KVM: arm64: Duplicate hyp/timer-sr.c for VHE/nVHE

timer-sr.c contains a HVC handler for setting CNTVOFF_EL2 and two helper
functions for controlling access to physical counter. The former is used by
both VHE/nVHE and is duplicated, the latter are used only by nVHE and moved
to nvhe/timer-sr.c.

Signed-off-by: David Brazdil <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: David Brazdil

arch/arm64/include/asm/kvm_hyp.h

@@ -63,8 +63,10 @@ void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
 void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
 
+#ifdef __KVM_NVHE_HYPERVISOR__
 void __timer_enable_traps(struct kvm_vcpu *vcpu);
 void __timer_disable_traps(struct kvm_vcpu *vcpu);
+#endif
 
 #ifdef __KVM_NVHE_HYPERVISOR__
 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);

arch/arm64/kernel/image-vars.h

@@ -76,11 +76,6 @@ KVM_NVHE_ALIAS(abort_guest_exit_start);
 KVM_NVHE_ALIAS(__fpsimd_restore_state);
 KVM_NVHE_ALIAS(__fpsimd_save_state);
 
-/* Symbols defined in timer-sr.c (not yet compiled with nVHE build rules). */
-KVM_NVHE_ALIAS(__kvm_timer_set_cntvoff);
-KVM_NVHE_ALIAS(__timer_disable_traps);
-KVM_NVHE_ALIAS(__timer_enable_traps);
-
 /* Symbols defined in vgic-v2-cpuif-proxy.c (not yet compiled with nVHE build rules). */
 KVM_NVHE_ALIAS(__vgic_v2_perform_cpuif_access);
 

arch/arm64/kvm/hyp/Makefile

@@ -13,7 +13,7 @@ subdir-ccflags-y := -I$(incdir)				\
 obj-$(CONFIG_KVM) += hyp.o vhe/ nvhe/
 obj-$(CONFIG_KVM_INDIRECT_VECTORS) += smccc_wa.o
 
-hyp-y := vgic-v3-sr.o timer-sr.o aarch32.o vgic-v2-cpuif-proxy.o entry.o \
+hyp-y := vgic-v3-sr.o aarch32.o vgic-v2-cpuif-proxy.o entry.o \
 	 fpsimd.o
 
 # KVM code is run at a different exception code with a different map, so

arch/arm64/kvm/hyp/nvhe/Makefile

@@ -6,7 +6,8 @@
 asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
-obj-y := sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o ../hyp-entry.o
+obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o \
+	 ../hyp-entry.o
 
 obj-y := $(patsubst %.o,%.hyp.o,$(obj-y))
 extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y))

arch/arm64/kvm/hyp/timer-sr.c renamed to arch/arm64/kvm/hyp/nvhe/timer-sr.c

@@ -10,7 +10,7 @@
 
 #include <asm/kvm_hyp.h>
 
-void __hyp_text __kvm_timer_set_cntvoff(u64 cntvoff)
+void __kvm_timer_set_cntvoff(u64 cntvoff)
 {
 	write_sysreg(cntvoff, cntvoff_el2);
 }

arch/arm64/kvm/hyp/vhe/Makefile

@@ -6,7 +6,7 @@
 asflags-y := -D__KVM_VHE_HYPERVISOR__
 ccflags-y := -D__KVM_VHE_HYPERVISOR__
 
-obj-y := sysreg-sr.o debug-sr.o switch.o tlb.o ../hyp-entry.o
+obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o ../hyp-entry.o
 
 # KVM code is run at a different exception code with a different map, so
 # compiler instrumentation that inserts callbacks or checks into the code may

arch/arm64/kvm/hyp/vhe/timer-sr.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <[email protected]>
+ */
+
+#include <asm/kvm_hyp.h>
+
+void __kvm_timer_set_cntvoff(u64 cntvoff)
+{
+	write_sysreg(cntvoff, cntvoff_el2);
+}