Re: [Xen-devel] [PATCH RFC 13/15] libxc: arm64 vcpu initialisation

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 10/07/2013 05:39 PM, Ian Campbell wrote:
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
>  tools/libxc/xc_dom_arm.c |   90 
> ++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 88 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
> index ecdaea9..a6d2259 100644
> --- a/tools/libxc/xc_dom_arm.c
> +++ b/tools/libxc/xc_dom_arm.c
> @@ -105,7 +105,7 @@ static int shared_info_arm(struct xc_dom_image *dom, void 
> *ptr)
>  
>  /* ------------------------------------------------------------------------ 
> */
>  
> -static int vcpu_arm(struct xc_dom_image *dom, void *ptr)
> +static int vcpu_arm32(struct xc_dom_image *dom, void *ptr)
>  {
>      vcpu_guest_context_t *ctxt = ptr;
>  
> @@ -143,6 +143,41 @@ static int vcpu_arm(struct xc_dom_image *dom, void *ptr)
>      return 0;
>  }
>  
> +static int vcpu_arm64(struct xc_dom_image *dom, void *ptr)
> +{
> +    vcpu_guest_context_t *ctxt = ptr;
> +
> +    DOMPRINTF_CALLED(dom->xch);
> +    /* clear everything */
> +    memset(ctxt, 0, sizeof(*ctxt));
> +
> +    ctxt->user_regs.pc64 = dom->parms.virt_entry;
> +
> +    /* Linux boot protocol. See linux.Documentation/arm/Booting. */
> +    ctxt->user_regs.x0 = dom->devicetree_blob ?
> +        dom->devicetree_seg.vstart : 0xffffffff;
> +    ctxt->user_regs.x1 = 0;
> +    ctxt->user_regs.x2 = 0;
> +    ctxt->user_regs.x3 = 0;
> +
> +    DOMPRINTF("DTB %"PRIx64, ctxt->user_regs.x0);
> +
> +    ctxt->sctlr = /* #define SCTLR_BASE */0x00c50078;
> +
> +    ctxt->ttbr0 = 0;
> +    ctxt->ttbr1 = 0;
> +    ctxt->ttbcr = 0; /* Defined Reset Value */
> +
> +    ctxt->user_regs.cpsr = 
> PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK|PSR_MODE_EL1h;

PSR_MODE_EL1h is only defined on arm64. I think you will need to prefix
all the code by #ifdef __aarch64__

BTW, can you use PSR_GUEST64_INIT here? So if we modified it in Xen, the
behaviour will also change here.

-- 
Julien Grall

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