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linux_dsm_epyc7002/arch/arm/kvm/emulate.c

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KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
/*
* 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, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
KVM: ARM: Emulation framework and CP15 emulation Adds a new important function in the main KVM/ARM code called handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns from guest execution. This function examines the Hyp-Syndrome-Register (HSR), which contains information telling KVM what caused the exit from the guest. Some of the reasons for an exit are CP15 accesses, which are not allowed from the guest and this commit handles these exits by emulating the intended operation in software and skipping the guest instruction. Minor notes about the coproc register reset: 1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our table, at cost of 4 bytes per vcpu. 2) Added comments on the table indicating how we handle each register, for simplicity of understanding. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:09 +07:00
#include <linux/mm.h>
#include <linux/kvm_host.h>
#include <asm/kvm_arm.h>
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
#include <asm/kvm_emulate.h>
ARM: KVM: move kvm_condition_valid to emulate.c This is really hardware emulation, and as such it better be with its little friends. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-09 01:13:18 +07:00
#include <asm/opcodes.h>
KVM: ARM: Emulation framework and CP15 emulation Adds a new important function in the main KVM/ARM code called handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns from guest execution. This function examines the Hyp-Syndrome-Register (HSR), which contains information telling KVM what caused the exit from the guest. Some of the reasons for an exit are CP15 accesses, which are not allowed from the guest and this commit handles these exits by emulating the intended operation in software and skipping the guest instruction. Minor notes about the coproc register reset: 1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our table, at cost of 4 bytes per vcpu. 2) Added comments on the table indicating how we handle each register, for simplicity of understanding. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:09 +07:00
#include <trace/events/kvm.h>
#include "trace.h"
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
#define VCPU_NR_MODES 6
#define VCPU_REG_OFFSET_USR 0
#define VCPU_REG_OFFSET_FIQ 1
#define VCPU_REG_OFFSET_IRQ 2
#define VCPU_REG_OFFSET_SVC 3
#define VCPU_REG_OFFSET_ABT 4
#define VCPU_REG_OFFSET_UND 5
#define REG_OFFSET(_reg) \
(offsetof(struct kvm_regs, _reg) / sizeof(u32))
#define USR_REG_OFFSET(_num) REG_OFFSET(usr_regs.uregs[_num])
static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][15] = {
/* USR/SYS Registers */
[VCPU_REG_OFFSET_USR] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
},
/* FIQ Registers */
[VCPU_REG_OFFSET_FIQ] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7),
REG_OFFSET(fiq_regs[0]), /* r8 */
REG_OFFSET(fiq_regs[1]), /* r9 */
REG_OFFSET(fiq_regs[2]), /* r10 */
REG_OFFSET(fiq_regs[3]), /* r11 */
REG_OFFSET(fiq_regs[4]), /* r12 */
REG_OFFSET(fiq_regs[5]), /* r13 */
REG_OFFSET(fiq_regs[6]), /* r14 */
},
/* IRQ Registers */
[VCPU_REG_OFFSET_IRQ] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
USR_REG_OFFSET(12),
REG_OFFSET(irq_regs[0]), /* r13 */
REG_OFFSET(irq_regs[1]), /* r14 */
},
/* SVC Registers */
[VCPU_REG_OFFSET_SVC] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
USR_REG_OFFSET(12),
REG_OFFSET(svc_regs[0]), /* r13 */
REG_OFFSET(svc_regs[1]), /* r14 */
},
/* ABT Registers */
[VCPU_REG_OFFSET_ABT] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
USR_REG_OFFSET(12),
REG_OFFSET(abt_regs[0]), /* r13 */
REG_OFFSET(abt_regs[1]), /* r14 */
},
/* UND Registers */
[VCPU_REG_OFFSET_UND] = {
USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
USR_REG_OFFSET(12),
REG_OFFSET(und_regs[0]), /* r13 */
REG_OFFSET(und_regs[1]), /* r14 */
},
};
/*
* Return a pointer to the register number valid in the current mode of
* the virtual CPU.
*/
ARM: KVM: convert GP registers from u32 to unsigned long On 32bit ARM, unsigned long is guaranteed to be a 32bit quantity. On 64bit ARM, it is a 64bit quantity. In order to be able to share code between the two architectures, convert the registers to be unsigned long, so the core code can be oblivious of the change. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-10-03 17:17:02 +07:00
unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num)
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
{
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs;
ARM: KVM: convert GP registers from u32 to unsigned long On 32bit ARM, unsigned long is guaranteed to be a 32bit quantity. On 64bit ARM, it is a 64bit quantity. In order to be able to share code between the two architectures, convert the registers to be unsigned long, so the core code can be oblivious of the change. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-10-03 17:17:02 +07:00
unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
switch (mode) {
case USR_MODE...SVC_MODE:
mode &= ~MODE32_BIT; /* 0 ... 3 */
break;
case ABT_MODE:
mode = VCPU_REG_OFFSET_ABT;
break;
case UND_MODE:
mode = VCPU_REG_OFFSET_UND;
break;
case SYSTEM_MODE:
mode = VCPU_REG_OFFSET_USR;
break;
default:
BUG();
}
return reg_array + vcpu_reg_offsets[mode][reg_num];
}
/*
* Return the SPSR for the current mode of the virtual CPU.
*/
ARM: KVM: convert GP registers from u32 to unsigned long On 32bit ARM, unsigned long is guaranteed to be a 32bit quantity. On 64bit ARM, it is a 64bit quantity. In order to be able to share code between the two architectures, convert the registers to be unsigned long, so the core code can be oblivious of the change. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-10-03 17:17:02 +07:00
unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu)
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
{
ARM: KVM: convert GP registers from u32 to unsigned long On 32bit ARM, unsigned long is guaranteed to be a 32bit quantity. On 64bit ARM, it is a 64bit quantity. In order to be able to share code between the two architectures, convert the registers to be unsigned long, so the core code can be oblivious of the change. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-10-03 17:17:02 +07:00
unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
switch (mode) {
case SVC_MODE:
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
return &vcpu->arch.ctxt.gp_regs.KVM_ARM_SVC_spsr;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
case ABT_MODE:
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
return &vcpu->arch.ctxt.gp_regs.KVM_ARM_ABT_spsr;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
case UND_MODE:
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
return &vcpu->arch.ctxt.gp_regs.KVM_ARM_UND_spsr;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
case IRQ_MODE:
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
return &vcpu->arch.ctxt.gp_regs.KVM_ARM_IRQ_spsr;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
case FIQ_MODE:
ARM: KVM: Move GP registers into the CPU context structure Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-01-03 18:26:01 +07:00
return &vcpu->arch.ctxt.gp_regs.KVM_ARM_FIQ_spsr;
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:06 +07:00
default:
BUG();
}
}
KVM: ARM: Emulation framework and CP15 emulation Adds a new important function in the main KVM/ARM code called handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns from guest execution. This function examines the Hyp-Syndrome-Register (HSR), which contains information telling KVM what caused the exit from the guest. Some of the reasons for an exit are CP15 accesses, which are not allowed from the guest and this commit handles these exits by emulating the intended operation in software and skipping the guest instruction. Minor notes about the coproc register reset: 1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our table, at cost of 4 bytes per vcpu. 2) Added comments on the table indicating how we handle each register, for simplicity of understanding. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 06:28:09 +07:00
/******************************************************************************
* Inject exceptions into the guest
*/
arm: KVM: Add Virtual Abort injection helper Now that we're able to context switch the HCR.VA bit, let's introduce a helper that injects an Abort into a vcpu. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2016-09-06 20:02:09 +07:00
/**
* kvm_inject_vabt - inject an async abort / SError into the guest
* @vcpu: The VCPU to receive the exception
*
* It is assumed that this code is called from the VCPU thread and that the
* VCPU therefore is not currently executing guest code.
*/
void kvm_inject_vabt(struct kvm_vcpu *vcpu)
{
KVM: arm/arm64: Get rid of vcpu->arch.irq_lines We currently have a separate read-modify-write of the HCR_EL2 on entry to the guest for the sole purpose of setting the VF and VI bits, if set. Since this is most rarely the case (only when using userspace IRQ chip and interrupts are in flight), let's get rid of this operation and instead modify the bits in the vcpu->arch.hcr[_el2] directly when needed. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-08-03 17:09:05 +07:00
*vcpu_hcr(vcpu) |= HCR_VA;
arm: KVM: Add Virtual Abort injection helper Now that we're able to context switch the HCR.VA bit, let's introduce a helper that injects an Abort into a vcpu. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2016-09-06 20:02:09 +07:00
}
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