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-rw-r--r--arch/arm/include/asm/kvm_mmu.h7
-rw-r--r--arch/arm64/include/asm/kvm_mmu.h20
-rw-r--r--virt/kvm/arm/hyp/vgic-v2-sr.c2
3 files changed, 28 insertions, 1 deletions
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 7f66b1b3aca1..6a0d496c4145 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -28,6 +28,13 @@
*/
#define kern_hyp_va(kva) (kva)
+/* Contrary to arm64, there is no need to generate a PC-relative address */
+#define hyp_symbol_addr(s) \
+ ({ \
+ typeof(s) *addr = &(s); \
+ addr; \
+ })
+
/*
* KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
*/
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 824c83db9b47..cd7c9a3e0a03 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -131,6 +131,26 @@ static inline unsigned long __kern_hyp_va(unsigned long v)
#define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v))))
/*
+ * Obtain the PC-relative address of a kernel symbol
+ * s: symbol
+ *
+ * The goal of this macro is to return a symbol's address based on a
+ * PC-relative computation, as opposed to a loading the VA from a
+ * constant pool or something similar. This works well for HYP, as an
+ * absolute VA is guaranteed to be wrong. Only use this if trying to
+ * obtain the address of a symbol (i.e. not something you obtained by
+ * following a pointer).
+ */
+#define hyp_symbol_addr(s) \
+ ({ \
+ typeof(s) *addr; \
+ asm("adrp %0, %1\n" \
+ "add %0, %0, :lo12:%1\n" \
+ : "=r" (addr) : "S" (&s)); \
+ addr; \
+ })
+
+/*
* We currently only support a 40bit IPA.
*/
#define KVM_PHYS_SHIFT (40)
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c
index 95021246ee26..3d6dbdf850aa 100644
--- a/virt/kvm/arm/hyp/vgic-v2-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v2-sr.c
@@ -203,7 +203,7 @@ int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
return -1;
rd = kvm_vcpu_dabt_get_rd(vcpu);
- addr = kern_hyp_va((kern_hyp_va(&kvm_vgic_global_state))->vcpu_base_va);
+ addr = kern_hyp_va(hyp_symbol_addr(kvm_vgic_global_state)->vcpu_base_va);
addr += fault_ipa - vgic->vgic_cpu_base;
if (kvm_vcpu_dabt_iswrite(vcpu)) {