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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 26 Jul 2018 09:13:42 +0200
Subject: [PATCH 020/351] arm64: KVM: compute_layout before altenates are
applied
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=3e7a19db684d20c99425ab89480c71931f76aed3
compute_layout() is invoked as part of an alternative fixup under
stop_machine() and needs a sleeping lock as part of get_random_long().
Invoke compute_layout() before the alternatives are applied.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm64/include/asm/alternative.h | 6 ++++++
arch/arm64/kernel/alternative.c | 1 +
arch/arm64/kvm/va_layout.c | 7 +------
3 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
index 4fbbcdda70d7..99b215602a1a 100644
--- a/arch/arm64/include/asm/alternative.h
+++ b/arch/arm64/include/asm/alternative.h
@@ -35,6 +35,12 @@ void apply_alternatives_module(void *start, size_t length);
static inline void apply_alternatives_module(void *start, size_t length) { }
#endif
+#ifdef CONFIG_KVM_ARM_HOST
+void kvm_compute_layout(void);
+#else
+static inline void kvm_compute_layout(void) { }
+#endif
+
#define ALTINSTR_ENTRY(feature) \
" .word 661b - .\n" /* label */ \
" .word 663f - .\n" /* new instruction */ \
diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c
index 3747c8d87bdb..75ccb5b279a2 100644
--- a/arch/arm64/kernel/alternative.c
+++ b/arch/arm64/kernel/alternative.c
@@ -212,6 +212,7 @@ static int __apply_alternatives_multi_stop(void *unused)
void __init apply_alternatives_all(void)
{
/* better not try code patching on a live SMP system */
+ kvm_compute_layout();
stop_machine(__apply_alternatives_multi_stop, NULL, cpu_online_mask);
}
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index c712a7376bc1..792da0e125de 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -33,7 +33,7 @@ static u8 tag_lsb;
static u64 tag_val;
static u64 va_mask;
-static void compute_layout(void)
+__init void kvm_compute_layout(void)
{
phys_addr_t idmap_addr = __pa_symbol(__hyp_idmap_text_start);
u64 hyp_va_msb;
@@ -121,8 +121,6 @@ void __init kvm_update_va_mask(struct alt_instr *alt,
BUG_ON(nr_inst != 5);
- if (!has_vhe() && !va_mask)
- compute_layout();
for (i = 0; i < nr_inst; i++) {
u32 rd, rn, insn, oinsn;
@@ -167,9 +165,6 @@ void kvm_patch_vector_branch(struct alt_instr *alt,
return;
}
- if (!va_mask)
- compute_layout();
-
/*
* Compute HYP VA by using the same computation as kern_hyp_va()
*/
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