Kernel sets fault address and status in CRB for NX page fault on user
space address after processing page fault. User space gets the signal
and handles the fault mentioned in CRB by bringing the page in to
memory and send NX request again.
Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <ha...@linux.ibm.com>
---
arch/powerpc/include/asm/icswx.h | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h
index 9872f85..b233d1e 100644
--- a/arch/powerpc/include/asm/icswx.h
+++ b/arch/powerpc/include/asm/icswx.h
@@ -108,6 +108,17 @@ struct data_descriptor_entry {
__be64 address;
} __packed __aligned(DDE_ALIGN);
+/* 4.3.2 NX-stamped Fault CRB */
+
+#define NX_STAMP_ALIGN (0x10)
+
+struct nx_fault_stamp {
+ __be64 fault_storage_addr;
+ __be16 reserved;
+ __u8 flags;
+ __u8 fault_status;
+ __be32 pswid;
+} __packed __aligned(NX_STAMP_ALIGN);
/* Chapter 6.5.2 Coprocessor-Request Block (CRB) */
@@ -135,7 +146,12 @@ struct coprocessor_request_block {
struct coprocessor_completion_block ccb;
- u8 reserved[48];
+ union {
+ struct nx_fault_stamp nx;
+ u8 reserved[16];
+ } stamp;
+
+ u8 reserved[32];
struct coprocessor_status_block csb;
} __packed __aligned(CRB_ALIGN);
--
1.8.3.1
