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authorJames Morse <james.morse@arm.com>2019-01-29 21:48:50 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-02-08 01:10:45 +0300
commitd44f1b8dd7e66d80cc4205809e5ace866bd851da (patch)
tree102c993327b0f620c9d1aefcc95ad3d7819fd68c /arch/arm64/include/asm/daifflags.h
parent0db5e0223035b2c84e6186831fc27511270af812 (diff)
downloadlinux-d44f1b8dd7e66d80cc4205809e5ace866bd851da.tar.xz
arm64: KVM/mm: Move SEA handling behind a single 'claim' interface
To split up APEIs in_nmi() path, the caller needs to always be in_nmi(). Add a helper to do the work and claim the notification. When KVM or the arch code takes an exception that might be a RAS notification, it asks the APEI firmware-first code whether it wants to claim the exception. A future kernel-first mechanism may be queried afterwards, and claim the notification, otherwise we fall through to the existing default behaviour. The NOTIFY_SEA code was merged before considering multiple, possibly interacting, NMI-like notifications and the need to consider kernel first in the future. Make the 'claiming' behaviour explicit. Restructuring the APEI code to allow multiple NMI-like notifications means any notification that might interrupt interrupts-masked code must always be wrapped in nmi_enter()/nmi_exit(). This will allow APEI to use in_nmi() to use the right fixmap entries. Mask SError over this window to prevent an asynchronous RAS error arriving and tripping 'nmi_enter()'s BUG_ON(in_nmi()). Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Tyler Baicar <tbaicar@codeaurora.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/arm64/include/asm/daifflags.h')
-rw-r--r--arch/arm64/include/asm/daifflags.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h
index 8d91f2233135..fa90779fc752 100644
--- a/arch/arm64/include/asm/daifflags.h
+++ b/arch/arm64/include/asm/daifflags.h
@@ -20,6 +20,7 @@
#define DAIF_PROCCTX 0
#define DAIF_PROCCTX_NOIRQ PSR_I_BIT
+#define DAIF_ERRCTX (PSR_I_BIT | PSR_A_BIT)
/* mask/save/unmask/restore all exceptions, including interrupts. */
static inline void local_daif_mask(void)