From: Xiaoyao Li <xiaoyao...@intel.com> It gets below warning when booting TDX VMs:
warning: TDX forcibly sets the feature: CPUID[eax=01h].ECX.pdcm [bit 15] Because CPUID_EXT_PDCM is fixed1 for TDX, and MSR_IA32_PERF_CAPABILITIES is supported for TDX guest unconditioanlly. Don't mask off CPUID_EXT_PDCM for TDX. Signed-off-by: Xiaoyao Li <xiaoyao...@intel.com> Reviewed-by: Zhao Liu <zhao1....@intel.com> Link: https://lore.kernel.org/r/20250625035710.2770679-1-xiaoyao...@intel.com Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- target/i386/cpu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index b768838b100..f9e6bc8d0e6 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -28,6 +28,7 @@ #include "system/hvf.h" #include "hvf/hvf-i386.h" #include "kvm/kvm_i386.h" +#include "kvm/tdx.h" #include "sev.h" #include "qapi/error.h" #include "qemu/error-report.h" @@ -8336,7 +8337,8 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **errp) } } - if (!cpu->enable_pmu) { + /* PDCM is fixed1 bit for TDX */ + if (!cpu->enable_pmu && !is_tdx_vm()) { mark_unavailable_features(cpu, FEAT_1_ECX, env->user_features[FEAT_1_ECX] & CPUID_EXT_PDCM, "This feature is not available due to PMU being disabled"); -- 2.50.0
