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Re: [Xen-devel] [PATCH 5/6] x86/msr: Clean up the MSR_APIC_BASE constants
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 27 Jun 2018 14:35:04 +0100
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- Delivery-date: Wed, 27 Jun 2018 13:35:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 27/06/18 14:32, Roger Pau Monné wrote:
> On Tue, Jun 26, 2018 at 02:18:17PM +0100, Andrew Cooper wrote:
>> We currently have MSR_IA32_APICBASE and MSR_IA32_APICBASE_MSR which are
>> synonymous from a naming point of view, but refer to very different
>> things.
>>
>> Cleave out the handling of MSR_APIC_BASE (0x1b), and rename
>> MSR_IA32_APICBASE_BASE to APIC_BASE_ADDR_MASK to better describe its
>> purpose.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
>> diff --git a/xen/arch/x86/apic.c b/xen/arch/x86/apic.c
>> index ffa5a69..aa677e0 100644
>> --- a/xen/arch/x86/apic.c
>> +++ b/xen/arch/x86/apic.c
>> @@ -1446,23 +1448,21 @@ void __init record_boot_APIC_mode(void)
>> apic_mode_to_str(apic_boot_mode));
>> }
>>
>> -/* Look at the bits in MSR_IA32_APICBASE and work out which
>> - * APIC mode we are in */
>> +/* Look at the bits in MSR_APIC_BASE and work out which APIC mode we are in
>> */
>> enum apic_mode current_local_apic_mode(void)
>> {
>> u64 msr_contents;
>>
>> - rdmsrl(MSR_IA32_APICBASE, msr_contents);
>> + rdmsrl(MSR_APIC_BASE, msr_contents);
>>
>> /* Reading EXTD bit from the MSR is only valid if CPUID
>> * says so, else reserved */
>> - if ( boot_cpu_has(X86_FEATURE_X2APIC)
>> - && (msr_contents & MSR_IA32_APICBASE_EXTD) )
>> + if ( boot_cpu_has(X86_FEATURE_X2APIC) && (msr_contents &
>> APIC_BASE_EXTD) )
> While there you could change it to cpu_has_x2apic.
So I can. Thanks,
~Andrew
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