Re: [PATCH v1 2/9] target/i386: Hide Intel cache CPUID leaves for Hygon

On Mon, Jul 06, 2026 at 01:55:23PM +0800, [email protected] wrote:
> Date: Mon,  6 Jul 2026 13:55:23 +0800
> From: [email protected]
> Subject: [PATCH v1 2/9] target/i386: Hide Intel cache CPUID leaves for Hygon
> X-Mailer: git-send-email 2.43.7
> 
> From: Tina Zhang <[email protected]>
> 
> 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 Hygon
> vendor ABI fixes are enabled.  The property keeps the old CPUID output
> for pc-11.0 and older machine types.
> 
> Signed-off-by: Tina Zhang <[email protected]>
> ---
>  target/i386/cpu.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)

Reviewed-by: Zhao Liu <[email protected]>