[RFC][KVM][PATCH 1/1] kvm:ppc:booke-64: soft-disable interrupts

[tiejun.chen]

On 05/06/2013 11:10 AM, Tiejun Chen wrote:
> For the external interrupt, the decrementer exception and the doorbell
> excpetion, we also need to soft-disable interrupts while doing as host
> interrupt handlers since the DO_KVM hook is always performed to skip
> EXCEPTION_COMMON then miss this original chance with the 'ints' (INTS_DISABLE).

Sorry, miss to send Ben.

Tiejun

>
> Signed-off-by: Tiejun Chen <tiejun.chen at windriver.com>
> ---
>   arch/powerpc/kvm/bookehv_interrupts.S |    9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
> index e8ed7d6..2fd62bf 100644
> --- a/arch/powerpc/kvm/bookehv_interrupts.S
> +++ b/arch/powerpc/kvm/bookehv_interrupts.S
> @@ -33,6 +33,8 @@
>
>   #ifdef CONFIG_64BIT
>   #include <asm/exception-64e.h>
> +#include <asm/hw_irq.h>
> +#include <asm/irqflags.h>
>   #else
>   #include "../kernel/head_booke.h" /* for THREAD_NORMSAVE() */
>   #endif
> @@ -469,6 +471,13 @@ _GLOBAL(kvmppc_resume_host)
>   	PPC_LL	r3, HOST_RUN(r1)
>   	mr	r5, r14 /* intno */
>   	mr	r14, r4 /* Save vcpu pointer. */
> +#ifdef CONFIG_64BIT
> +	/* Should we soft-disable interrupts? */
> +	andi.	r6, r5, BOOKE_INTERRUPT_EXTERNAL | BOOKE_INTERRUPT_DECREMENTER | BOOKE_INTERRUPT_DOORBELL
> +	beq	skip_soft_dis
> +	SOFT_DISABLE_INTS(r7,r8)
> +skip_soft_dis:
> +#endif
>   	bl	kvmppc_handle_exit
>
>   	/* Restore vcpu pointer and the nonvolatiles we used. */
>