KVM: arm64: Update context references from host to hyp

Hyp now has its own nominal context for saving and restoring its state
when switching to and from a guest. Update the related comments and
utilities to match the new name.
Signed-off-by: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200915104643.2543892-10-ascull@google.com

arch/arm64/include/asm/kvm_ptrauth.h

@@ -60,7 +60,7 @@
 .endm
 
 /*
- * Both ptrauth_switch_to_guest and ptrauth_switch_to_host macros will
+ * Both ptrauth_switch_to_guest and ptrauth_switch_to_hyp macros will
  * check for the presence ARM64_HAS_ADDRESS_AUTH, which is defined as
  * (ARM64_HAS_ADDRESS_AUTH_ARCH || ARM64_HAS_ADDRESS_AUTH_IMP_DEF) and
  * then proceed ahead with the save/restore of Pointer Authentication
@@ -78,7 +78,7 @@ alternative_else_nop_endif
 .L__skip_switch\@:
 .endm
 
-.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
+.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
 alternative_if_not ARM64_HAS_ADDRESS_AUTH
 	b	.L__skip_switch\@
 alternative_else_nop_endif
@@ -96,7 +96,7 @@ alternative_else_nop_endif
 #else /* !CONFIG_ARM64_PTR_AUTH */
 .macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
 .endm
-.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
+.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
 .endm
 #endif /* CONFIG_ARM64_PTR_AUTH */
 #endif /* __ASSEMBLY__ */

arch/arm64/kvm/hyp/entry.S

@@ -66,16 +66,16 @@ SYM_FUNC_START(__guest_enter)
 
 	hyp_adr_this_cpu x1, kvm_hyp_ctxt, x2
 
-	// Store the host regs
+	// Store the hyp regs
 	save_callee_saved_regs x1
 
-	// Save the host's sp_el0
+	// Save hyp's sp_el0
 	save_sp_el0	x1, x2
 
-	// Now the host state is stored if we have a pending RAS SError it must
-	// affect the host. If any asynchronous exception is pending we defer
-	// the guest entry. The DSB isn't necessary before v8.2 as any SError
-	// would be fatal.
+	// Now the hyp state is stored if we have a pending RAS SError it must
+	// affect the host or hyp. If any asynchronous exception is pending we
+	// defer the guest entry. The DSB isn't necessary before v8.2 as any
+	// SError would be fatal.
 alternative_if ARM64_HAS_RAS_EXTN
 	dsb	nshst
 	isb
@@ -150,17 +150,17 @@ SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
 
 	hyp_adr_this_cpu x2, kvm_hyp_ctxt, x3
 
-	// Macro ptrauth_switch_to_guest format:
-	// 	ptrauth_switch_to_host(guest cxt, host cxt, tmp1, tmp2, tmp3)
+	// Macro ptrauth_switch_to_hyp format:
+	// 	ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
 	// The below macro to save/restore keys is not implemented in C code
 	// as it may cause Pointer Authentication key signing mismatch errors
 	// when this feature is enabled for kernel code.
-	ptrauth_switch_to_host x1, x2, x3, x4, x5
+	ptrauth_switch_to_hyp x1, x2, x3, x4, x5
 
-	// Restore the hosts's sp_el0
+	// Restore hyp's sp_el0
 	restore_sp_el0 x2, x3
 
-	// Now restore the host regs
+	// Now restore the hyp regs
 	restore_callee_saved_regs x2
 
 alternative_if ARM64_HAS_RAS_EXTN