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 /target/i386/kvm.c | |
| 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>
Diffstat (limited to 'target/i386/kvm.c')
| -rw-r--r-- | target/i386/kvm.c | 15 |
1 files changed, 14 insertions, 1 deletions
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++]; |