113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 2012,2013 - ARM Ltd
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* Derived from arch/arm/kvm/reset.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/errno.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/kvm.h>
|
|
|
|
#include <kvm/arm_arch_timer.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/kvm_arm.h>
|
|
#include <asm/kvm_coproc.h>
|
|
|
|
/*
|
|
* ARMv8 Reset Values
|
|
*/
|
|
static const struct kvm_regs default_regs_reset = {
|
|
.regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |
|
|
PSR_F_BIT | PSR_D_BIT),
|
|
};
|
|
|
|
static const struct kvm_regs default_regs_reset32 = {
|
|
.regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT |
|
|
COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
|
|
};
|
|
|
|
static const struct kvm_irq_level default_vtimer_irq = {
|
|
.irq = 27,
|
|
.level = 1,
|
|
};
|
|
|
|
static bool cpu_has_32bit_el1(void)
|
|
{
|
|
u64 pfr0;
|
|
|
|
pfr0 = read_cpuid(ID_AA64PFR0_EL1);
|
|
return !!(pfr0 & 0x20);
|
|
}
|
|
|
|
int kvm_arch_dev_ioctl_check_extension(long ext)
|
|
{
|
|
int r;
|
|
|
|
switch (ext) {
|
|
case KVM_CAP_ARM_EL1_32BIT:
|
|
r = cpu_has_32bit_el1();
|
|
break;
|
|
default:
|
|
r = 0;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* kvm_reset_vcpu - sets core registers and sys_regs to reset value
|
|
* @vcpu: The VCPU pointer
|
|
*
|
|
* This function finds the right table above and sets the registers on
|
|
* the virtual CPU struct to their architectually defined reset
|
|
* values.
|
|
*/
|
|
int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
const struct kvm_irq_level *cpu_vtimer_irq;
|
|
const struct kvm_regs *cpu_reset;
|
|
|
|
switch (vcpu->arch.target) {
|
|
default:
|
|
if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
|
|
if (!cpu_has_32bit_el1())
|
|
return -EINVAL;
|
|
cpu_reset = &default_regs_reset32;
|
|
vcpu->arch.hcr_el2 &= ~HCR_RW;
|
|
} else {
|
|
cpu_reset = &default_regs_reset;
|
|
}
|
|
|
|
cpu_vtimer_irq = &default_vtimer_irq;
|
|
break;
|
|
}
|
|
|
|
/* Reset core registers */
|
|
memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
|
|
|
|
/* Reset system registers */
|
|
kvm_reset_sys_regs(vcpu);
|
|
|
|
/* Reset timer */
|
|
kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
|
|
|
|
return 0;
|
|
}
|