Commit 52df948d authored by Khalid Aziz's avatar Khalid Aziz Committed by David S. Miller
Browse files

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: default avatarKhalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: default avatarAnthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 75037500

arch/sparc/kernel/traps_64.c

+26 −3
Original line number Diff line number Diff line
@@ -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;

	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)

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