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Commit d03193de authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
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KVM: s390: gaccess: function for preparing translation exceptions 



Let's provide a function trans_exc() that can be used for handling
preparation of translation exceptions on a central basis. We will use
that function to replace existing code in gaccess.

Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 6167375b

arch/s390/kvm/gaccess.c

+62 −0
Original line number Diff line number Diff line
@@ -476,6 +476,68 @@ enum { 
	FSI_FETCH   = 2  /* Exception was due to fetch operation */

};



enum prot_type {

	PROT_TYPE_LA   = 0,

	PROT_TYPE_KEYC = 1,

	PROT_TYPE_ALC  = 2,

	PROT_TYPE_DAT  = 3,

};



static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,

		     ar_t ar, enum gacc_mode mode, enum prot_type prot)

{

	struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;

	struct trans_exc_code_bits *tec;



	memset(pgm, 0, sizeof(*pgm));

	pgm->code = code;

	tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code;



	switch (code) {

	case PGM_ASCE_TYPE:

	case PGM_PAGE_TRANSLATION:

	case PGM_REGION_FIRST_TRANS:

	case PGM_REGION_SECOND_TRANS:

	case PGM_REGION_THIRD_TRANS:

	case PGM_SEGMENT_TRANSLATION:

		/*

		 * op_access_id only applies to MOVE_PAGE -> set bit 61

		 * exc_access_id has to be set to 0 for some instructions. Both

		 * cases have to be handled by the caller. We can always store

		 * exc_access_id, as it is undefined for non-ar cases.

		 */

		tec->addr = gva >> PAGE_SHIFT;

		tec->fsi = mode == GACC_STORE ? FSI_STORE : FSI_FETCH;

		tec->as = psw_bits(vcpu->arch.sie_block->gpsw).as;

		/* FALL THROUGH */

	case PGM_ALEN_TRANSLATION:

	case PGM_ALE_SEQUENCE:

	case PGM_ASTE_VALIDITY:

	case PGM_ASTE_SEQUENCE:

	case PGM_EXTENDED_AUTHORITY:

		pgm->exc_access_id = ar;

		break;

	case PGM_PROTECTION:

		switch (prot) {

		case PROT_TYPE_ALC:

			tec->b60 = 1;

			/* FALL THROUGH */

		case PROT_TYPE_DAT:

			tec->b61 = 1;

			tec->addr = gva >> PAGE_SHIFT;

			tec->fsi = mode == GACC_STORE ? FSI_STORE : FSI_FETCH;

			tec->as = psw_bits(vcpu->arch.sie_block->gpsw).as;

			/* exc_access_id is undefined for most cases */

			pgm->exc_access_id = ar;

			break;

		default: /* LA and KEYC set b61 to 0, other params undefined */

			break;

		}

		break;

	}

	return code;

}



static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,

			 unsigned long ga, ar_t ar, enum gacc_mode mode)

{