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powerpc/64s: Fix HV NMI vs HV interrupt recoverability test

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HV interrupts that use HSRR registers do not enter with MSR[RI] clear,
but their entry code is not recoverable vs NMI, due to shared use of
HSPRG1 as a scratch register to save r13.

This means that a system reset or machine check that hits in HSRR
interrupt entry can cause r13 to be silently corrupted.

Fix this by marking NMIs non-recoverable if they land in HV interrupt
ranges.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2019-02-26 18:51:07 +10:00 • committed by Michael Ellerman
parent 3b4d07d267
commit ccd477028a
5 changed files with 87 additions and 0 deletions
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3
arch/powerpc/kernel/mce.c
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@ -31,6 +31,7 @@
#include <asm/machdep.h>
#include <asm/mce.h>
#include <asm/nmi.h>
static DEFINE_PER_CPU(int, mce_nest_count);
static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event);
@ -490,6 +491,8 @@ long machine_check_early(struct pt_regs *regs)
{
long handled = 0;
hv_nmi_check_nonrecoverable(regs);
/*
* See if platform is capable of handling machine check.
*/