From: Zhao Liu <zhao1.liu@intel.com>
To: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [PATCH] i386/tdx: Don't mask off CPUID_EXT_PDCM
Date: Fri, 27 Jun 2025 16:44:03 +0800 [thread overview]
Message-ID: <aF5Z02o1BFDZSqLS@intel.com> (raw)
In-Reply-To: <20250625035710.2770679-1-xiaoyao.li@intel.com>
On Wed, Jun 25, 2025 at 11:57:10AM +0800, Xiaoyao Li wrote:
> Date: Wed, 25 Jun 2025 11:57:10 +0800
> From: Xiaoyao Li <xiaoyao.li@intel.com>
> Subject: [PATCH] i386/tdx: Don't mask off CPUID_EXT_PDCM
> X-Mailer: git-send-email 2.43.0
>
> 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.li@intel.com>
> ---
> target/i386/cpu.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
next prev parent reply other threads:[~2025-06-27 8:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-25 3:57 [PATCH] i386/tdx: Don't mask off CPUID_EXT_PDCM Xiaoyao Li
2025-06-27 8:44 ` Zhao Liu [this message]
2025-07-11 8:58 ` Paolo Bonzini
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