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Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 75beea632a10..aacb6b129914 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -636,8 +636,49 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
return 0;
}
+static int handle_essa(struct kvm_vcpu *vcpu)
+{
+ /* entries expected to be 1FF */
+ int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
+ unsigned long *cbrlo, cbrle;
+ struct gmap *gmap;
+ int i;
+
+ VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
+ gmap = vcpu->arch.gmap;
+ vcpu->stat.instruction_essa++;
+ if (!kvm_enabled_cmma() || !vcpu->arch.sie_block->cbrlo)
+ return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
+
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
+ if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+
+ /* Rewind PSW to repeat the ESSA instruction */
+ vcpu->arch.sie_block->gpsw.addr =
+ __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
+ vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
+ cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
+ down_read(&gmap->mm->mmap_sem);
+ for (i = 0; i < entries; ++i) {
+ cbrle = cbrlo[i];
+ if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
+ /* invalid entry */
+ break;
+ /* try to free backing */
+ __gmap_zap(cbrle, gmap);
+ }
+ up_read(&gmap->mm->mmap_sem);
+ if (i < entries)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ return 0;
+}
+
static const intercept_handler_t b9_handlers[256] = {
[0x8d] = handle_epsw,
+ [0xab] = handle_essa,
[0xaf] = handle_pfmf,
};