diff mbox series

[9/9] arm64: Retrieve stolen time as paravirtualized guest

Message ID 20190802145017.42543-10-steven.price@arm.com
State New, archived
Headers show
Series arm64: Stolen time support | expand

Commit Message

Steven Price Aug. 2, 2019, 2:50 p.m. UTC
Enable paravirtualization features when running under a hypervisor
supporting the PV_TIME_ST hypercall.

For each (v)CPU, we ask the hypervisor for the location of a shared
page which the hypervisor will use to report stolen time to us. We set
pv_time_ops to the stolen time function which simply reads the stolen
value from the shared page for a VCPU. We guarantee single-copy
atomicity using READ_ONCE which means we can also read the stolen
time for another VCPU than the currently running one while it is
potentially being updated by the hypervisor.

Signed-off-by: Steven Price <steven.price@arm.com>
---
 arch/arm64/kernel/Makefile |   1 +
 arch/arm64/kernel/kvm.c    | 155 +++++++++++++++++++++++++++++++++++++
 include/linux/cpuhotplug.h |   1 +
 3 files changed, 157 insertions(+)
 create mode 100644 arch/arm64/kernel/kvm.c

Comments

Marc Zyngier Aug. 4, 2019, 9:53 a.m. UTC | #1
On Fri,  2 Aug 2019 15:50:17 +0100
Steven Price <steven.price@arm.com> wrote:

> Enable paravirtualization features when running under a hypervisor
> supporting the PV_TIME_ST hypercall.
> 
> For each (v)CPU, we ask the hypervisor for the location of a shared
> page which the hypervisor will use to report stolen time to us. We set
> pv_time_ops to the stolen time function which simply reads the stolen
> value from the shared page for a VCPU. We guarantee single-copy
> atomicity using READ_ONCE which means we can also read the stolen
> time for another VCPU than the currently running one while it is
> potentially being updated by the hypervisor.
> 
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  arch/arm64/kernel/Makefile |   1 +
>  arch/arm64/kernel/kvm.c    | 155 +++++++++++++++++++++++++++++++++++++

nit: Why not using paravirt.c, which clearly states what it does? The
alternative would be to name it kvm-pv.c.

>  include/linux/cpuhotplug.h |   1 +
>  3 files changed, 157 insertions(+)
>  create mode 100644 arch/arm64/kernel/kvm.c
> 
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index 478491f07b4f..eb36edf9b930 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_CRASH_CORE)		+= crash_core.o
>  obj-$(CONFIG_ARM_SDE_INTERFACE)		+= sdei.o
>  obj-$(CONFIG_ARM64_SSBD)		+= ssbd.o
>  obj-$(CONFIG_ARM64_PTR_AUTH)		+= pointer_auth.o
> +obj-$(CONFIG_PARAVIRT)			+= kvm.o
>  
>  obj-y					+= vdso/ probes/
>  obj-$(CONFIG_COMPAT_VDSO)		+= vdso32/
> diff --git a/arch/arm64/kernel/kvm.c b/arch/arm64/kernel/kvm.c
> new file mode 100644
> index 000000000000..245398c79dae
> --- /dev/null
> +++ b/arch/arm64/kernel/kvm.c
> @@ -0,0 +1,155 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2019 Arm Ltd.
> +
> +#define pr_fmt(fmt) "kvmarm-pv: " fmt
> +
> +#include <linux/arm-smccc.h>
> +#include <linux/cpuhotplug.h>
> +#include <linux/io.h>
> +#include <linux/printk.h>
> +#include <linux/psci.h>
> +#include <linux/reboot.h>
> +#include <linux/slab.h>
> +
> +#include <asm/paravirt.h>
> +#include <asm/pvclock-abi.h>
> +#include <asm/smp_plat.h>
> +
> +struct kvmarm_stolen_time_region {
> +	struct pvclock_vcpu_stolen_time_info *kaddr;
> +};
> +
> +static DEFINE_PER_CPU(struct kvmarm_stolen_time_region, stolen_time_region);
> +
> +static bool steal_acc = true;
> +static int __init parse_no_stealacc(char *arg)
> +{
> +	steal_acc = false;
> +	return 0;
> +}
> +early_param("no-steal-acc", parse_no_stealacc);
> +
> +/* return stolen time in ns by asking the hypervisor */
> +static u64 kvm_steal_clock(int cpu)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +
> +	reg = per_cpu_ptr(&stolen_time_region, cpu);
> +	if (!reg->kaddr) {
> +		pr_warn_once("stolen time enabled but not configured for cpu %d\n",
> +			     cpu);
> +		return 0;
> +	}
> +
> +	return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
> +}
> +
> +static int disable_stolen_time_current_cpu(void)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +
> +	reg = this_cpu_ptr(&stolen_time_region);
> +	if (!reg->kaddr)
> +		return 0;
> +
> +	memunmap(reg->kaddr);
> +	memset(reg, 0, sizeof(*reg));
> +
> +	return 0;
> +}
> +
> +static int stolen_time_dying_cpu(unsigned int cpu)
> +{
> +	return disable_stolen_time_current_cpu();
> +}
> +
> +static int init_stolen_time_cpu(unsigned int cpu)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +	struct arm_smccc_res res;
> +
> +	reg = this_cpu_ptr(&stolen_time_region);
> +
> +	if (reg->kaddr)
> +		return 0;

Can this actually happen? It'd take two CPU_UP calls from the HP
notifiers to get in that situation...

> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_ST, &res);
> +
> +	if ((long)res.a0 < 0)
> +		return -EINVAL;
> +
> +	reg->kaddr = memremap(res.a0,
> +			sizeof(struct pvclock_vcpu_stolen_time_info),
> +			MEMREMAP_WB);
> +
> +	if (reg->kaddr == NULL) {
> +		pr_warn("Failed to map stolen time data structure\n");
> +		return -EINVAL;

-ENOMEM is the expected return code.

> +	}
> +
> +	if (le32_to_cpu(reg->kaddr->revision) != 0 ||
> +			le32_to_cpu(reg->kaddr->attributes) != 0) {
> +		pr_warn("Unexpected revision or attributes in stolen time data\n");
> +		return -ENXIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static int kvm_arm_init_stolen_time(void)
> +{
> +	int ret;
> +
> +	ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
> +				"hypervisor/kvmarm/pv:starting",
> +				init_stolen_time_cpu, stolen_time_dying_cpu);
> +	if (ret < 0)
> +		return ret;
> +	return 0;
> +}
> +
> +static bool has_kvm_steal_clock(void)
> +{
> +	struct arm_smccc_res res;
> +
> +	/* To detect the presence of PV time support we require SMCCC 1.1+ */
> +	if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
> +		return false;
> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
> +			     ARM_SMCCC_HV_PV_FEATURES, &res);
> +
> +	if (res.a0 != SMCCC_RET_SUCCESS)
> +		return false;
> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_FEATURES,
> +			     ARM_SMCCC_HV_PV_TIME_ST, &res);
> +
> +	if (res.a0 != SMCCC_RET_SUCCESS)
> +		return false;
> +
> +	return true;
> +}
> +
> +static int __init kvm_guest_init(void)
> +{
> +	int ret = 0;
> +
> +	if (!has_kvm_steal_clock())
> +		return 0;
> +
> +	ret = kvm_arm_init_stolen_time();
> +	if (ret)
> +		return ret;
> +
> +	pv_ops.time.steal_clock = kvm_steal_clock;
> +
> +	static_key_slow_inc(&paravirt_steal_enabled);
> +	if (steal_acc)
> +		static_key_slow_inc(&paravirt_steal_rq_enabled);
> +
> +	pr_info("using stolen time PV\n");
> +
> +	return 0;
> +}
> +early_initcall(kvm_guest_init);

Is there any reason why we wouldn't directly call into this rather than
using an initcall?

> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> index 068793a619ca..89d75edb5750 100644
> --- a/include/linux/cpuhotplug.h
> +++ b/include/linux/cpuhotplug.h
> @@ -136,6 +136,7 @@ enum cpuhp_state {
>  	/* Must be the last timer callback */
>  	CPUHP_AP_DUMMY_TIMER_STARTING,
>  	CPUHP_AP_ARM_XEN_STARTING,
> +	CPUHP_AP_ARM_KVMPV_STARTING,
>  	CPUHP_AP_ARM_CORESIGHT_STARTING,
>  	CPUHP_AP_ARM64_ISNDEP_STARTING,
>  	CPUHP_AP_SMPCFD_DYING,


Thanks,

	M.
Steven Price Aug. 8, 2019, 3:29 p.m. UTC | #2
On 04/08/2019 10:53, Marc Zyngier wrote:
> On Fri,  2 Aug 2019 15:50:17 +0100
> Steven Price <steven.price@arm.com> wrote:
> 
>> Enable paravirtualization features when running under a hypervisor
>> supporting the PV_TIME_ST hypercall.
>>
>> For each (v)CPU, we ask the hypervisor for the location of a shared
>> page which the hypervisor will use to report stolen time to us. We set
>> pv_time_ops to the stolen time function which simply reads the stolen
>> value from the shared page for a VCPU. We guarantee single-copy
>> atomicity using READ_ONCE which means we can also read the stolen
>> time for another VCPU than the currently running one while it is
>> potentially being updated by the hypervisor.
>>
>> Signed-off-by: Steven Price <steven.price@arm.com>
>> ---
>>  arch/arm64/kernel/Makefile |   1 +
>>  arch/arm64/kernel/kvm.c    | 155 +++++++++++++++++++++++++++++++++++++
> 
> nit: Why not using paravirt.c, which clearly states what it does? The
> alternative would be to name it kvm-pv.c.

I can move it to paravirt.c - seems reasonable.

>>  include/linux/cpuhotplug.h |   1 +
>>  3 files changed, 157 insertions(+)
>>  create mode 100644 arch/arm64/kernel/kvm.c
>>
>> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
>> index 478491f07b4f..eb36edf9b930 100644
>> --- a/arch/arm64/kernel/Makefile
>> +++ b/arch/arm64/kernel/Makefile
>> @@ -63,6 +63,7 @@ obj-$(CONFIG_CRASH_CORE)		+= crash_core.o
>>  obj-$(CONFIG_ARM_SDE_INTERFACE)		+= sdei.o
>>  obj-$(CONFIG_ARM64_SSBD)		+= ssbd.o
>>  obj-$(CONFIG_ARM64_PTR_AUTH)		+= pointer_auth.o
>> +obj-$(CONFIG_PARAVIRT)			+= kvm.o
>>  
>>  obj-y					+= vdso/ probes/
>>  obj-$(CONFIG_COMPAT_VDSO)		+= vdso32/
>> diff --git a/arch/arm64/kernel/kvm.c b/arch/arm64/kernel/kvm.c
>> new file mode 100644
>> index 000000000000..245398c79dae
>> --- /dev/null
>> +++ b/arch/arm64/kernel/kvm.c
>> @@ -0,0 +1,155 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// Copyright (C) 2019 Arm Ltd.
>> +
>> +#define pr_fmt(fmt) "kvmarm-pv: " fmt
>> +
>> +#include <linux/arm-smccc.h>
>> +#include <linux/cpuhotplug.h>
>> +#include <linux/io.h>
>> +#include <linux/printk.h>
>> +#include <linux/psci.h>
>> +#include <linux/reboot.h>
>> +#include <linux/slab.h>
>> +
>> +#include <asm/paravirt.h>
>> +#include <asm/pvclock-abi.h>
>> +#include <asm/smp_plat.h>
>> +
>> +struct kvmarm_stolen_time_region {
>> +	struct pvclock_vcpu_stolen_time_info *kaddr;
>> +};
>> +
>> +static DEFINE_PER_CPU(struct kvmarm_stolen_time_region, stolen_time_region);
>> +
>> +static bool steal_acc = true;
>> +static int __init parse_no_stealacc(char *arg)
>> +{
>> +	steal_acc = false;
>> +	return 0;
>> +}
>> +early_param("no-steal-acc", parse_no_stealacc);
>> +
>> +/* return stolen time in ns by asking the hypervisor */
>> +static u64 kvm_steal_clock(int cpu)
>> +{
>> +	struct kvmarm_stolen_time_region *reg;
>> +
>> +	reg = per_cpu_ptr(&stolen_time_region, cpu);
>> +	if (!reg->kaddr) {
>> +		pr_warn_once("stolen time enabled but not configured for cpu %d\n",
>> +			     cpu);
>> +		return 0;
>> +	}
>> +
>> +	return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
>> +}
>> +
>> +static int disable_stolen_time_current_cpu(void)
>> +{
>> +	struct kvmarm_stolen_time_region *reg;
>> +
>> +	reg = this_cpu_ptr(&stolen_time_region);
>> +	if (!reg->kaddr)
>> +		return 0;
>> +
>> +	memunmap(reg->kaddr);
>> +	memset(reg, 0, sizeof(*reg));
>> +
>> +	return 0;
>> +}
>> +
>> +static int stolen_time_dying_cpu(unsigned int cpu)
>> +{
>> +	return disable_stolen_time_current_cpu();
>> +}
>> +
>> +static int init_stolen_time_cpu(unsigned int cpu)
>> +{
>> +	struct kvmarm_stolen_time_region *reg;
>> +	struct arm_smccc_res res;
>> +
>> +	reg = this_cpu_ptr(&stolen_time_region);
>> +
>> +	if (reg->kaddr)
>> +		return 0;
> 
> Can this actually happen? It'd take two CPU_UP calls from the HP
> notifiers to get in that situation...

Yes, something would have to be very broken for that to happen - I'll
remove this check.

>> +
>> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_ST, &res);
>> +
>> +	if ((long)res.a0 < 0)
>> +		return -EINVAL;
>> +
>> +	reg->kaddr = memremap(res.a0,
>> +			sizeof(struct pvclock_vcpu_stolen_time_info),
>> +			MEMREMAP_WB);
>> +
>> +	if (reg->kaddr == NULL) {
>> +		pr_warn("Failed to map stolen time data structure\n");
>> +		return -EINVAL;
> 
> -ENOMEM is the expected return code.

Ok

>> +	}
>> +
>> +	if (le32_to_cpu(reg->kaddr->revision) != 0 ||
>> +			le32_to_cpu(reg->kaddr->attributes) != 0) {
>> +		pr_warn("Unexpected revision or attributes in stolen time data\n");
>> +		return -ENXIO;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int kvm_arm_init_stolen_time(void)
>> +{
>> +	int ret;
>> +
>> +	ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
>> +				"hypervisor/kvmarm/pv:starting",
>> +				init_stolen_time_cpu, stolen_time_dying_cpu);
>> +	if (ret < 0)
>> +		return ret;
>> +	return 0;
>> +}
>> +
>> +static bool has_kvm_steal_clock(void)
>> +{
>> +	struct arm_smccc_res res;
>> +
>> +	/* To detect the presence of PV time support we require SMCCC 1.1+ */
>> +	if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
>> +		return false;
>> +
>> +	arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
>> +			     ARM_SMCCC_HV_PV_FEATURES, &res);
>> +
>> +	if (res.a0 != SMCCC_RET_SUCCESS)
>> +		return false;
>> +
>> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_FEATURES,
>> +			     ARM_SMCCC_HV_PV_TIME_ST, &res);
>> +
>> +	if (res.a0 != SMCCC_RET_SUCCESS)
>> +		return false;
>> +
>> +	return true;
>> +}
>> +
>> +static int __init kvm_guest_init(void)
>> +{
>> +	int ret = 0;
>> +
>> +	if (!has_kvm_steal_clock())
>> +		return 0;
>> +
>> +	ret = kvm_arm_init_stolen_time();
>> +	if (ret)
>> +		return ret;
>> +
>> +	pv_ops.time.steal_clock = kvm_steal_clock;
>> +
>> +	static_key_slow_inc(&paravirt_steal_enabled);
>> +	if (steal_acc)
>> +		static_key_slow_inc(&paravirt_steal_rq_enabled);
>> +
>> +	pr_info("using stolen time PV\n");
>> +
>> +	return 0;
>> +}
>> +early_initcall(kvm_guest_init);
> 
> Is there any reason why we wouldn't directly call into this rather than
> using an initcall?

I'm not sure where the direct call would go - any pointers?

Thanks,

Steve

>> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
>> index 068793a619ca..89d75edb5750 100644
>> --- a/include/linux/cpuhotplug.h
>> +++ b/include/linux/cpuhotplug.h
>> @@ -136,6 +136,7 @@ enum cpuhp_state {
>>  	/* Must be the last timer callback */
>>  	CPUHP_AP_DUMMY_TIMER_STARTING,
>>  	CPUHP_AP_ARM_XEN_STARTING,
>> +	CPUHP_AP_ARM_KVMPV_STARTING,
>>  	CPUHP_AP_ARM_CORESIGHT_STARTING,
>>  	CPUHP_AP_ARM64_ISNDEP_STARTING,
>>  	CPUHP_AP_SMPCFD_DYING,
> 
> 
> Thanks,
> 
> 	M.
>
Marc Zyngier Aug. 8, 2019, 3:49 p.m. UTC | #3
On 08/08/2019 16:29, Steven Price wrote:
> On 04/08/2019 10:53, Marc Zyngier wrote:
>> On Fri,  2 Aug 2019 15:50:17 +0100
>> Steven Price <steven.price@arm.com> wrote:
>>
>>> Enable paravirtualization features when running under a hypervisor
>>> supporting the PV_TIME_ST hypercall.
>>>
>>> For each (v)CPU, we ask the hypervisor for the location of a shared
>>> page which the hypervisor will use to report stolen time to us. We set
>>> pv_time_ops to the stolen time function which simply reads the stolen
>>> value from the shared page for a VCPU. We guarantee single-copy
>>> atomicity using READ_ONCE which means we can also read the stolen
>>> time for another VCPU than the currently running one while it is
>>> potentially being updated by the hypervisor.
>>>
>>> Signed-off-by: Steven Price <steven.price@arm.com>
>>> ---
>>>  arch/arm64/kernel/Makefile |   1 +
>>>  arch/arm64/kernel/kvm.c    | 155 +++++++++++++++++++++++++++++++++++++

[...]

>>> +static int __init kvm_guest_init(void)
>>> +{
>>> +	int ret = 0;
>>> +
>>> +	if (!has_kvm_steal_clock())
>>> +		return 0;
>>> +
>>> +	ret = kvm_arm_init_stolen_time();
>>> +	if (ret)
>>> +		return ret;
>>> +
>>> +	pv_ops.time.steal_clock = kvm_steal_clock;
>>> +
>>> +	static_key_slow_inc(&paravirt_steal_enabled);
>>> +	if (steal_acc)
>>> +		static_key_slow_inc(&paravirt_steal_rq_enabled);
>>> +
>>> +	pr_info("using stolen time PV\n");
>>> +
>>> +	return 0;
>>> +}
>>> +early_initcall(kvm_guest_init);
>>
>> Is there any reason why we wouldn't directly call into this rather than
>> using an initcall?
> 
> I'm not sure where the direct call would go - any pointers?

I'd be temped to say arch/arm64/kernel/time.c:time_init(), provided that
there is no issue with the CPU hotplug lock (I remember hitting that a
while ago).

	M.
Zenghui Yu Aug. 9, 2019, 1:51 p.m. UTC | #4
On 2019/8/2 22:50, Steven Price wrote:
> Enable paravirtualization features when running under a hypervisor
> supporting the PV_TIME_ST hypercall.
> 
> For each (v)CPU, we ask the hypervisor for the location of a shared
> page which the hypervisor will use to report stolen time to us. We set
> pv_time_ops to the stolen time function which simply reads the stolen
> value from the shared page for a VCPU. We guarantee single-copy
> atomicity using READ_ONCE which means we can also read the stolen
> time for another VCPU than the currently running one while it is
> potentially being updated by the hypervisor.
> 
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>   arch/arm64/kernel/Makefile |   1 +
>   arch/arm64/kernel/kvm.c    | 155 +++++++++++++++++++++++++++++++++++++
>   include/linux/cpuhotplug.h |   1 +
>   3 files changed, 157 insertions(+)
>   create mode 100644 arch/arm64/kernel/kvm.c
> 
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index 478491f07b4f..eb36edf9b930 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_CRASH_CORE)		+= crash_core.o
>   obj-$(CONFIG_ARM_SDE_INTERFACE)		+= sdei.o
>   obj-$(CONFIG_ARM64_SSBD)		+= ssbd.o
>   obj-$(CONFIG_ARM64_PTR_AUTH)		+= pointer_auth.o
> +obj-$(CONFIG_PARAVIRT)			+= kvm.o
>   
>   obj-y					+= vdso/ probes/
>   obj-$(CONFIG_COMPAT_VDSO)		+= vdso32/
> diff --git a/arch/arm64/kernel/kvm.c b/arch/arm64/kernel/kvm.c
> new file mode 100644
> index 000000000000..245398c79dae
> --- /dev/null
> +++ b/arch/arm64/kernel/kvm.c
> @@ -0,0 +1,155 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2019 Arm Ltd.
> +
> +#define pr_fmt(fmt) "kvmarm-pv: " fmt
> +
> +#include <linux/arm-smccc.h>
> +#include <linux/cpuhotplug.h>
> +#include <linux/io.h>
> +#include <linux/printk.h>
> +#include <linux/psci.h>
> +#include <linux/reboot.h>
> +#include <linux/slab.h>
> +
> +#include <asm/paravirt.h>
> +#include <asm/pvclock-abi.h>
> +#include <asm/smp_plat.h>
> +
> +struct kvmarm_stolen_time_region {
> +	struct pvclock_vcpu_stolen_time_info *kaddr;
> +};
> +
> +static DEFINE_PER_CPU(struct kvmarm_stolen_time_region, stolen_time_region);
> +
> +static bool steal_acc = true;
> +static int __init parse_no_stealacc(char *arg)
> +{
> +	steal_acc = false;
> +	return 0;
> +}
> +early_param("no-steal-acc", parse_no_stealacc);
> +
> +/* return stolen time in ns by asking the hypervisor */
> +static u64 kvm_steal_clock(int cpu)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +
> +	reg = per_cpu_ptr(&stolen_time_region, cpu);
> +	if (!reg->kaddr) {
> +		pr_warn_once("stolen time enabled but not configured for cpu %d\n",
> +			     cpu);
> +		return 0;
> +	}
> +
> +	return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
> +}
> +
> +static int disable_stolen_time_current_cpu(void)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +
> +	reg = this_cpu_ptr(&stolen_time_region);
> +	if (!reg->kaddr)
> +		return 0;
> +
> +	memunmap(reg->kaddr);
> +	memset(reg, 0, sizeof(*reg));
> +
> +	return 0;
> +}
> +
> +static int stolen_time_dying_cpu(unsigned int cpu)
> +{
> +	return disable_stolen_time_current_cpu();
> +}
> +
> +static int init_stolen_time_cpu(unsigned int cpu)
> +{
> +	struct kvmarm_stolen_time_region *reg;
> +	struct arm_smccc_res res;
> +
> +	reg = this_cpu_ptr(&stolen_time_region);
> +
> +	if (reg->kaddr)
> +		return 0;
> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_ST, &res);
> +
> +	if ((long)res.a0 < 0)
> +		return -EINVAL;

Hi Steven,

Since userspace is not involved yet (right?), no one will create the
PV_TIME device for guest (and no one will specify the IPA of the shared
stolen time region), and I guess we will get a "not supported" error
here.

So what should we do if we want to test this series now?  Any userspace
tools?  If no, do you have any plans for userspace developing? ;-)


Thanks,
zenghui

> +
> +	reg->kaddr = memremap(res.a0,
> +			sizeof(struct pvclock_vcpu_stolen_time_info),
> +			MEMREMAP_WB);
> +
> +	if (reg->kaddr == NULL) {
> +		pr_warn("Failed to map stolen time data structure\n");
> +		return -EINVAL;
> +	}
> +
> +	if (le32_to_cpu(reg->kaddr->revision) != 0 ||
> +			le32_to_cpu(reg->kaddr->attributes) != 0) {
> +		pr_warn("Unexpected revision or attributes in stolen time data\n");
> +		return -ENXIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static int kvm_arm_init_stolen_time(void)
> +{
> +	int ret;
> +
> +	ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
> +				"hypervisor/kvmarm/pv:starting",
> +				init_stolen_time_cpu, stolen_time_dying_cpu);
> +	if (ret < 0)
> +		return ret;
> +	return 0;
> +}
> +
> +static bool has_kvm_steal_clock(void)
> +{
> +	struct arm_smccc_res res;
> +
> +	/* To detect the presence of PV time support we require SMCCC 1.1+ */
> +	if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
> +		return false;
> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
> +			     ARM_SMCCC_HV_PV_FEATURES, &res);
> +
> +	if (res.a0 != SMCCC_RET_SUCCESS)
> +		return false;
> +
> +	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_FEATURES,
> +			     ARM_SMCCC_HV_PV_TIME_ST, &res);
> +
> +	if (res.a0 != SMCCC_RET_SUCCESS)
> +		return false;
> +
> +	return true;
> +}
> +
> +static int __init kvm_guest_init(void)
> +{
> +	int ret = 0;
> +
> +	if (!has_kvm_steal_clock())
> +		return 0;
> +
> +	ret = kvm_arm_init_stolen_time();
> +	if (ret)
> +		return ret;
> +
> +	pv_ops.time.steal_clock = kvm_steal_clock;
> +
> +	static_key_slow_inc(&paravirt_steal_enabled);
> +	if (steal_acc)
> +		static_key_slow_inc(&paravirt_steal_rq_enabled);
> +
> +	pr_info("using stolen time PV\n");
> +
> +	return 0;
> +}
> +early_initcall(kvm_guest_init);
> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> index 068793a619ca..89d75edb5750 100644
> --- a/include/linux/cpuhotplug.h
> +++ b/include/linux/cpuhotplug.h
> @@ -136,6 +136,7 @@ enum cpuhp_state {
>   	/* Must be the last timer callback */
>   	CPUHP_AP_DUMMY_TIMER_STARTING,
>   	CPUHP_AP_ARM_XEN_STARTING,
> +	CPUHP_AP_ARM_KVMPV_STARTING,
>   	CPUHP_AP_ARM_CORESIGHT_STARTING,
>   	CPUHP_AP_ARM64_ISNDEP_STARTING,
>   	CPUHP_AP_SMPCFD_DYING,
>
Steven Price Aug. 12, 2019, 10:39 a.m. UTC | #5
On 09/08/2019 14:51, Zenghui Yu wrote:
[...]
> Hi Steven,
> 
> Since userspace is not involved yet (right?), no one will create the
> PV_TIME device for guest (and no one will specify the IPA of the shared
> stolen time region), and I guess we will get a "not supported" error
> here.
> 
> So what should we do if we want to test this series now?  Any userspace
> tools?  If no, do you have any plans for userspace developing? ;-)

At the moment I have the following patch to kvmtool which creates the
PV_TIME device - this isn't in a state to go upstream, and Marc has
asked that I rework the memory allocation, so this will need to change.

It's a little ugly as it simply reserves the first page of RAM to use
for the PV time structures.

----8<----
diff --git a/Makefile b/Makefile
index 3862112..a79956b 100644
--- a/Makefile
+++ b/Makefile
@@ -158,7 +158,7 @@ endif
 # ARM
 OBJS_ARM_COMMON		:= arm/fdt.o arm/gic.o arm/gicv2m.o arm/ioport.o \
 			   arm/kvm.o arm/kvm-cpu.o arm/pci.o arm/timer.o \
-			   arm/pmu.o
+			   arm/pmu.o arm/pvtime.o
 HDRS_ARM_COMMON		:= arm/include
 ifeq ($(ARCH), arm)
 	DEFINES		+= -DCONFIG_ARM
diff --git a/arm/fdt.c b/arm/fdt.c
index c80e6da..19eccbc 100644
--- a/arm/fdt.c
+++ b/arm/fdt.c
@@ -119,6 +119,7 @@ static int setup_fdt(struct kvm *kvm)
 
 	/* Create new tree without a reserve map */
 	_FDT(fdt_create(fdt, FDT_MAX_SIZE));
+	_FDT(fdt_add_reservemap_entry(fdt, kvm->arch.memory_guest_start, 4096));
 	_FDT(fdt_finish_reservemap(fdt));
 
 	/* Header */
diff --git a/arm/kvm.c b/arm/kvm.c
index 1f85fc6..8bbfef1 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -11,6 +11,8 @@
 #include <linux/kvm.h>
 #include <linux/sizes.h>
 
+int pvtime_create(struct kvm *kvm);
+
 struct kvm_ext kvm_req_ext[] = {
 	{ DEFINE_KVM_EXT(KVM_CAP_IRQCHIP) },
 	{ DEFINE_KVM_EXT(KVM_CAP_ONE_REG) },
@@ -86,6 +88,10 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
 	/* Create the virtual GIC. */
 	if (gic__create(kvm, kvm->cfg.arch.irqchip))
 		die("Failed to create virtual GIC");
+
+	/* Setup PV time */
+	if (pvtime_create(kvm))
+		die("Failed to initialise PV time");
 }
 
 #define FDT_ALIGN	SZ_2M
diff --git a/arm/pvtime.c b/arm/pvtime.c
new file mode 100644
index 0000000..abcaab3
--- /dev/null
+++ b/arm/pvtime.c
@@ -0,0 +1,77 @@
+#include "kvm/kvm.h"
+
+#define KVM_DEV_TYPE_ARM_PV_TIME (KVM_DEV_TYPE_ARM_VGIC_ITS+2)
+
+/* Device Control API: PV_TIME */
+#define KVM_DEV_ARM_PV_TIME_PADDR	0
+#define KVM_DEV_ARM_PV_TIME_FREQUENCY	3
+
+#define KVM_DEV_ARM_PV_TIME_ST		0
+#define KVM_DEV_ARM_PV_TIME_LPT		1
+
+static int pvtime_fd;
+
+int pvtime_create(struct kvm *kvm);
+
+int pvtime_create(struct kvm *kvm)
+{
+	int err;
+	u64 lpt_paddr = 0x10000000;
+	u64 st_paddr = lpt_paddr + 4096;
+	u32 frequency = 100 * 1000 * 1000;
+
+	printf("lpt_paddr=%llx\n", lpt_paddr);
+
+	struct kvm_create_device pvtime_device = {
+		.type = KVM_DEV_TYPE_ARM_PV_TIME,
+		.flags = 0,
+	};
+
+	err = ioctl(kvm->vm_fd, KVM_CREATE_DEVICE, &pvtime_device);
+	if (err) {
+		printf("Failed to create PV device\n");
+		return 0;
+	}
+
+	pvtime_fd = pvtime_device.fd;
+
+	struct kvm_device_attr lpt_base = {
+		.group = KVM_DEV_ARM_PV_TIME_PADDR,
+		.attr = KVM_DEV_ARM_PV_TIME_LPT,
+		.addr = (u64)(unsigned long)&lpt_paddr
+	};
+	struct kvm_device_attr st_base = {
+		.group = KVM_DEV_ARM_PV_TIME_PADDR,
+		.attr = KVM_DEV_ARM_PV_TIME_ST,
+		.addr = (u64)(unsigned long)&st_paddr
+	};
+
+	struct kvm_device_attr lpt_freq = {
+		.group = KVM_DEV_ARM_PV_TIME_FREQUENCY,
+		.attr = KVM_DEV_ARM_PV_TIME_LPT,
+		.addr = (u64)(unsigned long)&frequency
+	};
+
+	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &lpt_base);
+	if (err) {
+		perror("ioctl lpt_base failed");
+		printf("Ignoring LPT...\n");
+	}
+	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &st_base);
+	if (err) {
+		perror("ioctl st_base failed");
+		goto out_err;
+	}
+	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &lpt_freq);
+	if (err) {
+		perror("ioctl lpt_freq failed");
+		printf("Ignoring LPT...\n");
+	}
+
+	printf("PV time setup\n");
+
+	return 0;
+out_err:
+	close(pvtime_fd);
+	return err;
+}
Zenghui Yu Aug. 13, 2019, 6:06 a.m. UTC | #6
On 2019/8/12 18:39, Steven Price wrote:
> On 09/08/2019 14:51, Zenghui Yu wrote:
> [...]
>> Hi Steven,
>>
>> Since userspace is not involved yet (right?), no one will create the
>> PV_TIME device for guest (and no one will specify the IPA of the shared
>> stolen time region), and I guess we will get a "not supported" error
>> here.
>>
>> So what should we do if we want to test this series now?  Any userspace
>> tools?  If no, do you have any plans for userspace developing? ;-)
> 
> At the moment I have the following patch to kvmtool which creates the
> PV_TIME device - this isn't in a state to go upstream, and Marc has
> asked that I rework the memory allocation, so this will need to change.
> 
> It's a little ugly as it simply reserves the first page of RAM to use
> for the PV time structures.

Thanks for sharing the code. It's good enough to show what is required
in user-space.

(I'm not familiar with kvmtool. I will first take some time to move the
steal time part to Qemu and see what will happen.)


Thanks,
zenghui

> ----8<----
> diff --git a/Makefile b/Makefile
> index 3862112..a79956b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -158,7 +158,7 @@ endif
>   # ARM
>   OBJS_ARM_COMMON		:= arm/fdt.o arm/gic.o arm/gicv2m.o arm/ioport.o \
>   			   arm/kvm.o arm/kvm-cpu.o arm/pci.o arm/timer.o \
> -			   arm/pmu.o
> +			   arm/pmu.o arm/pvtime.o
>   HDRS_ARM_COMMON		:= arm/include
>   ifeq ($(ARCH), arm)
>   	DEFINES		+= -DCONFIG_ARM
> diff --git a/arm/fdt.c b/arm/fdt.c
> index c80e6da..19eccbc 100644
> --- a/arm/fdt.c
> +++ b/arm/fdt.c
> @@ -119,6 +119,7 @@ static int setup_fdt(struct kvm *kvm)
>   
>   	/* Create new tree without a reserve map */
>   	_FDT(fdt_create(fdt, FDT_MAX_SIZE));
> +	_FDT(fdt_add_reservemap_entry(fdt, kvm->arch.memory_guest_start, 4096));
>   	_FDT(fdt_finish_reservemap(fdt));
>   
>   	/* Header */
> diff --git a/arm/kvm.c b/arm/kvm.c
> index 1f85fc6..8bbfef1 100644
> --- a/arm/kvm.c
> +++ b/arm/kvm.c
> @@ -11,6 +11,8 @@
>   #include <linux/kvm.h>
>   #include <linux/sizes.h>
>   
> +int pvtime_create(struct kvm *kvm);
> +
>   struct kvm_ext kvm_req_ext[] = {
>   	{ DEFINE_KVM_EXT(KVM_CAP_IRQCHIP) },
>   	{ DEFINE_KVM_EXT(KVM_CAP_ONE_REG) },
> @@ -86,6 +88,10 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
>   	/* Create the virtual GIC. */
>   	if (gic__create(kvm, kvm->cfg.arch.irqchip))
>   		die("Failed to create virtual GIC");
> +
> +	/* Setup PV time */
> +	if (pvtime_create(kvm))
> +		die("Failed to initialise PV time");
>   }
>   
>   #define FDT_ALIGN	SZ_2M
> diff --git a/arm/pvtime.c b/arm/pvtime.c
> new file mode 100644
> index 0000000..abcaab3
> --- /dev/null
> +++ b/arm/pvtime.c
> @@ -0,0 +1,77 @@
> +#include "kvm/kvm.h"
> +
> +#define KVM_DEV_TYPE_ARM_PV_TIME (KVM_DEV_TYPE_ARM_VGIC_ITS+2)
> +
> +/* Device Control API: PV_TIME */
> +#define KVM_DEV_ARM_PV_TIME_PADDR	0
> +#define KVM_DEV_ARM_PV_TIME_FREQUENCY	3
> +
> +#define KVM_DEV_ARM_PV_TIME_ST		0
> +#define KVM_DEV_ARM_PV_TIME_LPT		1
> +
> +static int pvtime_fd;
> +
> +int pvtime_create(struct kvm *kvm);
> +
> +int pvtime_create(struct kvm *kvm)
> +{
> +	int err;
> +	u64 lpt_paddr = 0x10000000;
> +	u64 st_paddr = lpt_paddr + 4096;
> +	u32 frequency = 100 * 1000 * 1000;
> +
> +	printf("lpt_paddr=%llx\n", lpt_paddr);
> +
> +	struct kvm_create_device pvtime_device = {
> +		.type = KVM_DEV_TYPE_ARM_PV_TIME,
> +		.flags = 0,
> +	};
> +
> +	err = ioctl(kvm->vm_fd, KVM_CREATE_DEVICE, &pvtime_device);
> +	if (err) {
> +		printf("Failed to create PV device\n");
> +		return 0;
> +	}
> +
> +	pvtime_fd = pvtime_device.fd;
> +
> +	struct kvm_device_attr lpt_base = {
> +		.group = KVM_DEV_ARM_PV_TIME_PADDR,
> +		.attr = KVM_DEV_ARM_PV_TIME_LPT,
> +		.addr = (u64)(unsigned long)&lpt_paddr
> +	};
> +	struct kvm_device_attr st_base = {
> +		.group = KVM_DEV_ARM_PV_TIME_PADDR,
> +		.attr = KVM_DEV_ARM_PV_TIME_ST,
> +		.addr = (u64)(unsigned long)&st_paddr
> +	};
> +
> +	struct kvm_device_attr lpt_freq = {
> +		.group = KVM_DEV_ARM_PV_TIME_FREQUENCY,
> +		.attr = KVM_DEV_ARM_PV_TIME_LPT,
> +		.addr = (u64)(unsigned long)&frequency
> +	};
> +
> +	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &lpt_base);
> +	if (err) {
> +		perror("ioctl lpt_base failed");
> +		printf("Ignoring LPT...\n");
> +	}
> +	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &st_base);
> +	if (err) {
> +		perror("ioctl st_base failed");
> +		goto out_err;
> +	}
> +	err = ioctl(pvtime_fd, KVM_SET_DEVICE_ATTR, &lpt_freq);
> +	if (err) {
> +		perror("ioctl lpt_freq failed");
> +		printf("Ignoring LPT...\n");
> +	}
> +
> +	printf("PV time setup\n");
> +
> +	return 0;
> +out_err:
> +	close(pvtime_fd);
> +	return err;
> +}
diff mbox series

Patch

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 478491f07b4f..eb36edf9b930 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -63,6 +63,7 @@  obj-$(CONFIG_CRASH_CORE)		+= crash_core.o
 obj-$(CONFIG_ARM_SDE_INTERFACE)		+= sdei.o
 obj-$(CONFIG_ARM64_SSBD)		+= ssbd.o
 obj-$(CONFIG_ARM64_PTR_AUTH)		+= pointer_auth.o
+obj-$(CONFIG_PARAVIRT)			+= kvm.o
 
 obj-y					+= vdso/ probes/
 obj-$(CONFIG_COMPAT_VDSO)		+= vdso32/
diff --git a/arch/arm64/kernel/kvm.c b/arch/arm64/kernel/kvm.c
new file mode 100644
index 000000000000..245398c79dae
--- /dev/null
+++ b/arch/arm64/kernel/kvm.c
@@ -0,0 +1,155 @@ 
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Arm Ltd.
+
+#define pr_fmt(fmt) "kvmarm-pv: " fmt
+
+#include <linux/arm-smccc.h>
+#include <linux/cpuhotplug.h>
+#include <linux/io.h>
+#include <linux/printk.h>
+#include <linux/psci.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+
+#include <asm/paravirt.h>
+#include <asm/pvclock-abi.h>
+#include <asm/smp_plat.h>
+
+struct kvmarm_stolen_time_region {
+	struct pvclock_vcpu_stolen_time_info *kaddr;
+};
+
+static DEFINE_PER_CPU(struct kvmarm_stolen_time_region, stolen_time_region);
+
+static bool steal_acc = true;
+static int __init parse_no_stealacc(char *arg)
+{
+	steal_acc = false;
+	return 0;
+}
+early_param("no-steal-acc", parse_no_stealacc);
+
+/* return stolen time in ns by asking the hypervisor */
+static u64 kvm_steal_clock(int cpu)
+{
+	struct kvmarm_stolen_time_region *reg;
+
+	reg = per_cpu_ptr(&stolen_time_region, cpu);
+	if (!reg->kaddr) {
+		pr_warn_once("stolen time enabled but not configured for cpu %d\n",
+			     cpu);
+		return 0;
+	}
+
+	return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
+}
+
+static int disable_stolen_time_current_cpu(void)
+{
+	struct kvmarm_stolen_time_region *reg;
+
+	reg = this_cpu_ptr(&stolen_time_region);
+	if (!reg->kaddr)
+		return 0;
+
+	memunmap(reg->kaddr);
+	memset(reg, 0, sizeof(*reg));
+
+	return 0;
+}
+
+static int stolen_time_dying_cpu(unsigned int cpu)
+{
+	return disable_stolen_time_current_cpu();
+}
+
+static int init_stolen_time_cpu(unsigned int cpu)
+{
+	struct kvmarm_stolen_time_region *reg;
+	struct arm_smccc_res res;
+
+	reg = this_cpu_ptr(&stolen_time_region);
+
+	if (reg->kaddr)
+		return 0;
+
+	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_ST, &res);
+
+	if ((long)res.a0 < 0)
+		return -EINVAL;
+
+	reg->kaddr = memremap(res.a0,
+			sizeof(struct pvclock_vcpu_stolen_time_info),
+			MEMREMAP_WB);
+
+	if (reg->kaddr == NULL) {
+		pr_warn("Failed to map stolen time data structure\n");
+		return -EINVAL;
+	}
+
+	if (le32_to_cpu(reg->kaddr->revision) != 0 ||
+			le32_to_cpu(reg->kaddr->attributes) != 0) {
+		pr_warn("Unexpected revision or attributes in stolen time data\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int kvm_arm_init_stolen_time(void)
+{
+	int ret;
+
+	ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
+				"hypervisor/kvmarm/pv:starting",
+				init_stolen_time_cpu, stolen_time_dying_cpu);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static bool has_kvm_steal_clock(void)
+{
+	struct arm_smccc_res res;
+
+	/* To detect the presence of PV time support we require SMCCC 1.1+ */
+	if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
+		return false;
+
+	arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
+			     ARM_SMCCC_HV_PV_FEATURES, &res);
+
+	if (res.a0 != SMCCC_RET_SUCCESS)
+		return false;
+
+	arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_FEATURES,
+			     ARM_SMCCC_HV_PV_TIME_ST, &res);
+
+	if (res.a0 != SMCCC_RET_SUCCESS)
+		return false;
+
+	return true;
+}
+
+static int __init kvm_guest_init(void)
+{
+	int ret = 0;
+
+	if (!has_kvm_steal_clock())
+		return 0;
+
+	ret = kvm_arm_init_stolen_time();
+	if (ret)
+		return ret;
+
+	pv_ops.time.steal_clock = kvm_steal_clock;
+
+	static_key_slow_inc(&paravirt_steal_enabled);
+	if (steal_acc)
+		static_key_slow_inc(&paravirt_steal_rq_enabled);
+
+	pr_info("using stolen time PV\n");
+
+	return 0;
+}
+early_initcall(kvm_guest_init);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 068793a619ca..89d75edb5750 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -136,6 +136,7 @@  enum cpuhp_state {
 	/* Must be the last timer callback */
 	CPUHP_AP_DUMMY_TIMER_STARTING,
 	CPUHP_AP_ARM_XEN_STARTING,
+	CPUHP_AP_ARM_KVMPV_STARTING,
 	CPUHP_AP_ARM_CORESIGHT_STARTING,
 	CPUHP_AP_ARM64_ISNDEP_STARTING,
 	CPUHP_AP_SMPCFD_DYING,