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Subject[PATCH v2 05/10] kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars
Date
Defining a per-CPU variable in hyp/nvhe will result in its name being
prefixed with __kvm_nvhe_. Add helpers for declaring these variables
in kernel proper and accessing them with this_cpu_ptr and per_cpu_ptr.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/kvm_asm.h | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 469c0662f7f3..2b89817cdb01 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -60,9 +60,21 @@
DECLARE_KVM_VHE_SYM(sym); \
DECLARE_KVM_NVHE_SYM(sym)

+#define DECLARE_KVM_VHE_PER_CPU(type, sym) \
+ DECLARE_PER_CPU(type, sym)
+#define DECLARE_KVM_NVHE_PER_CPU(type, sym) \
+ DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
+
+#define DECLARE_KVM_HYP_PER_CPU(type, sym) \
+ DECLARE_KVM_VHE_PER_CPU(type, sym); \
+ DECLARE_KVM_NVHE_PER_CPU(type, sym)
+
#define CHOOSE_VHE_SYM(sym) sym
#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)

+#define this_cpu_ptr_nvhe(sym) this_cpu_ptr(&kvm_nvhe_sym(sym))
+#define per_cpu_ptr_nvhe(sym, cpu) per_cpu_ptr(&kvm_nvhe_sym(sym), cpu)
+
#ifndef __KVM_NVHE_HYPERVISOR__
/*
* BIG FAT WARNINGS:
@@ -75,12 +87,21 @@
* - Don't let the nVHE hypervisor have access to this, as it will
* pick the *wrong* symbol (yes, it runs at EL2...).
*/
-#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() ? CHOOSE_VHE_SYM(sym) \
+#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \
+ ? CHOOSE_VHE_SYM(sym) \
: CHOOSE_NVHE_SYM(sym))
+#define this_cpu_ptr_hyp(sym) (is_kernel_in_hyp_mode() \
+ ? this_cpu_ptr(&sym) \
+ : this_cpu_ptr_nvhe(sym))
+#define per_cpu_ptr_hyp(sym, cpu) (is_kernel_in_hyp_mode() \
+ ? per_cpu_ptr(&sym, cpu) \
+ : per_cpu_ptr_nvhe(sym, cpu))
#else
/* The nVHE hypervisor shouldn't even try to access anything */
extern void *__nvhe_undefined_symbol;
-#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol
+#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol
+#define this_cpu_ptr_hyp(sym) (&__nvhe_undefined_symbol)
+#define per_cpu_ptr_hyp(sym, cpu) (&__nvhe_undefined_symbol)
#endif

/* Translate a kernel address @ptr into its equivalent linear mapping */
--
2.28.0.402.g5ffc5be6b7-goog
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