62a89c4495
Provide the necessary infrastructure to trap coprocessor accesses that occur when running 32bit guests. Also wire SMC and HVC trapped in 32bit mode while were at it. Reviewed-by: Christopher Covington <cov@codeaurora.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*
|
|
* Copyright (C) 2012,2013 - ARM Ltd
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* Derived from arch/arm/kvm/handle_exit.c:
|
|
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
|
|
* Author: Christoffer Dall <c.dall@virtualopensystems.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/kvm.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <asm/kvm_emulate.h>
|
|
#include <asm/kvm_coproc.h>
|
|
#include <asm/kvm_mmu.h>
|
|
#include <asm/kvm_psci.h>
|
|
|
|
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
|
|
|
|
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
if (kvm_psci_call(vcpu))
|
|
return 1;
|
|
|
|
kvm_inject_undefined(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
if (kvm_psci_call(vcpu))
|
|
return 1;
|
|
|
|
kvm_inject_undefined(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest
|
|
* @vcpu: the vcpu pointer
|
|
*
|
|
* 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_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
kvm_vcpu_block(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static exit_handle_fn arm_exit_handlers[] = {
|
|
[ESR_EL2_EC_WFI] = kvm_handle_wfi,
|
|
[ESR_EL2_EC_CP15_32] = kvm_handle_cp15_32,
|
|
[ESR_EL2_EC_CP15_64] = kvm_handle_cp15_64,
|
|
[ESR_EL2_EC_CP14_MR] = kvm_handle_cp14_access,
|
|
[ESR_EL2_EC_CP14_LS] = kvm_handle_cp14_load_store,
|
|
[ESR_EL2_EC_CP14_64] = kvm_handle_cp14_access,
|
|
[ESR_EL2_EC_HVC32] = handle_hvc,
|
|
[ESR_EL2_EC_SMC32] = handle_smc,
|
|
[ESR_EL2_EC_HVC64] = handle_hvc,
|
|
[ESR_EL2_EC_SMC64] = handle_smc,
|
|
[ESR_EL2_EC_SYS64] = kvm_handle_sys_reg,
|
|
[ESR_EL2_EC_IABT] = kvm_handle_guest_abort,
|
|
[ESR_EL2_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);
|
|
|
|
if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
|
|
!arm_exit_handlers[hsr_ec]) {
|
|
kvm_err("Unkown exception class: hsr: %#08x\n",
|
|
(unsigned int)kvm_vcpu_get_hsr(vcpu));
|
|
BUG();
|
|
}
|
|
|
|
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;
|
|
|
|
switch (exception_index) {
|
|
case ARM_EXCEPTION_IRQ:
|
|
return 1;
|
|
case ARM_EXCEPTION_TRAP:
|
|
/*
|
|
* 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);
|
|
default:
|
|
kvm_pr_unimpl("Unsupported exception type: %d",
|
|
exception_index);
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
}
|