linux-kernel - [PATCH v7 4/9] sparc64: Add HV fault type handlers for ADI related faults

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Message-Id: <870629f367fbd5d487a54b3796f66348218b5d7d.1502219353.git.khalid.aziz@oracle.com>
Date:   Wed,  9 Aug 2017 15:25:57 -0600
From:   Khalid Aziz <khalid.aziz@...cle.com>
To:     davem@...emloft.net, dave.hansen@...ux.intel.com
Cc:     Khalid Aziz <khalid.aziz@...cle.com>, akpm@...ux-foundation.org,
        vegard.nossum@...cle.com, mingo@...nel.org, peterz@...radead.org,
        dan.carpenter@...cle.com, Liam.Howlett@...cle.com,
        paul.gortmaker@...driver.com, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, Khalid Aziz <khalid@...ehiking.org>
Subject: [PATCH v7 4/9] 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@...cle.com>
Cc: Khalid Aziz <khalid@...ehiking.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 88eed0dc3faf..88c96d349f2f 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -352,12 +352,35 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
 		regs->tpc &= 0xffffffff;
 		regs->tnpc &= 0xffffffff;
 	}
-	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