Re: [PATCH v3 07/10] arm/kvm: write back modified ID regs to KVM

[Cornelia Huck <cohuck@redhat.com>]

On Tue, Apr 15 2025, Philippe Mathieu-Daudé <philmd@linaro.org> wrote:

> On 14/4/25 18:38, Cornelia Huck wrote:
>> From: Eric Auger <eric.auger@redhat.com>
>> 
>> We want to give a chance to override the value of host ID regs.
>> In a previous patch we made sure all their values could be fetched
>> through kvm_get_one_reg() calls before their modification. After
>> their potential modification we need to make sure we write back
>> the values through kvm_set_one_reg() calls.
>> 
>> Make sure the cpreg_list is modified with updated values and
>> transfer those values back to kvm.
>> 
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
>> ---
>>   target/arm/kvm.c        | 44 ++++++++++++++++++++++++++++++++++++++++-
>>   target/arm/trace-events |  1 +
>>   2 files changed, 44 insertions(+), 1 deletion(-)
>
>
>>   void kvm_arm_reset_vcpu(ARMCPU *cpu)
>>   {
>>       int ret;
>> @@ -2050,7 +2083,16 @@ int kvm_arch_init_vcpu(CPUState *cs)
>>       }
>>       cpu->mp_affinity = mpidr & ARM64_AFFINITY_MASK;
>>   
>> -    return kvm_arm_init_cpreg_list(cpu);
>> +    ret = kvm_arm_init_cpreg_list(cpu);
>> +    if (ret) {
>> +        return ret;
>> +    }
>> +    /* overwrite writable ID regs with their updated property values */
>> +    kvm_arm_writable_idregs_to_cpreg_list(cpu);
>> +
>> +    write_list_to_kvmstate(cpu, 3);
>
> s/3/KVM_PUT_FULL_STATE/?

Indeed, that's more obvious. Thanks!