[PATCH v4 02/10] ARM/ARM64: KVM: Add base for PSCI v0.2 emulation
Jungseok Lee
jays.lee at samsung.com
Fri Feb 7 18:42:09 EST 2014
On Friday, February 07, 2014 6:26 PM, Anup Patel wrote:
>On Fri, Feb 7, 2014 at 2:37 PM, Jungseok Lee <jays.lee at samsung.com> wrote:
>> On Friday, February 07, 2014 5:36 PM, Anup Patel wrote:
>>> On Fri, Feb 7, 2014 at 1:58 PM, Jungseok Lee <jays.lee at samsung.com> wrote:
>>> > On Thursday, February 06, 2014 8:32 PM, Anup Patel wrote:
>>> >> Currently, the in-kernel PSCI emulation provides PSCI v0.1
>>> >> interface to VCPUs. This patch extends current in-kernel PSCI
>>> >> emulation to provide PSCI v0.2 interface to
>>> VCPUs.
>>> >>
>>> >> By default, ARM/ARM64 KVM will always provide PSCI v0.1 interface
>>> >> for keeping the ABI backward- compatible.
>>> >>
>>> >> To select PSCI v0.2 interface for VCPUs, the user space (i.e. QEMU
>>> >> or
>>> >> KVMTOOL) will have to set KVM_ARM_VCPU_PSCI_0_2 feature when doing
>>> >> VCPU init using KVM_ARM_VCPU_INIT ioctl.
>>> >>
>>> >> Signed-off-by: Anup Patel <anup.patel at linaro.org>
>>> >> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
>>> >> ---
>>> >> arch/arm/include/asm/kvm_host.h | 2 +-
>>> >> arch/arm/include/asm/kvm_psci.h | 4 ++
>>> >> arch/arm/include/uapi/asm/kvm.h | 35 ++++++++++++++-
>>> >> arch/arm/kvm/arm.c | 1 +
>>> >> arch/arm/kvm/psci.c | 85 +++++++++++++++++++++++++++++++------
>>> >> arch/arm64/include/asm/kvm_host.h | 2 +-
>>> >> arch/arm64/include/asm/kvm_psci.h | 4 ++
>>> >> arch/arm64/include/uapi/asm/kvm.h | 35 ++++++++++++++-
>>> >> 8 files changed, 152 insertions(+), 16 deletions(-)
>>> >>
>>> >> diff --git a/arch/arm/include/asm/kvm_host.h
>>> >> b/arch/arm/include/asm/kvm_host.h index 09af149..193ceaf
>>> >> 100644
>>> >> --- a/arch/arm/include/asm/kvm_host.h
>>> >> +++ b/arch/arm/include/asm/kvm_host.h
>>> >> @@ -36,7 +36,7 @@
>>> >> #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 #define
>>> >> KVM_HAVE_ONE_REG
>>> >>
>>> >> -#define KVM_VCPU_MAX_FEATURES 1
>>> >> +#define KVM_VCPU_MAX_FEATURES 2
>>> >>
>>> >> #include <kvm/arm_vgic.h>
>>> >>
>>> >> diff --git a/arch/arm/include/asm/kvm_psci.h
>>> >> b/arch/arm/include/asm/kvm_psci.h index 9a83d98..4c0e3e1
>>> >> 100644
>>> >> --- a/arch/arm/include/asm/kvm_psci.h
>>> >> +++ b/arch/arm/include/asm/kvm_psci.h
>>> >> @@ -18,6 +18,10 @@
>>> >> #ifndef __ARM_KVM_PSCI_H__
>>> >> #define __ARM_KVM_PSCI_H__
>>> >>
>>> >> +#define KVM_ARM_PSCI_0_1 1
>>> >> +#define KVM_ARM_PSCI_0_2 2
>>> >> +
>>> >> +int kvm_psci_version(struct kvm_vcpu *vcpu);
>>> >> bool kvm_psci_call(struct kvm_vcpu *vcpu);
>>> >>
>>> >> #endif /* __ARM_KVM_PSCI_H__ */
>>> >> diff --git a/arch/arm/include/uapi/asm/kvm.h
>>> >> b/arch/arm/include/uapi/asm/kvm.h index ef0c878..9c922d9
>>> >> 100644
>>> >> --- a/arch/arm/include/uapi/asm/kvm.h
>>> >> +++ b/arch/arm/include/uapi/asm/kvm.h
>>> >> @@ -83,6 +83,7 @@ struct kvm_regs {
>>> >> #define KVM_VGIC_V2_CPU_SIZE 0x2000
>>> >>
>>> >> #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
>>> >> +#define KVM_ARM_VCPU_PSCI_0_2 1 /* CPU uses PSCI v0.2 */
>>> >>
>>> >> struct kvm_vcpu_init {
>>> >> __u32 target;
>>> >> @@ -192,7 +193,7 @@ struct kvm_arch_memory_slot {
>>> >> /* Highest supported SPI, from VGIC_NR_IRQS */
>>> >> #define KVM_ARM_IRQ_GIC_MAX 127
>>> >>
>>> >> -/* PSCI interface */
>>> >> +/* PSCI v0.1 interface */
>>> >> #define KVM_PSCI_FN_BASE 0x95c1ba5e
>>> >> #define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
>>> >>
>>> >> @@ -201,9 +202,41 @@ struct kvm_arch_memory_slot {
>>> >> #define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
>>> >> #define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
>>> >>
>>> >> +/* PSCI v0.2 interface */
>>> >> +#define KVM_PSCI_0_2_FN_BASE 0x84000000
>>> >> +#define KVM_PSCI_0_2_FN(n) (KVM_PSCI_0_2_FN_BASE + (n))
>>> >> +#define KVM_PSCI_0_2_FN64_BASE 0xC4000000
>>> >> +#define KVM_PSCI_0_2_FN64(n) (KVM_PSCI_0_2_FN64_BASE + (n))
>>> >> +
>>> >> +#define KVM_PSCI_0_2_FN_PSCI_VERSION KVM_PSCI_0_2_FN(0) #define
>>> >> +KVM_PSCI_0_2_FN_CPU_SUSPEND KVM_PSCI_0_2_FN(1)
>>> >> +#define KVM_PSCI_0_2_FN_CPU_OFF KVM_PSCI_0_2_FN(2)
>>> >> +#define KVM_PSCI_0_2_FN_CPU_ON KVM_PSCI_0_2_FN(3)
>>> >> +#define KVM_PSCI_0_2_FN_AFFINITY_INFO KVM_PSCI_0_2_FN(4)
>>> >> +#define KVM_PSCI_0_2_FN_MIGRATE KVM_PSCI_0_2_FN(5)
>>> >> +#define KVM_PSCI_0_2_FN_MIGRATE_INFO_TYPE \
>>> >> + KVM_PSCI_0_2_FN(6) #define
>>> >> +KVM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU \
>>> >> + KVM_PSCI_0_2_FN(7)
>>> >> +#define KVM_PSCI_0_2_FN_SYSTEM_OFF KVM_PSCI_0_2_FN(8)
>>> >> +#define KVM_PSCI_0_2_FN_SYSTEM_RESET KVM_PSCI_0_2_FN(9)
>>> >> +
>>> >> +#define KVM_PSCI_0_2_FN64_CPU_SUSPEND KVM_PSCI_0_2_FN64(1)
>>> >> +#define KVM_PSCI_0_2_FN64_CPU_ON KVM_PSCI_0_2_FN64(3)
>>> >> +#define KVM_PSCI_0_2_FN64_AFFINITY_INFO KVM_PSCI_0_2_FN64(4)
>>> >> +#define KVM_PSCI_0_2_FN64_MIGRATE KVM_PSCI_0_2_FN64(5)
>>> >> +#define KVM_PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU \
>>> >> + KVM_PSCI_0_2_FN64(7)
>>> >> +
>>> >
>>> > Hi
>>> >
>>> > This patch describes PSCI v0.2 specification well. Instead, I have
>>> > a question on interface types, not implementation.
>>> >
>>> > According to PSCI v0.2 document, it does not cover DVFS.
>>> > Could I get an idea why DVFS is not supported?
>>>
>>> PSCI v0.2 only describes few mandatory functions required for being
>>> PSCI v0.2 compliant. For rest of the stuff such as DVFS you will need to define your own platform
>specific PSCI function.
>>> (Marc/Mark correct me if I am wrong here?)
>>
>> It seems that I should change architecture codes if I need other interfaces.
>> Under this implementation, I should add my own interface to generic
>> codes, such as, arch/arm/include/asm/kvm_psci.h. However, I think that
>> it is not acceptable to upstream. If so, is there any place to define
>> a platform specific PSCI functions?
>
>Are you trying to emulate your platform specific DVFS PSCI function for a VM using KVM ARM/ARM64??
[Sorry for noise to mailing-list as violating mailing rule]
No, I am not.
My original intention is to clarify the interface between KVM and VM if
DVFS scheme is applied to VM. Currently, PSCI v0.2 does not define it.
Thus, I wonder why this interface is not covered.
>If so then arch/arm/kvm/psci.c is not the place for it. All platform specific PSCI function are to be
>emulated from user space. KVM
>ARM/ARM64 will only emulate HVC-based mandatory PSCI v0.2 functions.
Okay, clear.
Regards
Jungseok Lee
>User space emulation of platform specific PSCI functions are still a TODO item for KVM ARM/ARM64. It
>will require a mechanism in KVM ARM/ARM64 to route SMC-based PSCI function calls to user space (i.e.
>QEMU or KVMTOOL).
>
>Regards,
>Anup
>
>>
>> Best Regards
>> Jungseok Lee
>>
>>> Mab be in future some PSCI vX.Y will define standardized PSCI function for DVFS too.
>>>
>>> Regards,
>>> Anup
>>>
>>> >
>>> > Best Regards
>>> > Jungseok Lee
>>> >
>>> >> +/* PSCI return values */
>>> >> #define KVM_PSCI_RET_SUCCESS 0
>>> >> #define KVM_PSCI_RET_NI ((unsigned long)-1)
>>> >> #define KVM_PSCI_RET_INVAL ((unsigned long)-2)
>>> >> #define KVM_PSCI_RET_DENIED ((unsigned long)-3)
>>> >> +#define KVM_PSCI_RET_ALREADY_ON ((unsigned long)-4)
>>> >> +#define KVM_PSCI_RET_ON_PENDING ((unsigned long)-5)
>>> >> +#define KVM_PSCI_RET_INTERNAL_FAILURE ((unsigned long)-6)
>>> >> +#define KVM_PSCI_RET_NOT_PRESENT ((unsigned long)-7)
>>> >> +#define KVM_PSCI_RET_DISABLED ((unsigned long)-8)
>>> >>
>>> >> #endif /* __ARM_KVM_H__ */
>>> >> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index
>>> >> 1d8248e..c8a71df 100644
>>> >> --- a/arch/arm/kvm/arm.c
>>> >> +++ b/arch/arm/kvm/arm.c
>>> >> @@ -197,6 +197,7 @@ int kvm_dev_ioctl_check_extension(long ext)
>>> >> case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
>>> >> case KVM_CAP_ONE_REG:
>>> >> case KVM_CAP_ARM_PSCI:
>>> >> + case KVM_CAP_ARM_PSCI_0_2:
>>> >> r = 1;
>>> >> break;
>>> >> case KVM_CAP_COALESCED_MMIO:
>>> >> diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c index
>>> >> 448f60e..e4ec4af 100644
>>> >> --- a/arch/arm/kvm/psci.c
>>> >> +++ b/arch/arm/kvm/psci.c
>>> >> @@ -85,17 +85,57 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
>>> >> return KVM_PSCI_RET_SUCCESS; }
>>> >>
>>> >> -/**
>>> >> - * kvm_psci_call - handle PSCI call if r0 value is in range
>>> >> - * @vcpu: Pointer to the VCPU struct
>>> >> - *
>>> >> - * Handle PSCI calls from guests through traps from HVC instructions.
>>> >> - * The calling convention is similar to SMC calls to the secure
>>> >> world where
>>> >> - * the function number is placed in r0 and this function returns
>>> >> true if the
>>> >> - * function number specified in r0 is withing the PSCI range, and
>>> >> false
>>> >> - * otherwise.
>>> >> - */
>>> >> -bool kvm_psci_call(struct kvm_vcpu *vcpu)
>>> >> +int kvm_psci_version(struct kvm_vcpu *vcpu) {
>>> >> + if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
>>> >> + return KVM_ARM_PSCI_0_2;
>>> >> +
>>> >> + return KVM_ARM_PSCI_0_1;
>>> >> +}
>>> >> +
>>> >> +static bool kvm_psci_0_2_call(struct kvm_vcpu *vcpu) {
>>> >> + unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
>>> >> + unsigned long val;
>>> >> +
>>> >> + switch (psci_fn) {
>>> >> + case KVM_PSCI_0_2_FN_PSCI_VERSION:
>>> >> + /*
>>> >> + * Bits[31:16] = Major Version = 0
>>> >> + * Bits[15:0] = Minor Version = 2
>>> >> + */
>>> >> + val = 2;
>>> >> + break;
>>> >> + case KVM_PSCI_0_2_FN_CPU_OFF:
>>> >> + kvm_psci_vcpu_off(vcpu);
>>> >> + val = KVM_PSCI_RET_SUCCESS;
>>> >> + break;
>>> >> + case KVM_PSCI_0_2_FN_CPU_ON:
>>> >> + case KVM_PSCI_0_2_FN64_CPU_ON:
>>> >> + val = kvm_psci_vcpu_on(vcpu);
>>> >> + break;
>>> >> + case KVM_PSCI_0_2_FN_CPU_SUSPEND:
>>> >> + case KVM_PSCI_0_2_FN_AFFINITY_INFO:
>>> >> + case KVM_PSCI_0_2_FN_MIGRATE:
>>> >> + case KVM_PSCI_0_2_FN_MIGRATE_INFO_TYPE:
>>> >> + case KVM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
>>> >> + case KVM_PSCI_0_2_FN_SYSTEM_OFF:
>>> >> + case KVM_PSCI_0_2_FN_SYSTEM_RESET:
>>> >> + case KVM_PSCI_0_2_FN64_CPU_SUSPEND:
>>> >> + case KVM_PSCI_0_2_FN64_AFFINITY_INFO:
>>> >> + case KVM_PSCI_0_2_FN64_MIGRATE:
>>> >> + case KVM_PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
>>> >> + val = KVM_PSCI_RET_NI;
>>> >> + break;
>>> >> + default:
>>> >> + return false;
>>> >> + }
>>> >> +
>>> >> + *vcpu_reg(vcpu, 0) = val;
>>> >> + return true;
>>> >> +}
>>> >> +
>>> >> +static bool kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
>>> >> {
>>> >> unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
>>> >> unsigned long val;
>>> >> @@ -112,7 +152,6 @@ bool kvm_psci_call(struct kvm_vcpu *vcpu)
>>> >> case KVM_PSCI_FN_MIGRATE:
>>> >> val = KVM_PSCI_RET_NI;
>>> >> break;
>>> >> -
>>> >> default:
>>> >> return false;
>>> >> }
>>> >> @@ -120,3 +159,25 @@ bool kvm_psci_call(struct kvm_vcpu *vcpu)
>>> >> *vcpu_reg(vcpu, 0) = val;
>>> >> return true;
>>> >> }
>>> >> +
>>> >> +/**
>>> >> + * kvm_psci_call - handle PSCI call if r0 value is in range
>>> >> + * @vcpu: Pointer to the VCPU struct
>>> >> + *
>>> >> + * Handle PSCI calls from guests through traps from HVC instructions.
>>> >> + * The calling convention is similar to SMC calls to the secure
>>> >> +world where
>>> >> + * the function number is placed in r0 and this function returns
>>> >> +true if the
>>> >> + * function number specified in r0 is withing the PSCI range, and
>>> >> +false
>>> >> + * otherwise.
>>> >> + */
>>> >> +bool kvm_psci_call(struct kvm_vcpu *vcpu) {
>>> >> + switch (kvm_psci_version(vcpu)) {
>>> >> + case KVM_ARM_PSCI_0_2:
>>> >> + return kvm_psci_0_2_call(vcpu);
>>> >> + case KVM_ARM_PSCI_0_1:
>>> >> + return kvm_psci_0_1_call(vcpu);
>>> >> + default:
>>> >> + return false;
>>> >> + };
>>> >> +}
>>> >> diff --git a/arch/arm64/include/asm/kvm_host.h
>>> >> b/arch/arm64/include/asm/kvm_host.h
>>> >> index 0a1d697..92242ce 100644
>>> >> --- a/arch/arm64/include/asm/kvm_host.h
>>> >> +++ b/arch/arm64/include/asm/kvm_host.h
>>> >> @@ -39,7 +39,7 @@
>>> >> #include <kvm/arm_vgic.h>
>>> >> #include <kvm/arm_arch_timer.h>
>>> >>
>>> >> -#define KVM_VCPU_MAX_FEATURES 2
>>> >> +#define KVM_VCPU_MAX_FEATURES 3
>>> >>
>>> >> struct kvm_vcpu;
>>> >> int kvm_target_cpu(void);
>>> >> diff --git a/arch/arm64/include/asm/kvm_psci.h
>>> >> b/arch/arm64/include/asm/kvm_psci.h
>>> >> index e301a48..e25c658 100644
>>> >> --- a/arch/arm64/include/asm/kvm_psci.h
>>> >> +++ b/arch/arm64/include/asm/kvm_psci.h
>>> >> @@ -18,6 +18,10 @@
>>> >> #ifndef __ARM64_KVM_PSCI_H__
>>> >> #define __ARM64_KVM_PSCI_H__
>>> >>
>>> >> +#define KVM_ARM_PSCI_0_1 1
>>> >> +#define KVM_ARM_PSCI_0_2 2
>>> >> +
>>> >> +int kvm_psci_version(struct kvm_vcpu *vcpu);
>>> >> bool kvm_psci_call(struct kvm_vcpu *vcpu);
>>> >>
>>> >> #endif /* __ARM64_KVM_PSCI_H__ */ diff --git
>>> >> a/arch/arm64/include/uapi/asm/kvm.h
>>> >> b/arch/arm64/include/uapi/asm/kvm.h
>>> >> index eaf54a3..cadc318 100644
>>> >> --- a/arch/arm64/include/uapi/asm/kvm.h
>>> >> +++ b/arch/arm64/include/uapi/asm/kvm.h
>>> >> @@ -77,6 +77,7 @@ struct kvm_regs {
>>> >>
>>> >> #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
>>> >> #define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */
>>> >> +#define KVM_ARM_VCPU_PSCI_0_2 2 /* CPU uses PSCI v0.2 */
>>> >>
>>> >> struct kvm_vcpu_init {
>>> >> __u32 target;
>>> >> @@ -177,7 +178,7 @@ struct kvm_arch_memory_slot {
>>> >> /* Highest supported SPI, from VGIC_NR_IRQS */
>>> >> #define KVM_ARM_IRQ_GIC_MAX 127
>>> >>
>>> >> -/* PSCI interface */
>>> >> +/* PSCI v0.1 interface */
>>> >> #define KVM_PSCI_FN_BASE 0x95c1ba5e
>>> >> #define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
>>> >>
>>> >> @@ -186,10 +187,42 @@ struct kvm_arch_memory_slot {
>>> >> #define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
>>> >> #define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
>>> >>
>>> >> +/* PSCI v0.2 interface */
>>> >> +#define KVM_PSCI_0_2_FN_BASE 0x84000000
>>> >> +#define KVM_PSCI_0_2_FN(n) (KVM_PSCI_0_2_FN_BASE + (n))
>>> >> +#define KVM_PSCI_0_2_FN64_BASE 0xC4000000
>>> >> +#define KVM_PSCI_0_2_FN64(n) (KVM_PSCI_0_2_FN64_BASE + (n))
>>> >> +
>>> >> +#define KVM_PSCI_0_2_FN_PSCI_VERSION KVM_PSCI_0_2_FN(0) #define
>>> >> +KVM_PSCI_0_2_FN_CPU_SUSPEND KVM_PSCI_0_2_FN(1)
>>> >> +#define KVM_PSCI_0_2_FN_CPU_OFF KVM_PSCI_0_2_FN(2)
>>> >> +#define KVM_PSCI_0_2_FN_CPU_ON KVM_PSCI_0_2_FN(3)
>>> >> +#define KVM_PSCI_0_2_FN_AFFINITY_INFO KVM_PSCI_0_2_FN(4)
>>> >> +#define KVM_PSCI_0_2_FN_MIGRATE KVM_PSCI_0_2_FN(5)
>>> >> +#define KVM_PSCI_0_2_FN_MIGRATE_INFO_TYPE \
>>> >> + KVM_PSCI_0_2_FN(6) #define
>>> >> +KVM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU \
>>> >> + KVM_PSCI_0_2_FN(7)
>>> >> +#define KVM_PSCI_0_2_FN_SYSTEM_OFF KVM_PSCI_0_2_FN(8)
>>> >> +#define KVM_PSCI_0_2_FN_SYSTEM_RESET KVM_PSCI_0_2_FN(9)
>>> >> +
>>> >> +#define KVM_PSCI_0_2_FN64_CPU_SUSPEND KVM_PSCI_0_2_FN64(1)
>>> >> +#define KVM_PSCI_0_2_FN64_CPU_ON KVM_PSCI_0_2_FN64(3)
>>> >> +#define KVM_PSCI_0_2_FN64_AFFINITY_INFO KVM_PSCI_0_2_FN64(4)
>>> >> +#define KVM_PSCI_0_2_FN64_MIGRATE KVM_PSCI_0_2_FN64(5)
>>> >> +#define KVM_PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU \
>>> >> + KVM_PSCI_0_2_FN64(7)
>>> >> +
>>> >> +/* PSCI return values */
>>> >> #define KVM_PSCI_RET_SUCCESS 0
>>> >> #define KVM_PSCI_RET_NI ((unsigned long)-1)
>>> >> #define KVM_PSCI_RET_INVAL ((unsigned long)-2)
>>> >> #define KVM_PSCI_RET_DENIED ((unsigned long)-3)
>>> >> +#define KVM_PSCI_RET_ALREADY_ON ((unsigned long)-4)
>>> >> +#define KVM_PSCI_RET_ON_PENDING ((unsigned long)-5)
>>> >> +#define KVM_PSCI_RET_INTERNAL_FAILURE ((unsigned long)-6)
>>> >> +#define KVM_PSCI_RET_NOT_PRESENT ((unsigned long)-7)
>>> >> +#define KVM_PSCI_RET_DISABLED ((unsigned long)-8)
>>> >>
>>> >> #endif
>>> >>
>>> >> --
>>> >> 1.7.9.5
>>> >>
>>> >> _______________________________________________
>>> >> kvmarm mailing list
>>> >> kvmarm at lists.cs.columbia.edu
>>> >> https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
>>> >
>>> > _______________________________________________
>>> > kvmarm mailing list
>>> > kvmarm at lists.cs.columbia.edu
>>> > https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
>>
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