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, 175 deletions

diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
deleted file mode 100644
index e58a89d2f13f..000000000000
--- a/arch/arm/kvm/handle_exit.c
+++ /dev/null
@@ -1,175 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2012 - Virtual Open Systems and Columbia University
- * Author: Christoffer Dall <c.dall@virtualopensystems.com>
- */
-
-#include <linux/kvm.h>
-#include <linux/kvm_host.h>
-#include <asm/kvm_emulate.h>
-#include <asm/kvm_coproc.h>
-#include <asm/kvm_mmu.h>
-#include <kvm/arm_hypercalls.h>
-#include <trace/events/kvm.h>
-
-#include "trace.h"
-
-typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
-
-static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-	int ret;
-
-	trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
-		      kvm_vcpu_hvc_get_imm(vcpu));
-	vcpu->stat.hvc_exit_stat++;
-
-	ret = kvm_hvc_call_handler(vcpu);
-	if (ret < 0) {
-		vcpu_set_reg(vcpu, 0, ~0UL);
-		return 1;
-	}
-
-	return ret;
-}
-
-static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-	/*
-	 * "If an SMC instruction executed at Non-secure EL1 is
-	 * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
-	 * Trap exception, not a Secure Monitor Call exception [...]"
-	 *
-	 * We need to advance the PC after the trap, as it would
-	 * otherwise return to the same address...
-	 */
-	vcpu_set_reg(vcpu, 0, ~0UL);
-	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
-	return 1;
-}
-
-/**
- * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
- * @vcpu:	the vcpu pointer
- * @run:	the kvm_run structure pointer
- *
- * WFE: Yield the CPU and come back to this vcpu when the scheduler
- * decides to.
- * WFI: Simply call kvm_vcpu_block(), which will halt execution of
- * world-switches and schedule other host processes until there is an
- * incoming IRQ or FIQ to the VM.
- */
-static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-	if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) {
-		trace_kvm_wfx(*vcpu_pc(vcpu), true);
-		vcpu->stat.wfe_exit_stat++;
-		kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
-	} else {
-		trace_kvm_wfx(*vcpu_pc(vcpu), false);
-		vcpu->stat.wfi_exit_stat++;
-		kvm_vcpu_block(vcpu);
-		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-	}
-
-	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
-
-	return 1;
-}
-
-static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-	u32 hsr = kvm_vcpu_get_hsr(vcpu);
-
-	kvm_pr_unimpl("Unknown exception class: hsr: %#08x\n",
-		      hsr);
-
-	kvm_inject_undefined(vcpu);
-	return 1;
-}
-
-static exit_handle_fn arm_exit_handlers[] = {
-	[0 ... HSR_EC_MAX]	= kvm_handle_unknown_ec,
-	[HSR_EC_WFI]		= kvm_handle_wfx,
-	[HSR_EC_CP15_32]	= kvm_handle_cp15_32,
-	[HSR_EC_CP15_64]	= kvm_handle_cp15_64,
-	[HSR_EC_CP14_MR]	= kvm_handle_cp14_32,
-	[HSR_EC_CP14_LS]	= kvm_handle_cp14_load_store,
-	[HSR_EC_CP14_64]	= kvm_handle_cp14_64,
-	[HSR_EC_CP_0_13]	= kvm_handle_cp_0_13_access,
-	[HSR_EC_CP10_ID]	= kvm_handle_cp10_id,
-	[HSR_EC_HVC]		= handle_hvc,
-	[HSR_EC_SMC]		= handle_smc,
-	[HSR_EC_IABT]		= kvm_handle_guest_abort,
-	[HSR_EC_DABT]		= kvm_handle_guest_abort,
-};
-
-static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
-{
-	u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
-
-	return arm_exit_handlers[hsr_ec];
-}
-
-/*
- * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
- * proper exit to userspace.
- */
-int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
-		       int exception_index)
-{
-	exit_handle_fn exit_handler;
-
-	if (ARM_ABORT_PENDING(exception_index)) {
-		u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
-
-		/*
-		 * HVC/SMC already have an adjusted PC, which we need
-		 * to correct in order to return to after having
-		 * injected the abort.
-		 */
-		if (hsr_ec == HSR_EC_HVC || hsr_ec == HSR_EC_SMC) {
-			u32 adj =  kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2;
-			*vcpu_pc(vcpu) -= adj;
-		}
-
-		kvm_inject_vabt(vcpu);
-		return 1;
-	}
-
-	exception_index = ARM_EXCEPTION_CODE(exception_index);
-
-	switch (exception_index) {
-	case ARM_EXCEPTION_IRQ:
-		return 1;
-	case ARM_EXCEPTION_HVC:
-		/*
-		 * See ARM ARM B1.14.1: "Hyp traps on instructions
-		 * that fail their condition code check"
-		 */
-		if (!kvm_condition_valid(vcpu)) {
-			kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
-			return 1;
-		}
-
-		exit_handler = kvm_get_exit_handler(vcpu);
-
-		return exit_handler(vcpu, run);
-	case ARM_EXCEPTION_DATA_ABORT:
-		kvm_inject_vabt(vcpu);
-		return 1;
-	case ARM_EXCEPTION_HYP_GONE:
-		/*
-		 * HYP has been reset to the hyp-stub. This happens
-		 * when a guest is pre-empted by kvm_reboot()'s
-		 * shutdown call.
-		 */
-		run->exit_reason = KVM_EXIT_FAIL_ENTRY;
-		return 0;
-	default:
-		kvm_pr_unimpl("Unsupported exception type: %d",
-			      exception_index);
-		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-		return 0;
-	}
-}