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arm64: KVM: Invoke compute_layout() before alternatives are applied

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compute_layout() is invoked as part of an alternative fixup under
stop_machine(). This function invokes get_random_long() which acquires a
sleeping lock on -RT which can not be acquired in this context.

Rename compute_layout() to kvm_compute_layout() and invoke it before
stop_machine() applies the alternatives. Add a __init prefix to
kvm_compute_layout() because the caller has it, too (and so the code can be
discarded after boot).

Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sebastian Andrzej Siewior 2019-11-28 20:58:05 +01:00 committed by Catalin Marinas
parent df325e05a6
commit 0492747c72
3 changed files with 6 additions and 7 deletions
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1
arch/arm64/include/asm/kvm_mmu.h
View File

@ -91,6 +91,7 @@ alternative_cb_end
void kvm_update_va_mask(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr, int nr_inst);
void kvm_compute_layout(void);
static inline unsigned long __kern_hyp_va(unsigned long v)
{

4
arch/arm64/kernel/smp.c
View File

@ -31,6 +31,7 @@
#include <linux/of.h>
#include <linux/irq_work.h>
#include <linux/kexec.h>
#include <linux/kvm_host.h>
#include <asm/alternative.h>
#include <asm/atomic.h>
@ -39,6 +40,7 @@
#include <asm/cputype.h>
#include <asm/cpu_ops.h>
#include <asm/daifflags.h>
#include <asm/kvm_mmu.h>
#include <asm/mmu_context.h>
#include <asm/numa.h>
#include <asm/pgtable.h>
@ -408,6 +410,8 @@ static void __init hyp_mode_check(void)
"CPU: CPUs started in inconsistent modes");
else
pr_info("CPU: All CPU(s) started at EL1\n");
if (IS_ENABLED(CONFIG_KVM_ARM_HOST))
kvm_compute_layout();
}
void __init smp_cpus_done(unsigned int max_cpus)

8
arch/arm64/kvm/va_layout.c
View File

@ -22,7 +22,7 @@ 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;
@ -110,9 +110,6 @@ 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;
@ -156,9 +153,6 @@ 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()
*/