Subject: Re: [PATCH 02/26] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h

From: Marc Zyngier <[email-masked]>
Date: Wed, 22 Apr 2020 14:59:46 +0100

Hi Suzuki,

On 2020-04-22 14:51, Suzuki K Poulose wrote:
> Hi Marc,
> 
> 
> On 04/22/2020 01:00 PM, Marc Zyngier wrote:
>> Having __load_guest_stage2 in kvm_hyp.h is quickly going to trigger
>> a circular include problem. In order to avoid this, let's move
>> it to kvm_mmu.h, where it will be a better fit anyway.
>> 
>> In the process, drop the __hyp_text annotation, which doesn't help
>> as the function is marked as __always_inline.
>> 
>> Signed-off-by: Marc Zyngier <[email-masked]>
> 
>> ---
>>   arch/arm64/include/asm/kvm_hyp.h | 18 ------------------
>>   arch/arm64/include/asm/kvm_mmu.h | 17 +++++++++++++++++
>>   2 files changed, 17 insertions(+), 18 deletions(-)
>> 
>> diff --git a/arch/arm64/include/asm/kvm_hyp.h 
>> b/arch/arm64/include/asm/kvm_hyp.h
>> index fe57f60f06a89..dcb63bf941057 100644
>> --- a/arch/arm64/include/asm/kvm_hyp.h
>> +++ b/arch/arm64/include/asm/kvm_hyp.h
>> @@ -10,7 +10,6 @@
>>   #include <linux/compiler.h>
>>   #include <linux/kvm_host.h>
>>   #include <asm/alternative.h>
>> -#include <asm/kvm_mmu.h>
>>   #include <asm/sysreg.h>
>>     #define __hyp_text __section(.hyp.text) notrace
>> @@ -88,22 +87,5 @@ void deactivate_traps_vhe_put(void);
>>   u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context 
>> *host_ctxt);
>>   void __noreturn __hyp_do_panic(unsigned long, ...);
>>   -/*
>> - * Must be called from hyp code running at EL2 with an updated VTTBR
>> - * and interrupts disabled.
>> - */
>> -static __always_inline void __hyp_text __load_guest_stage2(struct kvm 
>> *kvm)
>> -{
>> -	write_sysreg(kvm->arch.vtcr, vtcr_el2);
>> -	write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
>> -
>> -	/*
>> -	 * ARM errata 1165522 and 1530923 require the actual execution of 
>> the
>> -	 * above before we can switch to the EL1/EL0 translation regime used 
>> by
>> -	 * the guest.
>> -	 */
>> -	asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
>> -}
>> -
>>   #endif /* __ARM64_KVM_HYP_H__ */
>>   diff --git a/arch/arm64/include/asm/kvm_mmu.h 
>> b/arch/arm64/include/asm/kvm_mmu.h
>> index 30b0e8d6b8953..5ba1310639ec6 100644
>> --- a/arch/arm64/include/asm/kvm_mmu.h
>> +++ b/arch/arm64/include/asm/kvm_mmu.h
>> @@ -604,5 +604,22 @@ static __always_inline u64 kvm_get_vttbr(struct 
>> kvm *kvm)
>>   	return kvm_phys_to_vttbr(baddr) | vmid_field | cnp;
>>   }
>>   +/*
>> + * Must be called from hyp code running at EL2 with an updated VTTBR
>> + * and interrupts disabled.
>> + */
>> +static __always_inline void __load_guest_stage2(struct kvm *kvm)
>> +{
>> +	write_sysreg(kvm->arch.vtcr, vtcr_el2);
>> +	write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
>> +
>> +	/*
>> +	 * ARM erratum 1165522 requires the actual execution of the above
> 
> Is it intentional to drop the reference to errata 1530923 ?

No, that's obviously the effect of a bad conflict resolution during a 
rebase.
I'll fix it now, thanks for spotting it.

> Otherwise :
> 
> Reviewed-by: Suzuki K Poulose <[email-masked]>

Cheers,

         M.
-- 
Jazz is not dead. It just smells funny...

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