arm: Remove 32bit KVM host support

That's it. Remove all references to KVM itself, and document
that although it is no more, the ABI between SVC and HYP still
exists.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>

1 files changed, 0 insertions, 121 deletions

diff --git a/arch/arm/kvm/hyp/entry.S b/arch/arm/kvm/hyp/entry.S
deleted file mode 100644
index 4bd1f6a74180..000000000000
--- a/arch/arm/kvm/hyp/entry.S
+++ /dev/null
@@ -1,121 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2016 - ARM Ltd
- * Author: Marc Zyngier <marc.zyngier@arm.com>
-*/
-
-#include <linux/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/kvm_arm.h>
-#include <asm/kvm_asm.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
-	mrs	r1, SPSR
-	mrs	r2, ELR_hyp
-	mrc	p15, 4, r3, c5, c2, 0	@ HSR
-
-	/*
-	 * Force loads and stores to complete before unmasking aborts
-	 * and forcing the delivery of the exception. This gives us a
-	 * single instruction window, which the handler will try to
-	 * match.
-	 */
-	dsb	sy
-	cpsie	a
-
-	.global	abort_guest_exit_start
-abort_guest_exit_start:
-
-	isb
-
-	.global	abort_guest_exit_end
-abort_guest_exit_end:
-
-	/*
-	 * If we took an abort, r0[31] will be set, and cmp will set
-	 * the N bit in PSTATE.
-	 */
-	cmp	r0, #0
-	msrmi	SPSR_cxsf, r1
-	msrmi	ELR_hyp, r2
-	mcrmi	p15, 4, r3, c5, c2, 0	@ HSR
-
-	bx	lr
-ENDPROC(__guest_exit)
-
-/*
- * If VFPv3 support is not available, then we will not switch the VFP
- * registers; however cp10 and cp11 accesses will still trap and fallback
- * to the regular coprocessor emulation code, which currently will
- * inject an undefined exception to the guest.
- */
-#ifdef CONFIG_VFPv3
-ENTRY(__vfp_guest_restore)
-	push	{r3, r4, lr}
-
-	@ NEON/VFP used.  Turn on VFP access.
-	mrc	p15, 4, r1, c1, c1, 2		@ HCPTR
-	bic	r1, r1, #(HCPTR_TCP(10) | HCPTR_TCP(11))
-	mcr	p15, 4, r1, c1, c1, 2		@ HCPTR
-	isb
-
-	@ Switch VFP/NEON hardware state to the guest's
-	mov	r4, r0
-	ldr	r0, [r0, #VCPU_HOST_CTXT]
-	add	r0, r0, #CPU_CTXT_VFP
-	bl	__vfp_save_state
-	add	r0, r4, #(VCPU_GUEST_CTXT + CPU_CTXT_VFP)
-	bl	__vfp_restore_state
-
-	pop	{r3, r4, lr}
-	pop	{r0, r1, r2}
-	clrex
-	eret
-ENDPROC(__vfp_guest_restore)
-#endif
-
-	.popsection
-