linux_dsm_epyc7002/arch/arm64/kvm/reset.c
Shannon Zhao f577f6c2a6 arm64: KVM: Introduce per-vcpu kvm device controls
In some cases it needs to get/set attributes specific to a vcpu and so
needs something else than ONE_REG.

Let's copy the KVM_DEVICE approach, and define the respective ioctls
for the vcpu file descriptor.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29 18:34:21 +00:00

133 lines
3.1 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 <linux/hw_breakpoint.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_system_reg(SYS_ID_AA64PFR0_EL1);
return !!(pfr0 & 0x20);
}
/**
* kvm_arch_dev_ioctl_check_extension
*
* We currently assume that the number of HW registers is uniform
* across all CPUs (see cpuinfo_sanity_check).
*/
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;
case KVM_CAP_GUEST_DEBUG_HW_BPS:
r = get_num_brps();
break;
case KVM_CAP_GUEST_DEBUG_HW_WPS:
r = get_num_wrps();
break;
case KVM_CAP_ARM_PMU_V3:
r = kvm_arm_support_pmu_v3();
break;
case KVM_CAP_SET_GUEST_DEBUG:
case KVM_CAP_VCPU_ATTRIBUTES:
r = 1;
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;
} 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 PMU */
kvm_pmu_vcpu_reset(vcpu);
/* Reset timer */
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
}