Re: [Xen-devel] [PATCH v3 09/15] xen: arm: Set EL1 register width in HCR_EL2 during context switch.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 19 Jul 2013, Ian Campbell wrote:
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


> v3: Remove ifdef and rely on is_pv32_domain == true on arm32
> ---
>  xen/arch/arm/domain.c           |    5 +++++
>  xen/include/asm-arm/processor.h |    1 +
>  2 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
> index 70fbc0d..a409d11 100644
> --- a/xen/arch/arm/domain.c
> +++ b/xen/arch/arm/domain.c
> @@ -207,6 +207,11 @@ static void ctxt_switch_to(struct vcpu *n)
>  
>      isb();
>  
> +    if ( is_pv32_domain(n->domain) )
> +        hcr &= ~HCR_RW;
> +    else
> +        hcr |= HCR_RW;
> +
>      WRITE_SYSREG(hcr, HCR_EL2);
>      isb();
>  
> diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
> index 8b9b320..9e4995c 100644
> --- a/xen/include/asm-arm/processor.h
> +++ b/xen/include/asm-arm/processor.h
> @@ -40,6 +40,7 @@
>  #define PSR_GUEST_INIT  (PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK)
>  
>  /* HCR Hyp Configuration Register */
> +#define HCR_RW          (1<<31) /* ARM64 only */
>  #define HCR_TGE         (1<<27)
>  #define HCR_TVM         (1<<26)
>  #define HCR_TTLB        (1<<25)
> -- 
> 1.7.2.5
> 

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