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authorCarsten Otte <cotte@de.ibm.com>2012-01-04 10:25:22 +0100
committerAvi Kivity <avi@redhat.com>2012-03-05 14:52:19 +0200
commite168bf8de33e16a909df2401af1f7d419c5780de (patch)
tree49dee8cc76e65eb1347895a6cb8f8843f690066d /Documentation/virtual
parent27e0393f15fc8bc855c6a888387ff5ffd2181089 (diff)
downloadlinux-e168bf8de33e16a909df2401af1f7d419c5780de.tar.bz2
KVM: s390: ucontrol: export page faults to user
This patch introduces a new exit reason in the kvm_run structure named KVM_EXIT_S390_UCONTROL. This exit indicates, that a virtual cpu has regognized a fault on the host page table. The idea is that userspace can handle this fault by mapping memory at the fault location into the cpu's address space and then continue to run the virtual cpu. Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index ee394b263261..6e53ff51422f 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1694,6 +1694,20 @@ s390 specific.
s390 specific.
+ /* KVM_EXIT_S390_UCONTROL */
+ struct {
+ __u64 trans_exc_code;
+ __u32 pgm_code;
+ } s390_ucontrol;
+
+s390 specific. A page fault has occurred for a user controlled virtual
+machine (KVM_VM_S390_UNCONTROL) on it's host page table that cannot be
+resolved by the kernel.
+The program code and the translation exception code that were placed
+in the cpu's lowcore are presented here as defined by the z Architecture
+Principles of Operation Book in the Chapter for Dynamic Address Translation
+(DAT)
+
/* KVM_EXIT_DCR */
struct {
__u32 dcrn;