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KVM: s390: gaccess: convert guest_page_range() 

Let's use our new function for preparing translation exceptions. As we will
need the correct ar, let's pass that to guest_page_range().

This will also make sure that the guest address is stored in the tec
for applicable excptions.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-05-31 20:13:35 +02:00 committed by Christian Borntraeger
parent fbcb7d5157
commit cde0dcfb5d
1 changed files with 9 additions and 18 deletions
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27
arch/s390/kvm/gaccess.c
View File

@ -792,40 +792,31 @@ static int low_address_protection_enabled(struct kvm_vcpu *vcpu,
return 1;
}
static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga,
static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar,
unsigned long *pages, unsigned long nr_pages,
const union asce asce, enum gacc_mode mode)
{
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
psw_t *psw = &vcpu->arch.sie_block->gpsw;
struct trans_exc_code_bits *tec_bits;
int lap_enabled, rc;
int lap_enabled, rc = 0;
tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
lap_enabled = low_address_protection_enabled(vcpu, asce);
while (nr_pages) {
ga = kvm_s390_logical_to_effective(vcpu, ga);
tec_bits->addr = ga >> PAGE_SHIFT;
if (mode == GACC_STORE && lap_enabled && is_low_address(ga)) {
pgm->code = PGM_PROTECTION;
return pgm->code;
}
if (mode == GACC_STORE && lap_enabled && is_low_address(ga))
return trans_exc(vcpu, PGM_PROTECTION, ga, ar, mode,
PROT_TYPE_LA);
ga &= PAGE_MASK;
if (psw_bits(*psw).t) {
rc = guest_translate(vcpu, ga, pages, asce, mode);
if (rc < 0)
return rc;
if (rc == PGM_PROTECTION)
tec_bits->b61 = 1;
if (rc)
pgm->code = rc;
} else {
*pages = kvm_s390_real_to_abs(vcpu, ga);
if (kvm_is_error_gpa(vcpu->kvm, *pages))
pgm->code = PGM_ADDRESSING;
rc = PGM_ADDRESSING;
}
if (pgm->code)
return pgm->code;
if (rc)
return trans_exc(vcpu, rc, ga, ar, mode, PROT_TYPE_DAT);
ga += PAGE_SIZE;
pages++;
nr_pages--;
@ -859,7 +850,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
need_ipte_lock = psw_bits(*psw).t && !asce.r;
if (need_ipte_lock)
ipte_lock(vcpu);
rc = guest_page_range(vcpu, ga, pages, nr_pages, asce, mode);
rc = guest_page_range(vcpu, ga, ar, pages, nr_pages, asce, mode);
for (idx = 0; idx < nr_pages && !rc; idx++) {
gpa = *(pages + idx) + (ga & ~PAGE_MASK);
_len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);