On 30/01/19 00:52, Luwei Kang wrote:
> Intel Processor Trace required CPUID[0x14] but the cpuid_level
> have no change when create a kvm guest with
> e.g. "-cpu qemu64,+intel-pt".
>
> Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
> Signed-off-by: Luwei Kang <luwei.k...@intel.com>
> ---
> hw/i386/pc.c | 1 +
> target/i386/cpu.c | 9 +++++++++
> target/i386/cpu.h | 3 +++
> 3 files changed, 13 insertions(+)
>
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 73d688f..72a0a70 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -122,6 +122,7 @@ GlobalProperty pc_compat_3_1[] = {
> { "Cascadelake-Server" "-" TYPE_X86_CPU, "mpx", "on" },
> { "Icelake-Client" "-" TYPE_X86_CPU, "mpx", "on" },
> { "Icelake-Server" "-" TYPE_X86_CPU, "mpx", "on" },
> + { TYPE_X86_CPU, "x-intel-pt-auto-level", "off" },
> };
> const size_t pc_compat_3_1_len = G_N_ELEMENTS(pc_compat_3_1);
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 2f54125..6dddd99 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -5023,6 +5023,13 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error
> **errp)
> x86_cpu_adjust_feat_level(cpu, FEAT_C000_0001_EDX);
> x86_cpu_adjust_feat_level(cpu, FEAT_SVM);
> x86_cpu_adjust_feat_level(cpu, FEAT_XSAVE);
> +
> + /* Intel Processor Trace requires CPUID[0x14] */
> + if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT) &&
> + kvm_enabled() && cpu->intel_pt_auto_level) {
> + x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
> + }
> +
> /* SVM requires CPUID[0x8000000A] */
> if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
> x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000000A);
> @@ -5816,6 +5823,8 @@ static Property x86_cpu_properties[] = {
> DEFINE_PROP_INT32("x-hv-max-vps", X86CPU, hv_max_vps, -1),
> DEFINE_PROP_BOOL("x-hv-synic-kvm-only", X86CPU, hyperv_synic_kvm_only,
> false),
> + DEFINE_PROP_BOOL("x-intel-pt-auto-level", X86CPU, intel_pt_auto_level,
> + true),
> DEFINE_PROP_END_OF_LIST()
> };
>
> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
> index 59656a7..090baa4 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -1455,6 +1455,9 @@ struct X86CPU {
> /* Enable auto level-increase for all CPUID leaves */
> bool full_cpuid_auto_level;
>
> + /* Enable auto level-increase for Intel Processor Trace leave */
> + bool intel_pt_auto_level;
> +
> /* if true fill the top bits of the MTRR_PHYSMASKn variable range */
> bool fill_mtrr_mask;
>
>
Eduardo is back, but I've queued this anyway.
Thanks,
Paolo
