Re: [PATCH] x86/svm: Fold nsvm_{wr,rd}msr() into svm_msr_{read,write}_intercept()

[Jan Beulich <jbeulich@xxxxxxxx>]

On 22.07.2020 11:26, Roger Pau Monné wrote:
> On Tue, Jul 21, 2020 at 06:22:08PM +0100, Andrew Cooper wrote:
>> @@ -2085,6 +2091,22 @@ static int svm_msr_write_intercept(unsigned int msr, 
>> uint64_t msr_content)
>>              goto gpf;
>>          break;
>>  
>> +    case MSR_K8_VM_CR:
>> +        /* ignore write. handle all bits as read-only. */
>> +        break;
>> +
>> +    case MSR_K8_VM_HSAVE_PA:
>> +        if ( (msr_content & ~PAGE_MASK) || msr_content > 0xfd00000000ULL )
> 
> Regarding the address check, the PM states "the maximum supported
> physical address for this implementation", but I don't seem to be able
> to find where is this actually announced.

I think you'd typically find this information in the BKDG or PPR only.
The PM is generic, while the named two are specific to particular
families or even just models.

Jan