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-rw-r--r--arch/arm/kvm/hyp/Makefile1
-rw-r--r--arch/arm/kvm/hyp/entry.S70
-rw-r--r--arch/arm/kvm/hyp/hyp.h2
3 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile
index 173bd1dd77e7..c77969008665 100644
--- a/arch/arm/kvm/hyp/Makefile
+++ b/arch/arm/kvm/hyp/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_KVM_ARM_HOST) += timer-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += vfp.o
obj-$(CONFIG_KVM_ARM_HOST) += banked-sr.o
+obj-$(CONFIG_KVM_ARM_HOST) += entry.o
diff --git a/arch/arm/kvm/hyp/entry.S b/arch/arm/kvm/hyp/entry.S
new file mode 100644
index 000000000000..32f79b090040
--- /dev/null
+++ b/arch/arm/kvm/hyp/entry.S
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/kvm_arm.h>
+
+ .arch_extension virt
+
+ .text
+ .pushsection .hyp.text, "ax"
+
+#define USR_REGS_OFFSET (CPU_CTXT_GP_REGS + GP_REGS_USR)
+
+/* int __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host) */
+ENTRY(__guest_enter)
+ @ Save host registers
+ add r1, r1, #(USR_REGS_OFFSET + S_R4)
+ stm r1!, {r4-r12}
+ str lr, [r1, #4] @ Skip SP_usr (already saved)
+
+ @ Restore guest registers
+ add r0, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R0)
+ ldr lr, [r0, #S_LR]
+ ldm r0, {r0-r12}
+
+ clrex
+ eret
+ENDPROC(__guest_enter)
+
+ENTRY(__guest_exit)
+ /*
+ * return convention:
+ * guest r0, r1, r2 saved on the stack
+ * r0: vcpu pointer
+ * r1: exception code
+ */
+
+ add r2, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R3)
+ stm r2!, {r3-r12}
+ str lr, [r2, #4]
+ add r2, r0, #(VCPU_GUEST_CTXT + USR_REGS_OFFSET + S_R0)
+ pop {r3, r4, r5} @ r0, r1, r2
+ stm r2, {r3-r5}
+
+ ldr r0, [r0, #VCPU_HOST_CTXT]
+ add r0, r0, #(USR_REGS_OFFSET + S_R4)
+ ldm r0!, {r4-r12}
+ ldr lr, [r0, #4]
+
+ mov r0, r1
+ bx lr
+ENDPROC(__guest_exit)
+
+ .popsection
+
diff --git a/arch/arm/kvm/hyp/hyp.h b/arch/arm/kvm/hyp/hyp.h
index 278eb1fa5231..b3f6ed233564 100644
--- a/arch/arm/kvm/hyp/hyp.h
+++ b/arch/arm/kvm/hyp/hyp.h
@@ -110,4 +110,6 @@ static inline bool __vfp_enabled(void)
void __hyp_text __banked_save_state(struct kvm_cpu_context *ctxt);
void __hyp_text __banked_restore_state(struct kvm_cpu_context *ctxt);
+int asmlinkage __guest_enter(struct kvm_vcpu *vcpu,
+ struct kvm_cpu_context *host);
#endif /* __ARM_KVM_HYP_H__ */