Re: [PATCH v2 2/9] target/i386: Hide Intel cache CPUID leaves for Hygon

On Mon, Aug 10, 2026 at 04:29:49PM +0800, Tina Zhang wrote:
> Date: Mon, 10 Aug 2026 16:29:49 +0800
> From: Tina Zhang <[email protected]>
> Subject: [PATCH v2 2/9] target/i386: Hide Intel cache CPUID leaves for Hygon
> X-Mailer: git-send-email 2.43.7
> 
> When x-vendor-cpuid-only is enabled, QEMU suppresses CPUID leaves 2
> and 4 for AuthenticAMD CPUs because those leaves describe Intel cache
> information.  Hygon Dhyana uses the HygonGenuine vendor string, so it
> currently skips that filtering and can expose Intel cache leaves together
> with AMD/Hygon extended cache leaves.
> 
> That is inconsistent guest-visible CPUID: Hygon Dhyana provides cache
> information through the extended cache leaves, so it should not also
> advertise the Intel cache descriptor and deterministic cache parameter
> leaves.
> 
> Apply the same leaf 2 and leaf 4 filtering to Hygon CPUs when the vendor
> CPU ABI compat gate is enabled.  The gate keeps the old CPUID output for
> pc-11.0 and older machine types.

nit: pc-11.1?

Thanks,
Zhao