Re: [Xen-devel] [PATCH v2 01/10] xen/arm64: Added handling of the trapped access to OSLSR register

[Julien Grall <julien.grall@xxxxxxx>]

Hi Mirela,

On 20/04/18 13:25, Mirela Simonovic wrote:
> Linux/dom0 accesses OSLSR register when saving CPU context during the
> suspend procedure. Xen traps access to this register, but has no handling
> for it. Consequently, Xen injects undef exception to linux, causing it to
> crash. This patch adds handling of the trapped access to OSLSR as ro/raz.
>
> Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

> ---
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
> ---
> Changes in v2:
> - Commit message fix (arm64 related change instead of arm)
> - Add Stefano's reviewed-by
> ---
>   xen/arch/arm/arm64/vsysreg.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/arm64/vsysreg.c b/xen/arch/arm/arm64/vsysreg.c
> index c57ac12503..8f80e1735e 100644
> --- a/xen/arch/arm/arm64/vsysreg.c
> +++ b/xen/arch/arm/arm64/vsysreg.c
> @@ -57,13 +57,14 @@ void do_sysreg(struct cpu_user_regs *regs,
>        * ARMv8 (DDI 0487A.d): D1-1509 Table D1-58
>        *
>        * Unhandled:
> -     *    OSLSR_EL1
>        *    DBGPRCR_EL1
>        */
>       case HSR_SYSREG_OSLAR_EL1:
>           return handle_wo_wi(regs, regidx, hsr.sysreg.read, hsr, 1);
>       case HSR_SYSREG_OSDLR_EL1:
>           return handle_raz_wi(regs, regidx, hsr.sysreg.read, hsr, 1);
> +    case HSR_SYSREG_OSLSR_EL1:
> +        return handle_ro_raz(regs, regidx, hsr.sysreg.read, hsr, 1);
>   
>       /*
>        * MDCR_EL2.TDA
--
Julien Grall

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