1 files changed, 51 insertions, 7 deletions

diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index ed27f06a31ba..a820dfdc9c25 100644
--- a/arch/arm64/kvm/hyp/nvhe/host.S
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -13,8 +13,6 @@
 	.text
 
 SYM_FUNC_START(__host_exit)
-	stp	x0, x1, [sp, #-16]!
-
 	get_host_ctxt	x0, x1
 
 	/* Store the host regs x2 and x3 */
@@ -41,6 +39,7 @@ SYM_FUNC_START(__host_exit)
 	bl	handle_trap
 
 	/* Restore host regs x0-x17 */
+__host_enter_restore_full:
 	ldp	x0, x1,   [x29, #CPU_XREG_OFFSET(0)]
 	ldp	x2, x3,   [x29, #CPU_XREG_OFFSET(2)]
 	ldp	x4, x5,   [x29, #CPU_XREG_OFFSET(4)]
@@ -64,6 +63,14 @@ __host_enter_without_restoring:
 SYM_FUNC_END(__host_exit)
 
 /*
+ * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
+ */
+SYM_FUNC_START(__host_enter)
+	mov	x29, x0
+	b	__host_enter_restore_full
+SYM_FUNC_END(__host_enter)
+
+/*
  * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
  */
 SYM_FUNC_START(__hyp_do_panic)
@@ -99,13 +106,15 @@ SYM_FUNC_END(__hyp_do_panic)
 	mrs	x0, esr_el2
 	lsr	x0, x0, #ESR_ELx_EC_SHIFT
 	cmp	x0, #ESR_ELx_EC_HVC64
-	ldp	x0, x1, [sp], #16
 	b.ne	__host_exit
 
+	ldp	x0, x1, [sp]		// Don't fixup the stack yet
+
 	/* Check for a stub HVC call */
 	cmp	x0, #HVC_STUB_HCALL_NR
 	b.hs	__host_exit
 
+	add	sp, sp, #16
 	/*
 	 * Compute the idmap address of __kvm_handle_stub_hvc and
 	 * jump there. Since we use kimage_voffset, do not use the
@@ -115,10 +124,7 @@ SYM_FUNC_END(__hyp_do_panic)
 	 * Preserve x0-x4, which may contain stub parameters.
 	 */
 	ldr	x5, =__kvm_handle_stub_hvc
-	ldr_l	x6, kimage_voffset
-
-	/* x5 = __pa(x5) */
-	sub	x5, x5, x6
+	kimg_pa x5, x6
 	br	x5
 .L__vect_end\@:
 .if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
@@ -183,3 +189,41 @@ SYM_CODE_START(__kvm_hyp_host_vector)
 	invalid_host_el1_vect			// FIQ 32-bit EL1
 	invalid_host_el1_vect			// Error 32-bit EL1
 SYM_CODE_END(__kvm_hyp_host_vector)
+
+/*
+ * Forward SMC with arguments in struct kvm_cpu_context, and
+ * store the result into the same struct. Assumes SMCCC 1.2 or older.
+ *
+ * x0: struct kvm_cpu_context*
+ */
+SYM_CODE_START(__kvm_hyp_host_forward_smc)
+	/*
+	 * Use x18 to keep the pointer to the host context because
+	 * x18 is callee-saved in SMCCC but not in AAPCS64.
+	 */
+	mov	x18, x0
+
+	ldp	x0, x1,   [x18, #CPU_XREG_OFFSET(0)]
+	ldp	x2, x3,   [x18, #CPU_XREG_OFFSET(2)]
+	ldp	x4, x5,   [x18, #CPU_XREG_OFFSET(4)]
+	ldp	x6, x7,   [x18, #CPU_XREG_OFFSET(6)]
+	ldp	x8, x9,   [x18, #CPU_XREG_OFFSET(8)]
+	ldp	x10, x11, [x18, #CPU_XREG_OFFSET(10)]
+	ldp	x12, x13, [x18, #CPU_XREG_OFFSET(12)]
+	ldp	x14, x15, [x18, #CPU_XREG_OFFSET(14)]
+	ldp	x16, x17, [x18, #CPU_XREG_OFFSET(16)]
+
+	smc	#0
+
+	stp	x0, x1,   [x18, #CPU_XREG_OFFSET(0)]
+	stp	x2, x3,   [x18, #CPU_XREG_OFFSET(2)]
+	stp	x4, x5,   [x18, #CPU_XREG_OFFSET(4)]
+	stp	x6, x7,   [x18, #CPU_XREG_OFFSET(6)]
+	stp	x8, x9,   [x18, #CPU_XREG_OFFSET(8)]
+	stp	x10, x11, [x18, #CPU_XREG_OFFSET(10)]
+	stp	x12, x13, [x18, #CPU_XREG_OFFSET(12)]
+	stp	x14, x15, [x18, #CPU_XREG_OFFSET(14)]
+	stp	x16, x17, [x18, #CPU_XREG_OFFSET(16)]
+
+	ret
+SYM_CODE_END(__kvm_hyp_host_forward_smc)