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From: Peng Liang <liangpeng10@huawei.com>
To: <kvmarm@lists.cs.columbia.edu>
Cc: zhang.zhanghailiang@huawei.com, kvm@vger.kernel.org,
	maz@kernel.org, will@kernel.org
Subject: [RFC v2 7/7] kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension
Date: Thu, 17 Sep 2020 20:01:01 +0800	[thread overview]
Message-ID: <20200917120101.3438389-8-liangpeng10@huawei.com> (raw)
In-Reply-To: <20200917120101.3438389-1-liangpeng10@huawei.com>

Add KVM_CAP_ARM_CPU_FEATURE extension for userpace to check whether KVM
supports to set CPU features in AArch64.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 Documentation/virt/kvm/api.rst | 8 ++++++++
 arch/arm64/kvm/arm.c           | 1 +
 include/uapi/linux/kvm.h       | 1 +
 3 files changed, 10 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index d2b733dc7892..50214ed8f50e 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6173,3 +6173,11 @@ specific interfaces must be consistent, i.e. if one says the feature
 is supported, than the other should as well and vice versa.  For arm64
 see Documentation/virt/kvm/devices/vcpu.rst "KVM_ARM_VCPU_PVTIME_CTRL".
 For x86 see Documentation/virt/kvm/msr.rst "MSR_KVM_STEAL_TIME".
+
+8.25 KVM_CAP_ARM_CPU_FEATURE
+-----------------------------------
+
+:Architecture: arm64
+
+This capability indicates that userspace can modify the ID registers via
+KVM_SET_ONE_REG ioctl.
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 6d961e192268..918a7a56b224 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -178,6 +178,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
 	case KVM_CAP_ARM_NISV_TO_USER:
 	case KVM_CAP_ARM_INJECT_EXT_DABT:
+	case KVM_CAP_ARM_CPU_FEATURE:
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 7d8eced6f459..12356beadd5a 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1037,6 +1037,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_SMALLER_MAXPHYADDR 185
 #define KVM_CAP_S390_DIAG318 186
 #define KVM_CAP_STEAL_TIME 187
+#define KVM_CAP_ARM_CPU_FEATURE 188
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.26.2

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WARNING: multiple messages have this Message-ID (diff)
From: Peng Liang <liangpeng10@huawei.com>
To: <kvmarm@lists.cs.columbia.edu>
Cc: <kvm@vger.kernel.org>, <maz@kernel.org>, <will@kernel.org>,
	<drjones@redhat.com>, <zhang.zhanghailiang@huawei.com>,
	<xiexiangyou@huawei.com>, Peng Liang <liangpeng10@huawei.com>
Subject: [RFC v2 7/7] kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension
Date: Thu, 17 Sep 2020 20:01:01 +0800	[thread overview]
Message-ID: <20200917120101.3438389-8-liangpeng10@huawei.com> (raw)
In-Reply-To: <20200917120101.3438389-1-liangpeng10@huawei.com>

Add KVM_CAP_ARM_CPU_FEATURE extension for userpace to check whether KVM
supports to set CPU features in AArch64.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 Documentation/virt/kvm/api.rst | 8 ++++++++
 arch/arm64/kvm/arm.c           | 1 +
 include/uapi/linux/kvm.h       | 1 +
 3 files changed, 10 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index d2b733dc7892..50214ed8f50e 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6173,3 +6173,11 @@ specific interfaces must be consistent, i.e. if one says the feature
 is supported, than the other should as well and vice versa.  For arm64
 see Documentation/virt/kvm/devices/vcpu.rst "KVM_ARM_VCPU_PVTIME_CTRL".
 For x86 see Documentation/virt/kvm/msr.rst "MSR_KVM_STEAL_TIME".
+
+8.25 KVM_CAP_ARM_CPU_FEATURE
+-----------------------------------
+
+:Architecture: arm64
+
+This capability indicates that userspace can modify the ID registers via
+KVM_SET_ONE_REG ioctl.
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 6d961e192268..918a7a56b224 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -178,6 +178,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
 	case KVM_CAP_ARM_NISV_TO_USER:
 	case KVM_CAP_ARM_INJECT_EXT_DABT:
+	case KVM_CAP_ARM_CPU_FEATURE:
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 7d8eced6f459..12356beadd5a 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1037,6 +1037,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_SMALLER_MAXPHYADDR 185
 #define KVM_CAP_S390_DIAG318 186
 #define KVM_CAP_STEAL_TIME 187
+#define KVM_CAP_ARM_CPU_FEATURE 188
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.26.2


  parent reply	other threads:[~2020-09-17 12:10 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17 12:00 [RFC v2 0/7] kvm: arm64: emulate ID registers Peng Liang
2020-09-17 12:00 ` Peng Liang
2020-09-17 12:00 ` [RFC v2 1/7] arm64: add a helper function to traverse arm64_ftr_regs Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:18   ` Andrew Jones
2020-09-18  7:18     ` Andrew Jones
2020-09-18  9:24     ` Peng Liang
2020-09-18  9:24       ` Peng Liang
2020-09-18 10:28       ` Andrew Jones
2020-09-18 10:28         ` Andrew Jones
2020-09-18 11:58         ` Peng Liang
2020-09-18 11:58           ` Peng Liang
2020-09-17 12:00 ` [RFC v2 2/7] arm64: introduce check_features Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:30   ` Andrew Jones
2020-09-18  7:30     ` Andrew Jones
2020-09-18  9:25     ` Peng Liang
2020-09-18  9:25       ` Peng Liang
2020-09-17 12:00 ` [RFC v2 3/7] kvm: arm64: save ID registers to sys_regs file Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:34   ` Andrew Jones
2020-09-18  7:34     ` Andrew Jones
2020-09-17 12:00 ` [RFC v2 4/7] kvm: arm64: introduce check_user Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:41   ` Andrew Jones
2020-09-18  7:41     ` Andrew Jones
2020-09-18  9:25     ` Peng Liang
2020-09-18  9:25       ` Peng Liang
2020-09-17 12:00 ` [RFC v2 5/7] kvm: arm64: implement check_user for ID registers Peng Liang
2020-09-17 12:00   ` Peng Liang
2020-09-18  7:46   ` Andrew Jones
2020-09-18  7:46     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-17 12:01 ` [RFC v2 6/7] kvm: arm64: make ID registers configurable Peng Liang
2020-09-17 12:01   ` Peng Liang
2020-09-18  7:50   ` Andrew Jones
2020-09-18  7:50     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-17 12:01 ` Peng Liang [this message]
2020-09-17 12:01   ` [RFC v2 7/7] kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension Peng Liang
2020-09-18  7:55   ` Andrew Jones
2020-09-18  7:55     ` Andrew Jones
2020-09-18  9:26     ` Peng Liang
2020-09-18  9:26       ` Peng Liang
2020-09-18  8:01 ` [RFC v2 0/7] kvm: arm64: emulate ID registers Andrew Jones
2020-09-18  8:01   ` Andrew Jones
2020-09-18  9:51   ` Peng Liang
2020-09-18  9:51     ` Peng Liang
2020-09-18 10:20     ` Andrew Jones
2020-09-18 10:20       ` Andrew Jones

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