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Re: [PATCH 5/7] arm64/kvm: hyp: tlb: use __tlbi() helper

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  Re: [PATCH 5/7] arm64/kvm: hyp: tlb: use __tlbi() helper Matthias Brugger <mbrugger@suse.com> - 2016-10-05 18:50 +0200
    Re: [PATCH 5/7] arm64/kvm: hyp: tlb: use __tlbi() helper Punit Agrawal <punit.agrawal@arm.com> - 2016-10-06 11:50 +0200

#1495961 — Re: [PATCH 5/7] arm64/kvm: hyp: tlb: use __tlbi() helper

On 13/09/16 12:16, Punit Agrawal wrote:
> From: Mark Rutland <mark.rutland@arm.com>
>
> Now that we have a __tlbi() helper, make use of this in the arm64 KVM hyp
> code to get rid of asm() boilerplate. At the same time, we simplify
> __tlb_flush_vm_context by using __flush_icache_all(), as this has the
> appropriate instruction cache maintenance and barrier.
>
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> [ rename tlbi -> __tlbi, convert additional sites, update commit log ]
> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
> ---

Reviewed-by: Matthias Brugger <mbrugger@suse.com>

>  arch/arm64/kvm/hyp/tlb.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c
> index be8177c..4cda100 100644
> --- a/arch/arm64/kvm/hyp/tlb.c
> +++ b/arch/arm64/kvm/hyp/tlb.c
> @@ -16,6 +16,7 @@
>   */
>
>  #include <asm/kvm_hyp.h>
> +#include <asm/tlbflush.h>
>
>  static void __hyp_text __tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
>  {
> @@ -32,7 +33,7 @@ static void __hyp_text __tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
>  	 * whole of Stage-1. Weep...
>  	 */
>  	ipa >>= 12;
> -	asm volatile("tlbi ipas2e1is, %0" : : "r" (ipa));
> +	__tlbi(ipas2e1is, ipa);
>
>  	/*
>  	 * We have to ensure completion of the invalidation at Stage-2,
> @@ -41,7 +42,7 @@ static void __hyp_text __tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
>  	 * the Stage-1 invalidation happened first.
>  	 */
>  	dsb(ish);
> -	asm volatile("tlbi vmalle1is" : : );
> +	__tlbi(vmalle1is);
>  	dsb(ish);
>  	isb();
>
> @@ -60,7 +61,7 @@ static void __hyp_text __tlb_flush_vmid(struct kvm *kvm)
>  	write_sysreg(kvm->arch.vttbr, vttbr_el2);
>  	isb();
>
> -	asm volatile("tlbi vmalls12e1is" : : );
> +	__tlbi(vmalls12e1is);
>  	dsb(ish);
>  	isb();
>
> @@ -72,9 +73,8 @@ __alias(__tlb_flush_vmid) void __kvm_tlb_flush_vmid(struct kvm *kvm);
>  static void __hyp_text __tlb_flush_vm_context(void)
>  {
>  	dsb(ishst);
> -	asm volatile("tlbi alle1is	\n"
> -		     "ic ialluis	  ": : );
> -	dsb(ish);
> +	__tlbi(alle1is);
> +	__flush_icache_all(); /* contains a dsb(ish) */
>  }
>
>  __alias(__tlb_flush_vm_context) void __kvm_flush_vm_context(void);
>

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#1496523

Matthias Brugger <mbrugger@suse.com> writes:

> On 13/09/16 12:16, Punit Agrawal wrote:
>> From: Mark Rutland <mark.rutland@arm.com>
>>
>> Now that we have a __tlbi() helper, make use of this in the arm64 KVM hyp
>> code to get rid of asm() boilerplate. At the same time, we simplify
>> __tlb_flush_vm_context by using __flush_icache_all(), as this has the
>> appropriate instruction cache maintenance and barrier.
>>
>> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>> [ rename tlbi -> __tlbi, convert additional sites, update commit log ]
>> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
>> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
>> ---
>
> Reviewed-by: Matthias Brugger <mbrugger@suse.com>

Thanks for reviewing the patch. I'll re-spin a new version with the tag
after the merge window.

Punit


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