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Re: [PATCH] x86/APIC: Drop APIC_BASE and use fix_to_virt()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 30 Jul 2024 13:21:27 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 30 Jul 2024 12:21:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30/07/2024 1:20 pm, Jan Beulich wrote:
> On 30.07.2024 14:17, Andrew Cooper wrote:
>> Right now the apic_mem_*() helpers only compile because sizeof(void *) ==
>> sizeof(long long). Switch to using fix_to_virt() which is a void *type.
>>
>> Also adjust the two places where the APIC/IO-APIC virtual address is rendered
>> in a printk().
>>
>> No functional change.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> ideally ...
>
>> --- a/xen/arch/x86/include/asm/apic.h
>> +++ b/xen/arch/x86/include/asm/apic.h
>> @@ -51,12 +51,16 @@ const struct genapic *apic_x2apic_probe(void);
>>
>> static inline void apic_mem_write(unsigned int reg, uint32_t v)
>> {
>> - *((volatile u32 *)(APIC_BASE+reg)) = v;
>> + volatile uint32_t *addr = fix_to_virt(FIX_APIC_BASE) + reg;
>> +
>> + *addr = v;
>> }
>>
>> -static inline u32 apic_mem_read(unsigned int reg)
>> +static inline uint32_t apic_mem_read(unsigned int reg)
>> {
>> - return *((volatile u32 *)(APIC_BASE+reg));
>> + volatile uint32_t *addr = fix_to_virt(FIX_APIC_BASE) + reg;
> ... with const added here.
Oops yes. Will fix. Thanks.
~Andrew
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