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acrn-hypervisor/hypervisor/arch/x86/guest/vmsr.c
Zide Chen 44e9318c45 hv: vmsr: fix MISRA_C violations 
106D No prototype for non-static function.
  2 functions missing prototyle declarations in header file.

120S Use of bit operator on signed type.
123S Use of underlying enum representation value.
  enum values are treated like unsigned integer in vmsr.c

Tracked-On: #861
Signed-off-by: Zide Chen <zide.chen@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
2018-12-16 14:52:22 +08:00

592 lines
15 KiB
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/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <hypervisor.h>
#include <ucode.h>
#define INTERCEPT_DISABLE (0U)
#define INTERCEPT_READ (1U << 0U)
#define INTERCEPT_WRITE (1U << 1U)
#define INTERCEPT_READ_WRITE (INTERCEPT_READ | INTERCEPT_WRITE)
static const uint32_t emulated_guest_msrs[NUM_GUEST_MSRS] = {
/*
* MSRs that trusty may touch and need isolation between secure and normal world
* This may include MSR_IA32_STAR, MSR_IA32_LSTAR, MSR_IA32_FMASK,
* MSR_IA32_KERNEL_GS_BASE, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_EIP
*
* Number of entries: NUM_WORLD_MSRS
*/
MSR_IA32_PAT,
MSR_IA32_TSC_ADJUST,
/*
* MSRs don't need isolation between worlds
* Number of entries: NUM_COMMON_MSRS
*/
MSR_IA32_TSC_DEADLINE,
MSR_IA32_BIOS_UPDT_TRIG,
MSR_IA32_BIOS_SIGN_ID,
MSR_IA32_TIME_STAMP_COUNTER,
MSR_IA32_APIC_BASE,
MSR_IA32_PERF_CTL
};
#define NUM_MTRR_MSRS 13U
static const uint32_t mtrr_msrs[NUM_MTRR_MSRS] = {
MSR_IA32_MTRR_CAP,
MSR_IA32_MTRR_DEF_TYPE,
MSR_IA32_MTRR_FIX64K_00000,
MSR_IA32_MTRR_FIX16K_80000,
MSR_IA32_MTRR_FIX16K_A0000,
MSR_IA32_MTRR_FIX4K_C0000,
MSR_IA32_MTRR_FIX4K_C8000,
MSR_IA32_MTRR_FIX4K_D0000,
MSR_IA32_MTRR_FIX4K_D8000,
MSR_IA32_MTRR_FIX4K_E0000,
MSR_IA32_MTRR_FIX4K_E8000,
MSR_IA32_MTRR_FIX4K_F0000,
MSR_IA32_MTRR_FIX4K_F8000
};
/* Following MSRs are intercepted, but it throws GPs for any guest accesses */
#define NUM_UNSUPPORTED_MSRS 76U
static const uint32_t unsupported_msrs[NUM_UNSUPPORTED_MSRS] = {
/* Variable MTRRs are not supported */
MSR_IA32_MTRR_PHYSBASE_0,
MSR_IA32_MTRR_PHYSMASK_0,
MSR_IA32_MTRR_PHYSBASE_1,
MSR_IA32_MTRR_PHYSMASK_1,
MSR_IA32_MTRR_PHYSBASE_2,
MSR_IA32_MTRR_PHYSMASK_2,
MSR_IA32_MTRR_PHYSBASE_3,
MSR_IA32_MTRR_PHYSMASK_3,
MSR_IA32_MTRR_PHYSBASE_4,
MSR_IA32_MTRR_PHYSMASK_4,
MSR_IA32_MTRR_PHYSBASE_5,
MSR_IA32_MTRR_PHYSMASK_5,
MSR_IA32_MTRR_PHYSBASE_6,
MSR_IA32_MTRR_PHYSMASK_6,
MSR_IA32_MTRR_PHYSBASE_7,
MSR_IA32_MTRR_PHYSMASK_7,
MSR_IA32_MTRR_PHYSBASE_8,
MSR_IA32_MTRR_PHYSMASK_8,
MSR_IA32_MTRR_PHYSBASE_9,
MSR_IA32_MTRR_PHYSMASK_9,
/* No level 2 VMX: CPUID.01H.ECX[5] */
MSR_IA32_VMX_BASIC,
MSR_IA32_VMX_PINBASED_CTLS,
MSR_IA32_VMX_PROCBASED_CTLS,
MSR_IA32_VMX_EXIT_CTLS,
MSR_IA32_VMX_ENTRY_CTLS,
MSR_IA32_VMX_MISC,
MSR_IA32_VMX_CR0_FIXED0,
MSR_IA32_VMX_CR0_FIXED1,
MSR_IA32_VMX_CR4_FIXED0,
MSR_IA32_VMX_CR4_FIXED1,
MSR_IA32_VMX_VMCS_ENUM,
MSR_IA32_VMX_PROCBASED_CTLS2,
MSR_IA32_VMX_EPT_VPID_CAP,
MSR_IA32_VMX_TRUE_PINBASED_CTLS,
MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
MSR_IA32_VMX_TRUE_EXIT_CTLS,
MSR_IA32_VMX_TRUE_ENTRY_CTLS,
MSR_IA32_VMX_VMFUNC,
/* SGX disabled: CPUID.12H.EAX[0], CPUID.07H.ECX[30] */
MSR_IA32_SGXLEPUBKEYHASH0,
MSR_IA32_SGXLEPUBKEYHASH1,
MSR_IA32_SGXLEPUBKEYHASH2,
MSR_IA32_SGXLEPUBKEYHASH3,
/* SGX disabled : CPUID.07H.EBX[2] */
MSR_IA32_SGX_SVN_STATUS,
/* SGX disabled : CPUID.12H.EAX[0] */
MSR_SGXOWNEREPOCH0,
MSR_SGXOWNEREPOCH1,
/* Performance Counters and Events: CPUID.0AH.EAX[15:8] */
MSR_IA32_PMC0,
MSR_IA32_PMC1,
MSR_IA32_PMC2,
MSR_IA32_PMC3,
MSR_IA32_PMC4,
MSR_IA32_PMC5,
MSR_IA32_PMC6,
MSR_IA32_PMC7,
MSR_IA32_PERFEVTSEL0,
MSR_IA32_PERFEVTSEL1,
MSR_IA32_PERFEVTSEL2,
MSR_IA32_PERFEVTSEL3,
MSR_IA32_A_PMC0,
MSR_IA32_A_PMC1,
MSR_IA32_A_PMC2,
MSR_IA32_A_PMC3,
MSR_IA32_A_PMC4,
MSR_IA32_A_PMC5,
MSR_IA32_A_PMC6,
MSR_IA32_A_PMC7,
/* CPUID.0AH.EAX[7:0] */
MSR_IA32_FIXED_CTR_CTL,
MSR_IA32_PERF_GLOBAL_STATUS,
MSR_IA32_PERF_GLOBAL_CTRL,
MSR_IA32_PERF_GLOBAL_OVF_CTRL,
MSR_IA32_PERF_GLOBAL_STATUS_SET,
MSR_IA32_PERF_GLOBAL_INUSE,
/* QOS Configuration disabled: CPUID.10H.ECX[2] */
MSR_IA32_L3_QOS_CFG,
MSR_IA32_L2_QOS_CFG,
/* RDT-M disabled: CPUID.07H.EBX[12], CPUID.07H.EBX[15] */
MSR_IA32_QM_EVTSEL,
MSR_IA32_QM_CTR,
MSR_IA32_PQR_ASSOC
/* RDT-A disabled: CPUID.07H.EBX[12], CPUID.10H */
/* MSR 0xC90 ... 0xD8F, not in this array */
};
#define NUM_X2APIC_MSRS 44U
static const uint32_t x2apic_msrs[NUM_X2APIC_MSRS] = {
MSR_IA32_EXT_XAPICID,
MSR_IA32_EXT_APIC_VERSION,
MSR_IA32_EXT_APIC_TPR,
MSR_IA32_EXT_APIC_PPR,
MSR_IA32_EXT_APIC_EOI,
MSR_IA32_EXT_APIC_LDR,
MSR_IA32_EXT_APIC_SIVR,
MSR_IA32_EXT_APIC_ISR0,
MSR_IA32_EXT_APIC_ISR1,
MSR_IA32_EXT_APIC_ISR2,
MSR_IA32_EXT_APIC_ISR3,
MSR_IA32_EXT_APIC_ISR4,
MSR_IA32_EXT_APIC_ISR5,
MSR_IA32_EXT_APIC_ISR6,
MSR_IA32_EXT_APIC_ISR7,
MSR_IA32_EXT_APIC_TMR0,
MSR_IA32_EXT_APIC_TMR1,
MSR_IA32_EXT_APIC_TMR2,
MSR_IA32_EXT_APIC_TMR3,
MSR_IA32_EXT_APIC_TMR4,
MSR_IA32_EXT_APIC_TMR5,
MSR_IA32_EXT_APIC_TMR6,
MSR_IA32_EXT_APIC_TMR7,
MSR_IA32_EXT_APIC_IRR0,
MSR_IA32_EXT_APIC_IRR1,
MSR_IA32_EXT_APIC_IRR2,
MSR_IA32_EXT_APIC_IRR3,
MSR_IA32_EXT_APIC_IRR4,
MSR_IA32_EXT_APIC_IRR5,
MSR_IA32_EXT_APIC_IRR6,
MSR_IA32_EXT_APIC_IRR7,
MSR_IA32_EXT_APIC_ESR,
MSR_IA32_EXT_APIC_LVT_CMCI,
MSR_IA32_EXT_APIC_ICR,
MSR_IA32_EXT_APIC_LVT_TIMER,
MSR_IA32_EXT_APIC_LVT_THERMAL,
MSR_IA32_EXT_APIC_LVT_PMI,
MSR_IA32_EXT_APIC_LVT_LINT0,
MSR_IA32_EXT_APIC_LVT_LINT1,
MSR_IA32_EXT_APIC_LVT_ERROR,
MSR_IA32_EXT_APIC_INIT_COUNT,
MSR_IA32_EXT_APIC_CUR_COUNT,
MSR_IA32_EXT_APIC_DIV_CONF,
MSR_IA32_EXT_APIC_SELF_IPI,
};
/* emulated_guest_msrs[] shares same indexes with array vcpu->arch->guest_msrs[] */
uint32_t vmsr_get_guest_msr_index(uint32_t msr)
{
uint32_t index;
for (index = 0U; index < NUM_GUEST_MSRS; index++) {
if (emulated_guest_msrs[index] == msr) {
break;
}
}
if (index == NUM_GUEST_MSRS) {
pr_err("%s, MSR %x is not defined in array emulated_guest_msrs[]", __func__, msr);
}
return index;
}
static void enable_msr_interception(uint8_t *bitmap, uint32_t msr_arg, uint32_t mode)
{
uint8_t *read_map;
uint8_t *write_map;
uint32_t msr = msr_arg;
uint8_t msr_bit;
uint32_t msr_index;
/* low MSR */
if (msr < 0x1FFFU) {
read_map = bitmap;
write_map = bitmap + 2048;
} else if ((msr >= 0xc0000000U) && (msr <= 0xc0001fffU)) {
read_map = bitmap + 1024;
write_map = bitmap + 3072;
} else {
pr_err("Invalid MSR");
return;
}
msr &= 0x1FFFU;
msr_bit = 1U << (msr & 0x7U);
msr_index = msr >> 3U;
if ((mode & INTERCEPT_READ) == INTERCEPT_READ) {
read_map[msr_index] |= msr_bit;
} else {
read_map[msr_index] &= ~msr_bit;
}
if ((mode & INTERCEPT_WRITE) == INTERCEPT_WRITE) {
write_map[msr_index] |= msr_bit;
} else {
write_map[msr_index] &= ~msr_bit;
}
}
/*
* Enable read and write msr interception for x2APIC MSRs
* MSRs that are not supported in the x2APIC range of MSRs,
* i.e. anything other than the ones below and between
* 0x802 and 0x83F, are not intercepted
*/
static void intercept_x2apic_msrs(uint8_t *msr_bitmap_arg, uint32_t mode)
{
uint8_t *msr_bitmap = msr_bitmap_arg;
uint32_t i;
for (i = 0U; i < NUM_X2APIC_MSRS; i++) {
enable_msr_interception(msr_bitmap, x2apic_msrs[i], mode);
}
}
static void init_msr_area(struct acrn_vcpu *vcpu)
{
vcpu->arch.msr_area.guest[MSR_AREA_TSC_AUX].msr_num = MSR_IA32_TSC_AUX;
vcpu->arch.msr_area.guest[MSR_AREA_TSC_AUX].value = vcpu->vcpu_id;
vcpu->arch.msr_area.host[MSR_AREA_TSC_AUX].msr_num = MSR_IA32_TSC_AUX;
vcpu->arch.msr_area.host[MSR_AREA_TSC_AUX].value = vcpu->pcpu_id;
}
void init_msr_emulation(struct acrn_vcpu *vcpu)
{
uint32_t msr, i;
uint8_t *msr_bitmap;
uint64_t value64;
if (is_vcpu_bsp(vcpu)) {
msr_bitmap = vcpu->vm->arch_vm.msr_bitmap;
for (i = 0U; i < NUM_GUEST_MSRS; i++) {
enable_msr_interception(msr_bitmap, emulated_guest_msrs[i], INTERCEPT_READ_WRITE);
}
for (i = 0U; i < NUM_MTRR_MSRS; i++) {
enable_msr_interception(msr_bitmap, mtrr_msrs[i], INTERCEPT_READ_WRITE);
}
intercept_x2apic_msrs(msr_bitmap, INTERCEPT_READ_WRITE);
for (i = 0U; i < NUM_UNSUPPORTED_MSRS; i++) {
enable_msr_interception(msr_bitmap, unsupported_msrs[i], INTERCEPT_READ_WRITE);
}
/* RDT-A disabled: CPUID.07H.EBX[12], CPUID.10H */
for (msr = MSR_IA32_L3_MASK_0; msr < MSR_IA32_BNDCFGS; msr++) {
enable_msr_interception(msr_bitmap, msr, INTERCEPT_READ_WRITE);
}
/* don't need to intercept rdmsr for these MSRs */
enable_msr_interception(msr_bitmap, MSR_IA32_TIME_STAMP_COUNTER, INTERCEPT_WRITE);
}
/* Setup MSR bitmap - Intel SDM Vol3 24.6.9 */
value64 = hva2hpa(vcpu->vm->arch_vm.msr_bitmap);
exec_vmwrite64(VMX_MSR_BITMAP_FULL, value64);
pr_dbg("VMX_MSR_BITMAP: 0x%016llx ", value64);
/* Initialize the MSR save/store area */
init_msr_area(vcpu);
}
int32_t rdmsr_vmexit_handler(struct acrn_vcpu *vcpu)
{
int32_t err = 0;
uint32_t msr;
uint64_t v = 0UL;
/* Read the msr value */
msr = (uint32_t)vcpu_get_gpreg(vcpu, CPU_REG_RCX);
/* Do the required processing for each msr case */
switch (msr) {
case MSR_IA32_TSC_DEADLINE:
{
err = vlapic_rdmsr(vcpu, msr, &v);
break;
}
case MSR_IA32_TSC_ADJUST:
{
v = vcpu_get_guest_msr(vcpu, MSR_IA32_TSC_ADJUST);
break;
}
case MSR_IA32_MTRR_CAP:
case MSR_IA32_MTRR_DEF_TYPE:
case MSR_IA32_MTRR_FIX64K_00000:
case MSR_IA32_MTRR_FIX16K_80000:
case MSR_IA32_MTRR_FIX16K_A0000:
case MSR_IA32_MTRR_FIX4K_C0000:
case MSR_IA32_MTRR_FIX4K_C8000:
case MSR_IA32_MTRR_FIX4K_D0000:
case MSR_IA32_MTRR_FIX4K_D8000:
case MSR_IA32_MTRR_FIX4K_E0000:
case MSR_IA32_MTRR_FIX4K_E8000:
case MSR_IA32_MTRR_FIX4K_F0000:
case MSR_IA32_MTRR_FIX4K_F8000:
{
#ifdef CONFIG_MTRR_ENABLED
v = read_vmtrr(vcpu, msr);
#else
err = -EACCES;
#endif
break;
}
case MSR_IA32_BIOS_SIGN_ID:
{
v = get_microcode_version();
break;
}
case MSR_IA32_PERF_CTL:
{
v = msr_read(msr);
break;
}
case MSR_IA32_PAT:
{
v = vmx_rdmsr_pat(vcpu);
break;
}
case MSR_IA32_APIC_BASE:
{
/* Read APIC base */
err = vlapic_rdmsr(vcpu, msr, &v);
break;
}
default:
{
if (is_x2apic_msr(msr)) {
err = vlapic_rdmsr(vcpu, msr, &v);
} else {
pr_warn("%s(): vm%d vcpu%d reading MSR %lx not supported",
__func__, vcpu->vm->vm_id, vcpu->vcpu_id, msr);
err = -EACCES;
v = 0UL;
}
break;
}
}
/* Store the MSR contents in RAX and RDX */
vcpu_set_gpreg(vcpu, CPU_REG_RAX, v & 0xffffffffU);
vcpu_set_gpreg(vcpu, CPU_REG_RDX, v >> 32U);
TRACE_2L(TRACE_VMEXIT_RDMSR, msr, v);
return err;
}
/*
* Intel SDM 17.17.3: If an execution of WRMSR to the
* IA32_TIME_STAMP_COUNTER MSR adds (or subtracts) value X from the
* TSC, the logical processor also adds (or subtracts) value X from
* the IA32_TSC_ADJUST MSR.
*/
static void set_guest_tsc(struct acrn_vcpu *vcpu, uint64_t guest_tsc)
{
uint64_t tsc_delta, tsc_offset_delta, tsc_adjust;
tsc_delta = guest_tsc - rdtsc();
/* the delta between new and existing TSC_OFFSET */
tsc_offset_delta = tsc_delta - exec_vmread64(VMX_TSC_OFFSET_FULL);
/* apply this delta to TSC_ADJUST */
tsc_adjust = vcpu_get_guest_msr(vcpu, MSR_IA32_TSC_ADJUST);
vcpu_set_guest_msr(vcpu, MSR_IA32_TSC_ADJUST, tsc_adjust + tsc_offset_delta);
/* write to VMCS because rdtsc and rdtscp are not intercepted */
exec_vmwrite64(VMX_TSC_OFFSET_FULL, tsc_delta);
}
/*
* Intel SDM 17.17.3: "If an execution of WRMSR to the IA32_TSC_ADJUST
* MSR adds (or subtracts) value X from that MSR, the logical
* processor also adds (or subtracts) value X from the TSC."
*/
static void set_guest_tsc_adjust(struct acrn_vcpu *vcpu, uint64_t tsc_adjust)
{
uint64_t tsc_offset, tsc_adjust_delta;
/* delta of the new and existing IA32_TSC_ADJUST */
tsc_adjust_delta = tsc_adjust - vcpu_get_guest_msr(vcpu, MSR_IA32_TSC_ADJUST);
/* apply this delta to existing TSC_OFFSET */
tsc_offset = exec_vmread64(VMX_TSC_OFFSET_FULL);
exec_vmwrite64(VMX_TSC_OFFSET_FULL, tsc_offset + tsc_adjust_delta);
/* IA32_TSC_ADJUST is supposed to carry the value it's written to */
vcpu_set_guest_msr(vcpu, MSR_IA32_TSC_ADJUST, tsc_adjust);
}
int32_t wrmsr_vmexit_handler(struct acrn_vcpu *vcpu)
{
int32_t err = 0;
uint32_t msr;
uint64_t v;
/* Read the MSR ID */
msr = (uint32_t)vcpu_get_gpreg(vcpu, CPU_REG_RCX);
/* Get the MSR contents */
v = (vcpu_get_gpreg(vcpu, CPU_REG_RDX) << 32U) |
vcpu_get_gpreg(vcpu, CPU_REG_RAX);
/* Do the required processing for each msr case */
switch (msr) {
case MSR_IA32_TSC_DEADLINE:
{
err = vlapic_wrmsr(vcpu, msr, v);
break;
}
case MSR_IA32_TSC_ADJUST:
{
set_guest_tsc_adjust(vcpu, v);
break;
}
case MSR_IA32_TIME_STAMP_COUNTER:
{
set_guest_tsc(vcpu, v);
break;
}
case MSR_IA32_MTRR_DEF_TYPE:
case MSR_IA32_MTRR_FIX64K_00000:
case MSR_IA32_MTRR_FIX16K_80000:
case MSR_IA32_MTRR_FIX16K_A0000:
case MSR_IA32_MTRR_FIX4K_C0000:
case MSR_IA32_MTRR_FIX4K_C8000:
case MSR_IA32_MTRR_FIX4K_D0000:
case MSR_IA32_MTRR_FIX4K_D8000:
case MSR_IA32_MTRR_FIX4K_E0000:
case MSR_IA32_MTRR_FIX4K_E8000:
case MSR_IA32_MTRR_FIX4K_F0000:
case MSR_IA32_MTRR_FIX4K_F8000:
{
#ifdef CONFIG_MTRR_ENABLED
write_vmtrr(vcpu, msr, v);
#else
err = -EACCES;
#endif
break;
}
case MSR_IA32_BIOS_SIGN_ID:
{
break;
}
case MSR_IA32_BIOS_UPDT_TRIG:
{
/* We only allow SOS to do uCode update */
if (is_vm0(vcpu->vm)) {
acrn_update_ucode(vcpu, v);
}
break;
}
case MSR_IA32_PERF_CTL:
{
if (validate_pstate(vcpu->vm, v) != 0) {
break;
}
msr_write(msr, v);
break;
}
case MSR_IA32_PAT:
{
err = vmx_wrmsr_pat(vcpu, v);
break;
}
case MSR_IA32_APIC_BASE:
{
err = vlapic_wrmsr(vcpu, msr, v);
break;
}
default:
{
if (is_x2apic_msr(msr)) {
err = vlapic_wrmsr(vcpu, msr, v);
} else {
pr_warn("%s(): vm%d vcpu%d writing MSR %lx not supported",
__func__, vcpu->vm->vm_id, vcpu->vcpu_id, msr);
err = -EACCES;
}
break;
}
}
TRACE_2L(TRACE_VMEXIT_WRMSR, msr, v);
return err;
}
void update_msr_bitmap_x2apic_apicv(struct acrn_vcpu *vcpu)
{
uint8_t *msr_bitmap;
msr_bitmap = vcpu->vm->arch_vm.msr_bitmap;
/*
* For platforms that do not support register virtualization
* all x2APIC MSRs need to intercepted. So no need to update
* the MSR bitmap.
*
* TPR is virtualized even when register virtualization is not
* supported
*/
if (is_apicv_reg_virtualization_supported()) {
intercept_x2apic_msrs(msr_bitmap, INTERCEPT_WRITE);
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_CUR_COUNT, INTERCEPT_READ);
/*
* Open read-only interception for write-only
* registers to inject gp on reads. EOI and Self-IPI
* Writes are disabled for EOI, TPR and Self-IPI as
* writes to them are virtualized with Register Virtualization
* Refer to Section 29.1 in Intel SDM Vol. 3
*/
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_TPR, INTERCEPT_DISABLE);
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_EOI, INTERCEPT_READ);
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_SELF_IPI, INTERCEPT_READ);
}
}
void update_msr_bitmap_x2apic_passthru(struct acrn_vcpu *vcpu)
{
uint32_t msr;
uint8_t *msr_bitmap;
msr_bitmap = vcpu->vm->arch_vm.msr_bitmap;
for (msr = MSR_IA32_EXT_XAPICID;
msr <= MSR_IA32_EXT_APIC_SELF_IPI; msr++) {
enable_msr_interception(msr_bitmap, msr, INTERCEPT_DISABLE);
}
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_ICR, INTERCEPT_WRITE);
enable_msr_interception(msr_bitmap, MSR_IA32_TSC_DEADLINE, INTERCEPT_DISABLE);
}
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