Alex Williamson <alex.williamson@xxxxxxxxxx> writes: > The latest Nvidia driver (337.88) specifically checks for KVM as the > hypervisor and reports Code 43 for the driver in a Windows guest when > found. Removing or changing the KVM signature is sufficient for the > driver to load and work. This patch adds an option to easily allow > the KVM hypervisor signature to be hidden using '-cpu kvm=off'. We > continue to expose KVM via the cpuid value by default. The state of > this option does not supercede or replace -enable-kvm or the accel=kvm > machine option. This only changes the visibility of KVM to the guest > and paravirtual features specifically tied to the KVM cpuid. > > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > --- > target-i386/cpu-qom.h | 1 + > target-i386/cpu.c | 1 + > target-i386/kvm.c | 28 +++++++++++++++------------- > 3 files changed, 17 insertions(+), 13 deletions(-) > > diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h > index e9b3d57..0808cfc 100644 > --- a/target-i386/cpu-qom.h > +++ b/target-i386/cpu-qom.h > @@ -87,6 +87,7 @@ typedef struct X86CPU { > bool hyperv_time; > bool check_cpuid; > bool enforce_cpuid; > + bool expose_kvm; > > /* if true the CPUID code directly forward host cache leaves to the guest */ > bool cache_info_passthrough; > diff --git a/target-i386/cpu.c b/target-i386/cpu.c > index 042a48d..cbf1d97 100644 > --- a/target-i386/cpu.c > +++ b/target-i386/cpu.c > @@ -2792,6 +2792,7 @@ static Property x86_cpu_properties[] = { > DEFINE_PROP_BOOL("hv-time", X86CPU, hyperv_time, false), > DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, false), > DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false), > + DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true), > DEFINE_PROP_END_OF_LIST() > }; > > diff --git a/target-i386/kvm.c b/target-i386/kvm.c > index 0d894ef..b2295d2 100644 > --- a/target-i386/kvm.c > +++ b/target-i386/kvm.c > @@ -528,23 +528,25 @@ int kvm_arch_init_vcpu(CPUState *cs) > has_msr_hv_hypercall = true; > } > > - memcpy(signature, "KVMKVMKVM\0\0\0", 12); > - c = &cpuid_data.entries[cpuid_i++]; > - c->function = KVM_CPUID_SIGNATURE | kvm_base; > - c->eax = 0; > - c->ebx = signature[0]; > - c->ecx = signature[1]; > - c->edx = signature[2]; > + if (cpu->expose_kvm) { > + memcpy(signature, "KVMKVMKVM\0\0\0", 12); > + c = &cpuid_data.entries[cpuid_i++]; > + c->function = KVM_CPUID_SIGNATURE | kvm_base; > + c->eax = 0; > + c->ebx = signature[0]; > + c->ecx = signature[1]; > + c->edx = signature[2]; > > - c = &cpuid_data.entries[cpuid_i++]; > - c->function = KVM_CPUID_FEATURES | kvm_base; > - c->eax = env->features[FEAT_KVM]; > + c = &cpuid_data.entries[cpuid_i++]; > + c->function = KVM_CPUID_FEATURES | kvm_base; > + c->eax = env->features[FEAT_KVM]; > > - has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF); > + has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF); > > - has_msr_pv_eoi_en = c->eax & (1 << KVM_FEATURE_PV_EOI); > + has_msr_pv_eoi_en = c->eax & (1 << KVM_FEATURE_PV_EOI); > > - has_msr_kvm_steal_time = c->eax & (1 << KVM_FEATURE_STEAL_TIME); > + has_msr_kvm_steal_time = c->eax & (1 << KVM_FEATURE_STEAL_TIME); Does this mean that we don't expose these features if kvm=off is specified ? > + } > > cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html