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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2016-05-24 12:33:52 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-01-30 11:19:16 +0100
commitf41711788c9c281a61c8cf3222dca8a0e74a4fb3 (patch)
tree10ac09cec8ad2d7121a5698741500558ab8d92d8 /arch/s390
parent2f87d942be9d0f86e44fbcbd473264c26c7f1809 (diff)
downloadlinux-f41711788c9c281a61c8cf3222dca8a0e74a4fb3.tar.gz
linux-f41711788c9c281a61c8cf3222dca8a0e74a4fb3.tar.xz
KVM: s390: guestdbg: filter i-fetch events on icpts
We already filter PER events reported via icpt code 8. For icpt code 4 and 56, this is still missing. So let's properly detect if we have a debugging event and if we have to inject a PER i-fetch event into the guest at all. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/guestdbg.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index d7c6a7f53ced..a2077833ab01 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -388,14 +388,13 @@ void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu)
#define per_write_wp_event(code) \
(code & (PER_CODE_STORE | PER_CODE_STORE_REAL))
-static int debug_exit_required(struct kvm_vcpu *vcpu)
+static int debug_exit_required(struct kvm_vcpu *vcpu, u8 perc,
+ unsigned long peraddr)
{
- u8 perc = vcpu->arch.sie_block->perc;
struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch;
struct kvm_hw_wp_info_arch *wp_info = NULL;
struct kvm_hw_bp_info_arch *bp_info = NULL;
unsigned long addr = vcpu->arch.sie_block->gpsw.addr;
- unsigned long peraddr = vcpu->arch.sie_block->peraddr;
if (guestdbg_hw_bp_enabled(vcpu)) {
if (per_write_wp_event(perc) &&
@@ -442,6 +441,8 @@ exit_required:
int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu)
{
+ const u64 cr10 = vcpu->arch.sie_block->gcr[10];
+ const u64 cr11 = vcpu->arch.sie_block->gcr[11];
const u8 ilen = kvm_s390_get_ilen(vcpu);
struct kvm_s390_pgm_info pgm_info = {
.code = PGM_PER,
@@ -454,7 +455,19 @@ int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu)
* instruction generated a PER i-fetch event. PER address therefore
* points at the previous PSW address (could be an EXECUTE function).
*/
- return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
+ if (!guestdbg_enabled(vcpu))
+ return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
+
+ if (debug_exit_required(vcpu, pgm_info.per_code, pgm_info.per_address))
+ vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
+
+ if (!guest_per_enabled(vcpu) ||
+ !(vcpu->arch.sie_block->gcr[9] & PER_EVENT_IFETCH))
+ return 0;
+
+ if (in_addr_range(pgm_info.per_address, cr10, cr11))
+ return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
+ return 0;
}
static void filter_guest_per_event(struct kvm_vcpu *vcpu)
@@ -500,7 +513,8 @@ void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu)
{
int new_as;
- if (debug_exit_required(vcpu))
+ if (debug_exit_required(vcpu, vcpu->arch.sie_block->perc,
+ vcpu->arch.sie_block->peraddr))
vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
filter_guest_per_event(vcpu);