[PATCH 1/5] powerpc: define ePAPR hcall exit interface

Bharat Bhushan
2013-07-15T11:18:25Z

This patch defines the ePAPR hcall exit interface to guest user space.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
---
Documentation/virtual/kvm/api.txt | 20 ++++++++++++++++++++
include/uapi/linux/kvm.h | 7 +++++++
2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 66dd2aa..054f2f4 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2597,6 +2597,26 @@ The possible hypercalls are defined in the Power Architecture Platform
Requirements (PAPR) document available from www.power.org (free
developer registration required to access it).

+ /* KVM_EXIT_EPAPR_HCALL */
+ struct {
+ __u64 nr;
+ __u64 ret;
+ __u64 args[8];
+ } epapr_hcall;
+
+This is used on PowerPC platforms that support ePAPR hcalls.
+It occurs when a guest does a hypercall (as defined
+in the ePAPR 1.1) and the hcall is not handled by the kernel.
+
+The 'nr' field contains the hypercall number (from the guest R11),
+and 'args' contains the arguments (from the guest R3 - R10).
+Userspace should put the return code in 'ret' and any extra returned
+values in args[]. If the VM is not in 64-bit mode KVM zeros
+the upper half of each field in the struct.
+
+As per the ePAPR hcall ABI, the return value is returned to
+the guest in R3 and output return values in R4 - R10.
+
/* KVM_EXIT_S390_TSCH */
struct {
__u16 subchannel_id;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index acccd08..01ee50e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -171,6 +171,7 @@ struct kvm_pit_config {
#define KVM_EXIT_WATCHDOG 21
#define KVM_EXIT_S390_TSCH 22
#define KVM_EXIT_EPR 23
+#define KVM_EXIT_EPAPR_HCALL 24

/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@@ -288,6 +289,12 @@ struct kvm_run {
__u64 ret;
__u64 args[9];
} papr_hcall;
+ /* KVM_EXIT_EPAPR_HCALL */
+ struct {
+ __u64 nr;
+ __u64 ret;
+ __u64 args[8];
+ } epapr_hcall;
/* KVM_EXIT_S390_TSCH */
struct {
__u16 subchannel_id;
--
1.7.0.4