On Fri, Sep 04, 2020 at 04:54:15PM +0200, Vitaly Kuznetsov wrote:
> As a preparation to expanding Hyper-V CPU features early, move
> hyperv_limits initialization to x86_cpu_realizefn().
>
> Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
> ---
> target/i386/cpu.c | 5 +++++
> target/i386/cpu.h | 1 +
> target/i386/kvm.c | 13 ++++++++++++-
> 3 files changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index e605399eb8c0..ef3c672cf415 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -6648,6 +6648,11 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
> **errp)
> cpu->hyperv_version_id[0] = 0x00001bbc;
> cpu->hyperv_version_id[1] = 0x00060001;
>
> + /* Hypervisor implementation limits */
> + cpu->hyperv_limits[0] = 64;
> + cpu->hyperv_limits[1] = 0;
> + cpu->hyperv_limits[2] = 0;
> +
> if (cpu->ucode_rev == 0) {
> /* The default is the same as KVM's. */
> if (IS_AMD_CPU(env)) {
> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
> index 2630ffd2d4b2..095d0bf75493 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -1662,6 +1662,7 @@ struct X86CPU {
> uint32_t hyperv_vendor_id[3];
> uint32_t hyperv_interface_id[4];
> uint32_t hyperv_version_id[4];
> + uint32_t hyperv_limits[3];
>
> bool check_cpuid;
> bool enforce_cpuid;
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index 169bae2779a4..720c30e9df17 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -1253,6 +1253,15 @@ static int hyperv_handle_properties(CPUState *cs,
> env->features[FEAT_HYPERV_EBX] = c->ebx;
> env->features[FEAT_HYPERV_EDX] = c->eax;
> }
> +
> + c = cpuid_find_entry(cpuid, HV_CPUID_IMPLEMENT_LIMITS, 0);
> + if (c) {
> + cpu->hv_max_vps = c->eax;
> + cpu->hyperv_limits[0] = c->ebx;
> + cpu->hyperv_limits[1] = c->ecx;
> + cpu->hyperv_limits[2] = c->edx;
> + }
> +
Sam question I had for vendor id and version id: should it go to
a separate patch as it changes behavior of hv-passthrough?
> c = cpuid_find_entry(cpuid, HV_CPUID_ENLIGHTMENT_INFO, 0);
> if (c) {
> env->features[FEAT_HV_RECOMM_EAX] = c->eax;
> @@ -1355,7 +1364,9 @@ static int hyperv_handle_properties(CPUState *cs,
> c = &cpuid_ent[cpuid_i++];
> c->function = HV_CPUID_IMPLEMENT_LIMITS;
> c->eax = cpu->hv_max_vps;
> - c->ebx = 0x40;
> + c->ebx = cpu->hyperv_limits[0];
> + c->ecx = cpu->hyperv_limits[1];
> + c->edx = cpu->hyperv_limits[2];
>
> if (hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS)) {
> __u32 function;
> --
> 2.25.4
>
--
Eduardo
