This patch exports the SIE hardware control block to userspace
via the mapping of the vcpu file descriptor.
Signed-off-by: Carsten Otte <co...@de.ibm.com>
---
---
arch/s390/include/asm/kvm_host.h | 2 ++
virt/kvm/kvm_main.c | 5 +++++
2 files changed, 7 insertions(+)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -24,6 +24,8 @@
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 4
+#define KVM_SIE_PAGE_OFFSET 1
+
struct sca_entry {
atomic_t scn;
__u32 reserved;
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1656,6 +1656,11 @@ static int kvm_vcpu_fault(struct vm_area
else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
#endif
+#if defined(CONFIG_S390) && defined(CONFIG_KVM_UCONTROL)
+ else if ((vmf->pgoff == KVM_SIE_PAGE_OFFSET)
+ && (!(vcpu->kvm->arch.gmap)))
+ page = virt_to_page(vcpu->arch.sie_block);
+#endif
else
return VM_FAULT_SIGBUS;
get_page(page);
--
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