From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
For now, this command returns the TSC frequency (in HZ) for the specified
vCPU if available (otherwise it returns zero).
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virtual/kvm/kvmi.rst | 29 +++++++++++++++++++++++++++++
arch/x86/kvm/kvmi.c | 12 ++++++++++++
include/uapi/linux/kvmi.h | 4 ++++
virt/kvm/kvmi_int.h | 2 ++
virt/kvm/kvmi_msg.c | 14 ++++++++++++++
5 files changed, 61 insertions(+)
diff --git a/Documentation/virtual/kvm/kvmi.rst b/Documentation/virtual/kvm/kvmi.rst
index b29cd1b80b4f..71897338e85a 100644
--- a/Documentation/virtual/kvm/kvmi.rst
+++ b/Documentation/virtual/kvm/kvmi.rst
@@ -427,6 +427,35 @@ in almost all cases, it must reply with: continue, retry, crash, etc.
* -KVM_EINVAL - padding is not zero
* -KVM_EPERM - the access is restricted by the host
+7. KVMI_GET_VCPU_INFO
+---------------------
+
+:Architectures: all
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+ struct kvmi_get_vcpu_info_reply {
+ __u64 tsc_speed;
+ };
+
+Returns the TSC frequency (in HZ) for the specified vCPU if available
+(otherwise it returns zero).
+
+:Errors:
+
+* -KVM_EINVAL - the selected vCPU is invalid
+* -KVM_EINVAL - padding is not zero
+* -KVM_EAGAIN - the selected vCPU can't be introspected yet
+
Events
======
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index 9aecca551673..97c72cdc6fb0 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -90,3 +90,15 @@ void kvmi_arch_setup_event(struct kvm_vcpu *vcpu, struct kvmi_event *ev)
ev->arch.mode = kvmi_vcpu_mode(vcpu, &event->sregs);
kvmi_get_msrs(vcpu, event);
}
+
+int kvmi_arch_cmd_get_vcpu_info(struct kvm_vcpu *vcpu,
+ struct kvmi_get_vcpu_info_reply *rpl)
+{
+ if (kvm_has_tsc_control)
+ rpl->tsc_speed = 1000ul * vcpu->arch.virtual_tsc_khz;
+ else
+ rpl->tsc_speed = 0;
+
+ return 0;
+}
+
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index ccf2239b5db4..aa5bc909e278 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -112,6 +112,10 @@ struct kvmi_get_guest_info_reply {
__u32 padding[3];
};
+struct kvmi_get_vcpu_info_reply {
+ __u64 tsc_speed;
+};
+
struct kvmi_control_vm_events {
__u16 event_id;
__u8 enable;
diff --git a/virt/kvm/kvmi_int.h b/virt/kvm/kvmi_int.h
index c21f0fd5e16c..7cff91bc1acc 100644
--- a/virt/kvm/kvmi_int.h
+++ b/virt/kvm/kvmi_int.h
@@ -139,5 +139,7 @@ int kvmi_add_job(struct kvm_vcpu *vcpu,
/* arch */
void kvmi_arch_setup_event(struct kvm_vcpu *vcpu, struct kvmi_event *ev);
+int kvmi_arch_cmd_get_vcpu_info(struct kvm_vcpu *vcpu,
+ struct kvmi_get_vcpu_info_reply *rpl);
#endif
diff --git a/virt/kvm/kvmi_msg.c b/virt/kvm/kvmi_msg.c
index 8e8af572a4f4..3372d8c7e74f 100644
--- a/virt/kvm/kvmi_msg.c
+++ b/virt/kvm/kvmi_msg.c
@@ -28,6 +28,7 @@ static const char *const msg_IDs[] = {
[KVMI_EVENT] = "KVMI_EVENT",
[KVMI_EVENT_REPLY] = "KVMI_EVENT_REPLY",
[KVMI_GET_GUEST_INFO] = "KVMI_GET_GUEST_INFO",
+ [KVMI_GET_VCPU_INFO] = "KVMI_GET_VCPU_INFO",
[KVMI_GET_VERSION] = "KVMI_GET_VERSION",
};
@@ -390,6 +391,18 @@ static int handle_event_reply(struct kvm_vcpu *vcpu,
return expected->error;
}
+static int handle_get_vcpu_info(struct kvm_vcpu *vcpu,
+ const struct kvmi_msg_hdr *msg,
+ const void *req, vcpu_reply_fct reply_cb)
+{
+ struct kvmi_get_vcpu_info_reply rpl;
+
+ memset(&rpl, 0, sizeof(rpl));
+ kvmi_arch_cmd_get_vcpu_info(vcpu, &rpl);
+
+ return reply_cb(vcpu, msg, 0, &rpl, sizeof(rpl));
+}
+
/*
* These commands are executed on the vCPU thread. The receiving thread
* passes the messages using a newly allocated 'struct kvmi_vcpu_cmd'
@@ -400,6 +413,7 @@ static int(*const msg_vcpu[])(struct kvm_vcpu *,
const struct kvmi_msg_hdr *, const void *,
vcpu_reply_fct) = {
[KVMI_EVENT_REPLY] = handle_event_reply,
+ [KVMI_GET_VCPU_INFO] = handle_get_vcpu_info,
};
static void kvmi_job_vcpu_cmd(struct kvm_vcpu *vcpu, void *_ctx)
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