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Subject[PATCH v2 10/10] kvm: arm64: Remove unnecessary hyp mappings
Date
With all nVHE per-CPU variables being part of the hyp per-CPU region,
mapping them individual is not necessary any longer. They are mapped to hyp
as part of the overall per-CPU region.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/kvm_mmu.h | 25 +++++++------------------
arch/arm64/kvm/arm.c | 17 +----------------
2 files changed, 8 insertions(+), 34 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 9db93da35606..bbe9df76ff42 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -531,28 +531,17 @@ static inline int kvm_map_vectors(void)
DECLARE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
DECLARE_KVM_NVHE_PER_CPU(u64, arm64_ssbd_callback_required);

-static inline int hyp_init_aux_data(void)
+static inline void hyp_init_aux_data(void)
{
- int cpu, err;
+ int cpu;

- for_each_possible_cpu(cpu) {
- u64 *ptr;
-
- ptr = per_cpu_ptr_nvhe(arm64_ssbd_callback_required, cpu);
- err = create_hyp_mappings(ptr, ptr + 1, PAGE_HYP);
- if (err)
- return err;
-
- /* Copy value from kernel to hyp. */
- *ptr = per_cpu(arm64_ssbd_callback_required, cpu);
- }
- return 0;
+ /* Copy arm64_ssbd_callback_required values from kernel to hyp. */
+ for_each_possible_cpu(cpu)
+ *(per_cpu_ptr_nvhe(arm64_ssbd_callback_required, cpu)) =
+ per_cpu(arm64_ssbd_callback_required, cpu);
}
#else
-static inline int hyp_init_aux_data(void)
-{
- return 0;
-}
+static inline void hyp_init_aux_data(void) {}
#endif

#define kvm_phys_to_vttbr(addr) phys_to_ttbr(addr)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index df7d133056ce..dfe1baa5bbb7 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1631,22 +1631,7 @@ static int init_hyp_mode(void)
}
}

- for_each_possible_cpu(cpu) {
- kvm_host_data_t *cpu_data;
-
- cpu_data = per_cpu_ptr_hyp(kvm_host_data, cpu);
- err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP);
-
- if (err) {
- kvm_err("Cannot map host CPU state: %d\n", err);
- goto out_err;
- }
- }
-
- err = hyp_init_aux_data();
- if (err)
- kvm_err("Cannot map host auxiliary data: %d\n", err);
-
+ hyp_init_aux_data();
return 0;

out_err:
--
2.28.0.402.g5ffc5be6b7-goog
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