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s390/kvm: Mask extra bits from program interrupt code

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The program interrupt code has some extra bits that are sometimes set
by hardware for various reasons; those bits should be ignored when the
program interrupt number is needed for interrupt handling.

Fixes: 05066cafa9 ("s390/mm/fault: Handle guest-related program interrupts in KVM")
Reported-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20241031120316.25462-1-imbrenda@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
2024-10-31 13:03:16 +01:00
committed by Heiko Carstens
parent 64844729a6
commit 34fb045edd
2 changed files with 2 additions and 2 deletions
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2
arch/s390/kvm/kvm-s390.c
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@@ -4737,7 +4737,7 @@ static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu)
if (kvm_s390_cur_gmap_fault_is_write())
flags = FAULT_FLAG_WRITE;
switch (current->thread.gmap_int_code) {
switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) {
case 0:
vcpu->stat.exit_null++;
break;

2
arch/s390/kvm/vsie.c
View File

@@ -922,7 +922,7 @@ static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
int rc;
if (current->thread.gmap_int_code == PGM_PROTECTION)
if ((current->thread.gmap_int_code & PGM_INT_CODE_MASK) == PGM_PROTECTION)
/* we can directly forward all protection exceptions */
return inject_fault(vcpu, PGM_PROTECTION,
current->thread.gmap_teid.addr * PAGE_SIZE, 1);