sparc64: Add HV fault type handlers for ADI related faults

ADI (Application Data Integrity) feature on M7 and newer processors
adds new fault types for hypervisor - Invalid ASI and MCD disabled.
This patch expands data access exception handler to handle these
faults.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 3 deletions

diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index fc73baa588f6..d273a65a0a10 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -397,12 +397,35 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
         if (is_no_fault_exception(regs))
                 return;
 
-        info.si_signo = SIGSEGV;
+        /* MCD (Memory Corruption Detection) disabled trap (TT=0x19) in HV
+         * is vectored thorugh data access exception trap with fault type
+         * set to HV_FAULT_TYPE_MCD_DIS. Check for MCD disabled trap.
+         * Accessing an address with invalid ASI for the address, for
+         * example setting an ADI tag on an address with ASI_MCD_PRIMARY
+         * when TTE.mcd is not set for the VA, is also vectored into
+         * kerbel by HV as data access exception with fault type set to
+         * HV_FAULT_TYPE_INV_ASI.
+         */
         info.si_errno = 0;
-        info.si_code = SEGV_MAPERR;
         info.si_addr = (void __user *) addr;
         info.si_trapno = 0;
-        force_sig_info(SIGSEGV, &info, current);
+        switch (type) {
+        case HV_FAULT_TYPE_INV_ASI:
+                info.si_signo = SIGILL;
+                info.si_code = ILL_ILLADR;
+                force_sig_info(SIGILL, &info, current);
+                break;
+        case HV_FAULT_TYPE_MCD_DIS:
+                info.si_signo = SIGSEGV;
+                info.si_code = SEGV_ACCADI;
+                force_sig_info(SIGSEGV, &info, current);
+                break;
+        default:
+                info.si_signo = SIGSEGV;
+                info.si_code = SEGV_MAPERR;
+                force_sig_info(SIGSEGV, &info, current);
+                break;
+        }
 }
 
 void sun4v_data_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)