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arm64: Fix HCR.TGE status for NMI contexts

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When using VHE, the host needs to clear HCR_EL2.TGE bit in order
to interact with guest TLBs, switching from EL2&0 translation regime
to EL1&0.

However, some non-maskable asynchronous event could happen while TGE is
cleared like SDEI. Because of this address translation operations
relying on EL2&0 translation regime could fail (tlb invalidation,
userspace access, ...).

Fix this by properly setting HCR_EL2.TGE when entering NMI context and
clear it if necessary when returning to the interrupted context.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Julien Thierry
2019-01-31 14:58:39 +00:00
committed by Catalin Marinas
parent e26a433147
commit 5870970b9a
3 changed files with 41 additions and 0 deletions
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7
include/linux/hardirq.h
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@@ -60,8 +60,14 @@ extern void irq_enter(void);
*/
extern void irq_exit(void);
#ifndef arch_nmi_enter
#define arch_nmi_enter() do { } while (0)
#define arch_nmi_exit() do { } while (0)
#endif
#define nmi_enter() \
do { \
arch_nmi_enter(); \
printk_nmi_enter(); \
lockdep_off(); \
ftrace_nmi_enter(); \
@@ -80,6 +86,7 @@ extern void irq_exit(void);
ftrace_nmi_exit(); \
lockdep_on(); \
printk_nmi_exit(); \
arch_nmi_exit(); \
} while (0)
#endif /* LINUX_HARDIRQ_H */