[PATCH v3 22/37] KVM: s390: protvirt: Write sthyi data to instruction data area

Christian Borntraeger
2020-02-20T10:40:31Z

From: Janosch Frank <frankja@linux.ibm.com>

STHYI data has to go through the bounce buffer.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
arch/s390/kvm/intercept.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 850045034016..a5de0e1975bb 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -392,7 +392,7 @@ int handle_sthyi(struct kvm_vcpu *vcpu)
goto out;
}

- if (addr & ~PAGE_MASK)
+ if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK))
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

sctns = (void *)get_zeroed_page(GFP_KERNEL);
@@ -403,10 +403,15 @@ int handle_sthyi(struct kvm_vcpu *vcpu)

out:
if (!cc) {
- r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
- if (r) {
- free_page((unsigned long)sctns);
- return kvm_s390_inject_prog_cond(vcpu, r);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ memcpy((void *)(sida_origin(vcpu->arch.sie_block)),
+ sctns, PAGE_SIZE);
+ } else {
+ r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
+ if (r) {
+ free_page((unsigned long)sctns);
+ return kvm_s390_inject_prog_cond(vcpu, r);
+ }
}
}

--
2.25.0