From: Paolo Bonzini <pbonzini@redhat.com>
To: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [PATCH] i386/tdx: Don't mask off CPUID_EXT_PDCM
Date: Fri, 11 Jul 2025 10:58:32 +0200 [thread overview]
Message-ID: <20250711085831.459772-2-pbonzini@redhat.com> (raw)
In-Reply-To: <20250625035710.2770679-1-xiaoyao.li@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.
It makes little sense for the TDX module to do this, but I don't see
any nicer way to comply. :(
Queued, thanks.
Paolo
prev parent reply other threads:[~2025-07-11 9:05 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
2025-07-11 8:58 ` Paolo Bonzini [this message]
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