powerpc: Wire up the HV facility unavailable exception

Similar to the facility unavailble exception, except the facilities are
controlled by HFSCR.

Adapt the facility_unavailable_exception() so it can be called for
either the regular or Hypervisor facility unavailable exceptions.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
CC: <stable@vger.kernel.org> [v3.10]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 6ee74f8..359d949 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -347,6 +347,12 @@ facility_unavailable_trampoline:
        EXCEPTION_PROLOG_0(PACA_EXGEN)
        b       facility_unavailable_pSeries
 
+hv_facility_unavailable_trampoline:
+       . = 0xf80
+       SET_SCRATCH0(r13)
+       EXCEPTION_PROLOG_0(PACA_EXGEN)
+       b       facility_unavailable_hv
+
 #ifdef CONFIG_CBE_RAS
        STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
        KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
@@ -525,6 +531,8 @@ denorm_done:
        KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
        STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
        KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
+       STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
+       KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
 
 /*
  * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
@@ -836,6 +844,12 @@ facility_unavailable_relon_trampoline:
        EXCEPTION_PROLOG_0(PACA_EXGEN)
        b       facility_unavailable_relon_pSeries
 
+hv_facility_unavailable_relon_trampoline:
+       . = 0x4f80
+       SET_SCRATCH0(r13)
+       EXCEPTION_PROLOG_0(PACA_EXGEN)
+       b       facility_unavailable_relon_hv
+
        STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
 #ifdef CONFIG_PPC_DENORMALISATION
        . = 0x5500
@@ -1174,6 +1188,7 @@ __end_handlers:
        STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
        STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
        STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
+       STD_RELON_EXCEPTION_HV_OOL(0xf80, facility_unavailable)
 
 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
 /*

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 11f4488..4a87fcb 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1299,10 +1299,18 @@ void facility_unavailable_exception(struct pt_regs *regs)
                "EBB",
                "TAR",
        };
-       char *facility;
+       char *facility, *prefix;
        u64 value;
 
-       value = mfspr(SPRN_FSCR) >> 56;
+       if (regs->trap == 0xf60) {
+               value = mfspr(SPRN_FSCR);
+               prefix = "";
+       } else {
+               value = mfspr(SPRN_HFSCR);
+               prefix = "Hypervisor ";
+       }
+
+       value = value >> 56;
 
        /* We restore the interrupt state now */
        if (!arch_irq_disabled_regs(regs))
@@ -1313,8 +1321,8 @@ void facility_unavailable_exception(struct pt_regs *regs)
        else
                facility = "unknown";
 
-       pr_err("Facility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",
-               facility, regs->nip, regs->msr);
+       pr_err("%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",
+               prefix, facility, regs->nip, regs->msr);
 
        if (user_mode(regs)) {
                _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);