lkml.org 
[lkml]   [2017]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v10 04/10] sparc64: Add HV fault type handlers for ADI related faults
Date
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>
---
v7:
- new patch split off from patch 4/4 in v6

arch/sparc/kernel/traps_64.c | 29 ++++++++++++++++++++++++++---
1 file 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)
--
2.11.0
\
 
 \ /
  Last update: 2017-11-15 23:48    [W:0.330 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site