Re: [kvm-unit-tests PATCH v5 2/6] s390x: add function to set DAT mode for all interrupts

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Wed, 12 Jul 2023 13:41:45 +0200
Nico Boehr <nrb@linux.ibm.com> wrote:

[...]

> +/**
> + * irq_set_dat_mode - Set the DAT mode of all interrupt handlers, except for
> + * restart.
> + * This will update the DAT mode and address space mode of all interrupt new
> + * PSWs.
> + *
> + * Since enabling DAT needs initalized CRs and the restart new PSW is often used
> + * to initalize CRs, the restart new PSW is never touched to avoid the chicken
> + * and egg situation.
> + *
> + * @dat specifies whether to use DAT or not
> + * @as specifies the address space mode to use - one of AS_PRIM, AS_ACCR,

please mention here that  as  will not be set if  dat == false

> + * AS_SECN or AS_HOME.
> + */
> +void irq_set_dat_mode(bool dat, uint64_t as)
> +{
> +	struct psw* irq_psws[] = {
> +		OPAQUE_PTR(GEN_LC_EXT_NEW_PSW),
> +		OPAQUE_PTR(GEN_LC_SVC_NEW_PSW),
> +		OPAQUE_PTR(GEN_LC_PGM_NEW_PSW),
> +		OPAQUE_PTR(GEN_LC_MCCK_NEW_PSW),
> +		OPAQUE_PTR(GEN_LC_IO_NEW_PSW),
> +	};
> +	struct psw *psw;
> +
> +	assert(as == AS_PRIM || as == AS_ACCR || as == AS_SECN || as == AS_HOME);
> +
> +	for (size_t i = 0; i < ARRAY_SIZE(irq_psws); i++) {
> +		psw = irq_psws[i];
> +		psw->dat = dat;
> +		if (dat)
> +			psw->as = as;
> +	}
> +}
> +
>  static void fixup_pgm_int(struct stack_frame_int *stack)
>  {
>  	/* If we have an error on SIE we directly move to sie_exit */
> diff --git a/lib/s390x/mmu.c b/lib/s390x/mmu.c
> index b474d7021d3f..199bd3fbc9c8 100644
> --- a/lib/s390x/mmu.c
> +++ b/lib/s390x/mmu.c
> @@ -12,6 +12,7 @@
>  #include <asm/pgtable.h>
>  #include <asm/arch_def.h>
>  #include <asm/barrier.h>
> +#include <asm/interrupt.h>
>  #include <vmalloc.h>
>  #include "mmu.h"
>  
> @@ -41,8 +42,8 @@ static void mmu_enable(pgd_t *pgtable)
>  	/* enable dat (primary == 0 set as default) */
>  	enable_dat();
>  
> -	/* we can now also use DAT unconditionally in our PGM handler */
> -	lowcore.pgm_new_psw.mask |= PSW_MASK_DAT;
> +	/* we can now also use DAT in all interrupt handlers */
> +	irq_set_dat_mode(IRQ_DAT_ON, AS_PRIM);
>  }
>  
>  /*