diff options
| author | Khalid Aziz <khalid.aziz@oracle.com> | 2018-02-21 18:15:46 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-18 15:38:46 +0100 |
| commit | 52df948d1bff7954f416085a821e299a188424b8 (patch) | |
| tree | 627a491f027738807c0fb7e8a585e9d9d895596b /arch/sparc/kernel/traps_64.c | |
| parent | sparc64: Add support for ADI register fields, ASIs and traps (diff) | |
| download | linux-52df948d1bff7954f416085a821e299a188424b8.tar.xz linux-52df948d1bff7954f416085a821e299a188424b8.zip | |
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.c | 29 |
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) |