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92f35b751c
While parts of the VGIC support a large number of vcpus (we bravely allow up to 512), other parts are more limited. One of these limits is visible in the KVM_IRQ_LINE ioctl, which only allows 256 vcpus to be signalled when using the CPU or PPI types. Unfortunately, we've cornered ourselves badly by allocating all the bits in the irq field. Since the irq_type subfield (8 bit wide) is currently only taking the values 0, 1 and 2 (and we have been careful not to allow anything else), let's reduce this field to only 4 bits, and allocate the remaining 4 bits to a vcpu2_index, which acts as a multiplier: vcpu_id = 256 * vcpu2_index + vcpu_index With that, and a new capability (KVM_CAP_ARM_IRQ_LINE_LAYOUT_2) allowing this to be discovered, it becomes possible to inject PPIs to up to 4096 vcpus. But please just don't. Whilst we're there, add a clarification about the use of KVM_IRQ_LINE on arm, which is not completely conditionned by KVM_CAP_IRQCHIP. Reported-by: Zenghui Yu <yuzenghui@huawei.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
314 lines
11 KiB
C
314 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __ARM_KVM_H__
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#define __ARM_KVM_H__
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#include <linux/types.h>
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#include <linux/psci.h>
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#include <asm/ptrace.h>
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#define __KVM_HAVE_GUEST_DEBUG
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#define __KVM_HAVE_IRQ_LINE
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#define __KVM_HAVE_READONLY_MEM
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#define __KVM_HAVE_VCPU_EVENTS
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#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
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#define KVM_REG_SIZE(id) \
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(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
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/* Valid for svc_regs, abt_regs, und_regs, irq_regs in struct kvm_regs */
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#define KVM_ARM_SVC_sp svc_regs[0]
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#define KVM_ARM_SVC_lr svc_regs[1]
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#define KVM_ARM_SVC_spsr svc_regs[2]
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#define KVM_ARM_ABT_sp abt_regs[0]
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#define KVM_ARM_ABT_lr abt_regs[1]
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#define KVM_ARM_ABT_spsr abt_regs[2]
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#define KVM_ARM_UND_sp und_regs[0]
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#define KVM_ARM_UND_lr und_regs[1]
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#define KVM_ARM_UND_spsr und_regs[2]
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#define KVM_ARM_IRQ_sp irq_regs[0]
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#define KVM_ARM_IRQ_lr irq_regs[1]
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#define KVM_ARM_IRQ_spsr irq_regs[2]
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/* Valid only for fiq_regs in struct kvm_regs */
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#define KVM_ARM_FIQ_r8 fiq_regs[0]
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#define KVM_ARM_FIQ_r9 fiq_regs[1]
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#define KVM_ARM_FIQ_r10 fiq_regs[2]
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#define KVM_ARM_FIQ_fp fiq_regs[3]
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#define KVM_ARM_FIQ_ip fiq_regs[4]
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#define KVM_ARM_FIQ_sp fiq_regs[5]
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#define KVM_ARM_FIQ_lr fiq_regs[6]
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#define KVM_ARM_FIQ_spsr fiq_regs[7]
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struct kvm_regs {
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struct pt_regs usr_regs; /* R0_usr - R14_usr, PC, CPSR */
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unsigned long svc_regs[3]; /* SP_svc, LR_svc, SPSR_svc */
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unsigned long abt_regs[3]; /* SP_abt, LR_abt, SPSR_abt */
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unsigned long und_regs[3]; /* SP_und, LR_und, SPSR_und */
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unsigned long irq_regs[3]; /* SP_irq, LR_irq, SPSR_irq */
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unsigned long fiq_regs[8]; /* R8_fiq - R14_fiq, SPSR_fiq */
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};
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/* Supported Processor Types */
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#define KVM_ARM_TARGET_CORTEX_A15 0
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#define KVM_ARM_TARGET_CORTEX_A7 1
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#define KVM_ARM_NUM_TARGETS 2
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/* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */
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#define KVM_ARM_DEVICE_TYPE_SHIFT 0
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#define KVM_ARM_DEVICE_TYPE_MASK (0xffff << KVM_ARM_DEVICE_TYPE_SHIFT)
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#define KVM_ARM_DEVICE_ID_SHIFT 16
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#define KVM_ARM_DEVICE_ID_MASK (0xffff << KVM_ARM_DEVICE_ID_SHIFT)
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/* Supported device IDs */
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#define KVM_ARM_DEVICE_VGIC_V2 0
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/* Supported VGIC address types */
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#define KVM_VGIC_V2_ADDR_TYPE_DIST 0
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#define KVM_VGIC_V2_ADDR_TYPE_CPU 1
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#define KVM_VGIC_V2_DIST_SIZE 0x1000
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#define KVM_VGIC_V2_CPU_SIZE 0x2000
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/* Supported VGICv3 address types */
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#define KVM_VGIC_V3_ADDR_TYPE_DIST 2
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#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3
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#define KVM_VGIC_ITS_ADDR_TYPE 4
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#define KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION 5
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#define KVM_VGIC_V3_DIST_SIZE SZ_64K
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#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
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#define KVM_VGIC_V3_ITS_SIZE (2 * SZ_64K)
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#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
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#define KVM_ARM_VCPU_PSCI_0_2 1 /* CPU uses PSCI v0.2 */
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struct kvm_vcpu_init {
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__u32 target;
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__u32 features[7];
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};
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struct kvm_sregs {
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};
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struct kvm_fpu {
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};
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struct kvm_guest_debug_arch {
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};
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struct kvm_debug_exit_arch {
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};
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struct kvm_sync_regs {
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/* Used with KVM_CAP_ARM_USER_IRQ */
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__u64 device_irq_level;
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};
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struct kvm_arch_memory_slot {
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};
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/* for KVM_GET/SET_VCPU_EVENTS */
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struct kvm_vcpu_events {
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struct {
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__u8 serror_pending;
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__u8 serror_has_esr;
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/* Align it to 8 bytes */
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__u8 pad[6];
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__u64 serror_esr;
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} exception;
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__u32 reserved[12];
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};
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/* If you need to interpret the index values, here is the key: */
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#define KVM_REG_ARM_COPROC_MASK 0x000000000FFF0000
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#define KVM_REG_ARM_COPROC_SHIFT 16
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#define KVM_REG_ARM_32_OPC2_MASK 0x0000000000000007
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#define KVM_REG_ARM_32_OPC2_SHIFT 0
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#define KVM_REG_ARM_OPC1_MASK 0x0000000000000078
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#define KVM_REG_ARM_OPC1_SHIFT 3
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#define KVM_REG_ARM_CRM_MASK 0x0000000000000780
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#define KVM_REG_ARM_CRM_SHIFT 7
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#define KVM_REG_ARM_32_CRN_MASK 0x0000000000007800
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#define KVM_REG_ARM_32_CRN_SHIFT 11
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/*
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* For KVM currently all guest registers are nonsecure, but we reserve a bit
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* in the encoding to distinguish secure from nonsecure for AArch32 system
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* registers that are banked by security. This is 1 for the secure banked
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* register, and 0 for the nonsecure banked register or if the register is
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* not banked by security.
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*/
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#define KVM_REG_ARM_SECURE_MASK 0x0000000010000000
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#define KVM_REG_ARM_SECURE_SHIFT 28
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#define ARM_CP15_REG_SHIFT_MASK(x,n) \
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(((x) << KVM_REG_ARM_ ## n ## _SHIFT) & KVM_REG_ARM_ ## n ## _MASK)
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#define __ARM_CP15_REG(op1,crn,crm,op2) \
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(KVM_REG_ARM | (15 << KVM_REG_ARM_COPROC_SHIFT) | \
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ARM_CP15_REG_SHIFT_MASK(op1, OPC1) | \
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ARM_CP15_REG_SHIFT_MASK(crn, 32_CRN) | \
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ARM_CP15_REG_SHIFT_MASK(crm, CRM) | \
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ARM_CP15_REG_SHIFT_MASK(op2, 32_OPC2))
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#define ARM_CP15_REG32(...) (__ARM_CP15_REG(__VA_ARGS__) | KVM_REG_SIZE_U32)
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#define __ARM_CP15_REG64(op1,crm) \
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(__ARM_CP15_REG(op1, 0, crm, 0) | KVM_REG_SIZE_U64)
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#define ARM_CP15_REG64(...) __ARM_CP15_REG64(__VA_ARGS__)
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/* PL1 Physical Timer Registers */
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#define KVM_REG_ARM_PTIMER_CTL ARM_CP15_REG32(0, 14, 2, 1)
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#define KVM_REG_ARM_PTIMER_CNT ARM_CP15_REG64(0, 14)
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#define KVM_REG_ARM_PTIMER_CVAL ARM_CP15_REG64(2, 14)
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/* Virtual Timer Registers */
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#define KVM_REG_ARM_TIMER_CTL ARM_CP15_REG32(0, 14, 3, 1)
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#define KVM_REG_ARM_TIMER_CNT ARM_CP15_REG64(1, 14)
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#define KVM_REG_ARM_TIMER_CVAL ARM_CP15_REG64(3, 14)
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/* Normal registers are mapped as coprocessor 16. */
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#define KVM_REG_ARM_CORE (0x0010 << KVM_REG_ARM_COPROC_SHIFT)
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#define KVM_REG_ARM_CORE_REG(name) (offsetof(struct kvm_regs, name) / 4)
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/* Some registers need more space to represent values. */
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#define KVM_REG_ARM_DEMUX (0x0011 << KVM_REG_ARM_COPROC_SHIFT)
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#define KVM_REG_ARM_DEMUX_ID_MASK 0x000000000000FF00
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#define KVM_REG_ARM_DEMUX_ID_SHIFT 8
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#define KVM_REG_ARM_DEMUX_ID_CCSIDR (0x00 << KVM_REG_ARM_DEMUX_ID_SHIFT)
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#define KVM_REG_ARM_DEMUX_VAL_MASK 0x00000000000000FF
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#define KVM_REG_ARM_DEMUX_VAL_SHIFT 0
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/* VFP registers: we could overload CP10 like ARM does, but that's ugly. */
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#define KVM_REG_ARM_VFP (0x0012 << KVM_REG_ARM_COPROC_SHIFT)
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#define KVM_REG_ARM_VFP_MASK 0x000000000000FFFF
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#define KVM_REG_ARM_VFP_BASE_REG 0x0
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#define KVM_REG_ARM_VFP_FPSID 0x1000
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#define KVM_REG_ARM_VFP_FPSCR 0x1001
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#define KVM_REG_ARM_VFP_MVFR1 0x1006
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#define KVM_REG_ARM_VFP_MVFR0 0x1007
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#define KVM_REG_ARM_VFP_FPEXC 0x1008
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#define KVM_REG_ARM_VFP_FPINST 0x1009
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#define KVM_REG_ARM_VFP_FPINST2 0x100A
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/* KVM-as-firmware specific pseudo-registers */
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#define KVM_REG_ARM_FW (0x0014 << KVM_REG_ARM_COPROC_SHIFT)
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#define KVM_REG_ARM_FW_REG(r) (KVM_REG_ARM | KVM_REG_SIZE_U64 | \
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KVM_REG_ARM_FW | ((r) & 0xffff))
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#define KVM_REG_ARM_PSCI_VERSION KVM_REG_ARM_FW_REG(0)
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1 KVM_REG_ARM_FW_REG(1)
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/* Higher values mean better protection. */
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL 0
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL 1
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED 2
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2 KVM_REG_ARM_FW_REG(2)
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/* Higher values mean better protection. */
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL 0
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN 1
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL 2
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED 3
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#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED (1U << 4)
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/* Device Control API: ARM VGIC */
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#define KVM_DEV_ARM_VGIC_GRP_ADDR 0
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#define KVM_DEV_ARM_VGIC_GRP_DIST_REGS 1
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#define KVM_DEV_ARM_VGIC_GRP_CPU_REGS 2
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#define KVM_DEV_ARM_VGIC_CPUID_SHIFT 32
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#define KVM_DEV_ARM_VGIC_CPUID_MASK (0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT)
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#define KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT 32
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#define KVM_DEV_ARM_VGIC_V3_MPIDR_MASK \
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(0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT)
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#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
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#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
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#define KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK (0xffff)
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#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
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#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
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#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
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#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
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#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
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#define KVM_DEV_ARM_VGIC_GRP_ITS_REGS 8
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#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
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#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
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(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
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#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
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#define VGIC_LEVEL_INFO_LINE_LEVEL 0
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/* Device Control API on vcpu fd */
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#define KVM_ARM_VCPU_PMU_V3_CTRL 0
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#define KVM_ARM_VCPU_PMU_V3_IRQ 0
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#define KVM_ARM_VCPU_PMU_V3_INIT 1
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#define KVM_ARM_VCPU_TIMER_CTRL 1
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#define KVM_ARM_VCPU_TIMER_IRQ_VTIMER 0
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#define KVM_ARM_VCPU_TIMER_IRQ_PTIMER 1
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#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
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#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
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#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
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#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
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#define KVM_DEV_ARM_ITS_CTRL_RESET 4
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/* KVM_IRQ_LINE irq field index values */
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#define KVM_ARM_IRQ_VCPU2_SHIFT 28
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#define KVM_ARM_IRQ_VCPU2_MASK 0xf
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#define KVM_ARM_IRQ_TYPE_SHIFT 24
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#define KVM_ARM_IRQ_TYPE_MASK 0xf
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#define KVM_ARM_IRQ_VCPU_SHIFT 16
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#define KVM_ARM_IRQ_VCPU_MASK 0xff
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#define KVM_ARM_IRQ_NUM_SHIFT 0
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#define KVM_ARM_IRQ_NUM_MASK 0xffff
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/* irq_type field */
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#define KVM_ARM_IRQ_TYPE_CPU 0
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#define KVM_ARM_IRQ_TYPE_SPI 1
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#define KVM_ARM_IRQ_TYPE_PPI 2
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/* out-of-kernel GIC cpu interrupt injection irq_number field */
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#define KVM_ARM_IRQ_CPU_IRQ 0
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#define KVM_ARM_IRQ_CPU_FIQ 1
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/*
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* This used to hold the highest supported SPI, but it is now obsolete
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* and only here to provide source code level compatibility with older
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* userland. The highest SPI number can be set via KVM_DEV_ARM_VGIC_GRP_NR_IRQS.
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*/
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#ifndef __KERNEL__
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#define KVM_ARM_IRQ_GIC_MAX 127
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#endif
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/* One single KVM irqchip, ie. the VGIC */
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#define KVM_NR_IRQCHIPS 1
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/* PSCI interface */
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#define KVM_PSCI_FN_BASE 0x95c1ba5e
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#define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
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#define KVM_PSCI_FN_CPU_SUSPEND KVM_PSCI_FN(0)
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#define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1)
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#define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
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#define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
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#define KVM_PSCI_RET_SUCCESS PSCI_RET_SUCCESS
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#define KVM_PSCI_RET_NI PSCI_RET_NOT_SUPPORTED
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#define KVM_PSCI_RET_INVAL PSCI_RET_INVALID_PARAMS
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#define KVM_PSCI_RET_DENIED PSCI_RET_DENIED
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#endif /* __ARM_KVM_H__ */
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