Hyper-V TLB flush
Add support for Hyper-V TLB flush which recently got added to KVM.
Just like regular Hyper-V we announce HV_EX_PROCESSOR_MASKS_RECOMMENDED
regardless of how many vCPUs we have. Windows is 'smart' and uses less
expensive non-EX Hypercall whenever possible (when it wants to flush TLB
for all vCPUs or the maximum vCPU index in the vCPU set requires flushing
is less than 64).
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20180610184927.19309-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target/i386/cpu.c | 1 | ||||
| -rw-r--r-- | target/i386/cpu.h | 1 | ||||
| -rw-r--r-- | target/i386/hyperv-proto.h | 1 | ||||
| -rw-r--r-- | target/i386/kvm.c | 15 |
4 files changed, 17 insertions, 1 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 1e6a7d0a75..d57f3104e1 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5415,6 +5415,7 @@ static Property x86_cpu_properties[] = { DEFINE_PROP_BOOL("hv-stimer", X86CPU, hyperv_stimer, false), 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("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 8eaefeee3e..8b1ddfe932 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1367,6 +1367,7 @@ struct X86CPU { bool hyperv_stimer; bool hyperv_frequencies; bool hyperv_reenlightenment; + bool hyperv_tlbflush; bool check_cpuid; bool enforce_cpuid; bool expose_kvm; diff --git a/target/i386/hyperv-proto.h b/target/i386/hyperv-proto.h index 93352ebd2a..d6d5a79293 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_EX_PROCESSOR_MASKS_RECOMMENDED (1u << 11) /* * Basic virtualized MSRs diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 032f0ad2fc..ebb2d23aa4 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -601,7 +601,8 @@ static bool hyperv_enabled(X86CPU *cpu) cpu->hyperv_runtime || cpu->hyperv_synic || cpu->hyperv_stimer || - cpu->hyperv_reenlightenment); + cpu->hyperv_reenlightenment || + cpu->hyperv_tlbflush); } static int kvm_arch_set_tsc_khz(CPUState *cs) @@ -839,6 +840,18 @@ int kvm_arch_init_vcpu(CPUState *cs) if (cpu->hyperv_vapic) { c->eax |= HV_APIC_ACCESS_RECOMMENDED; } + if (cpu->hyperv_tlbflush) { + if (kvm_check_extension(cs->kvm_state, + KVM_CAP_HYPERV_TLBFLUSH) <= 0) { + fprintf(stderr, "Hyper-V TLB flush support " + "(requested by 'hv-tlbflush' cpu flag) " + " is not supported by kernel\n"); + return -ENOSYS; + } + c->eax |= HV_REMOTE_TLB_FLUSH_RECOMMENDED; + c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED; + } + c->ebx = cpu->hyperv_spinlock_attempts; c = &cpuid_data.entries[cpuid_i++]; |