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sparc64: Fix DAX handling via userspace access from kernel.
If we do a userspace access from kernel mode, and get a data access exception, we need to check the exception table just like a normal fault does. The spitfire DAX handler was doing this, but such logic was missing from the sun4v DAX code. Reported-by: Dennis Gilmore <dgilmore@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 16 additions and 1 deletions
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@ -1,6 +1,6 @@
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/* arch/sparc64/kernel/traps.c
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*
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* Copyright (C) 1995,1997,2008 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1995,1997,2008,2009 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com)
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*/
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@ -314,6 +314,21 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
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return;
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if (regs->tstate & TSTATE_PRIV) {
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/* Test if this comes from uaccess places. */
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const struct exception_table_entry *entry;
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entry = search_exception_tables(regs->tpc);
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if (entry) {
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/* Ouch, somebody is trying VM hole tricks on us... */
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#ifdef DEBUG_EXCEPTIONS
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printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc);
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printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
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regs->tpc, entry->fixup);
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#endif
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regs->tpc = entry->fixup;
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regs->tnpc = regs->tpc + 4;
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return;
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}
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printk("sun4v_data_access_exception: ADDR[%016lx] "
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"CTX[%04x] TYPE[%04x], going.\n",
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addr, ctx, type);
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