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authorKhalid Aziz <khalid.aziz@oracle.com>2018-02-21 20:15:46 +0300
committerDavid S. Miller <davem@davemloft.net>2018-03-18 17:38:46 +0300
commit52df948d1bff7954f416085a821e299a188424b8 (patch)
tree627a491f027738807c0fb7e8a585e9d9d895596b /arch/sparc/kernel/traps_64.c
parent750375003deae240967eed6b13529a4bfc8ca11e (diff)
downloadlinux-52df948d1bff7954f416085a821e299a188424b8.tar.xz
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>
Diffstat (limited to 'arch/sparc/kernel/traps_64.c')
-rw-r--r--arch/sparc/kernel/traps_64.c29
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)