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>

diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index d7c6a7f..a207783 100644 (file)
--- 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);