[PATCH v8 01/26] arm64: Fix HCR.TGE status for NMI contexts
From: Julien Thierry <hidden>
Date: 2019-01-08 14:08:04
Also in:
linux-arch, lkml, stable
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
When using VHE, the host needs to clear HCR_EL2.TGE bit in order to interract 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 <redacted> Suggested-by: Marc Zyngier <redacted> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <redacted> Cc: Marc Zyngier <redacted> Cc: James Morse <james.morse@arm.com> Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org --- arch/arm64/include/asm/hardirq.h | 28 ++++++++++++++++++++++++++++ arch/arm64/kernel/irq.c | 3 +++ include/linux/hardirq.h | 7 +++++++ 3 files changed, 38 insertions(+)
diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
index 1473fc2..94b7481 100644
--- a/arch/arm64/include/asm/hardirq.h
+++ b/arch/arm64/include/asm/hardirq.h@@ -19,6 +19,7 @@ #include <linux/cache.h> #include <linux/threads.h> #include <asm/irq.h> +#include <asm/kvm_arm.h> #define NR_IPI 7
@@ -37,6 +38,33 @@ #define __ARCH_IRQ_EXIT_IRQS_DISABLED 1 +struct nmi_ctx { + u64 hcr; +}; + +DECLARE_PER_CPU(struct nmi_ctx, nmi_contexts); + +#define arch_nmi_enter() \ + do { \ + if (is_kernel_in_hyp_mode()) { \ + struct nmi_ctx *nmi_ctx = this_cpu_ptr(&nmi_contexts); \ + nmi_ctx->hcr = read_sysreg(hcr_el2); \ + if (!(nmi_ctx->hcr & HCR_TGE)) { \ + write_sysreg(nmi_ctx->hcr | HCR_TGE, hcr_el2); \ + isb(); \ + } \ + } \ + } while (0) + +#define arch_nmi_exit() \ + do { \ + if (is_kernel_in_hyp_mode()) { \ + struct nmi_ctx *nmi_ctx = this_cpu_ptr(&nmi_contexts); \ + if (!(nmi_ctx->hcr & HCR_TGE)) \ + write_sysreg(nmi_ctx->hcr, hcr_el2); \ + } \ + } while (0) + static inline void ack_bad_irq(unsigned int irq) { extern unsigned long irq_err_count;
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 780a12f..92fa817 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c@@ -33,6 +33,9 @@ unsigned long irq_err_count; +/* Only access this in an NMI enter/exit */ +DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts); + DEFINE_PER_CPU(unsigned long *, irq_stack_ptr); int arch_show_interrupts(struct seq_file *p, int prec)
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index 0fbbcdf..da0af63 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h@@ -60,8 +60,14 @@ static inline void rcu_nmi_exit(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 @@ static inline void rcu_nmi_exit(void) ftrace_nmi_exit(); \ lockdep_on(); \ printk_nmi_exit(); \ + arch_nmi_exit(); \ } while (0) #endif /* LINUX_HARDIRQ_H */
--
1.9.1
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