Re: [PATCH v15 16/17] hvf: arm: disable SME when nested virt is active

[Mohamed Mediouni]

> On 6. Mar 2026, at 14:32, Peter Maydell <peter.mayd...@linaro.org> wrote:
> 
> On Fri, 6 Mar 2026 at 13:02, Mohamed Mediouni <moha...@unpredictable.fr> 
> wrote:
>> 
>> Currently, Apple doesn't support the nested virtualisation + SME combination.
>> 
>> Signed-off-by: Mohamed Mediouni <moha...@unpredictable.fr>
>> ---
>> target/arm/hvf/hvf.c | 3 +++
>> target/arm/hvf_arm.h | 5 +++++
>> 2 files changed, 8 insertions(+)
>> 
>> diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
>> index 0183dd8a60..61ba5acce4 100644
>> --- a/target/arm/hvf/hvf.c
>> +++ b/target/arm/hvf/hvf.c
>> @@ -1181,6 +1181,9 @@ static bool 
>> hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
>> 
>>     if (hvf_nested_virt_enabled()) {
>>         FIELD_DP64_IDREG(&host_isar, ID_AA64DFR0, PMUVER, 0x1);
>> +        /* SME is not implemented with nested virt on the Apple side */
>> +        SET_IDREG(&host_isar, ID_AA64PFR1,
>> +              GET_IDREG(&host_isar, ID_AA64PFR1) & ~R_ID_AA64PFR1_SME_MASK);
> 
> This is
>  FIELD_DP64_IDREG(&host_isar, ID_AA64PFR1, SME, 0);
> 
> isn't it?
> 
Hi,

That's an equivalent sequence indeed. Should I respin for this?

Thank you,
> 
> thanks
> -- PMM