From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This command returns the memory type for a guest physical address.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Co-developed-by: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
Signed-off-by: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virtual/kvm/kvmi.rst | 32 ++++++++++++++++++++++++++++++
arch/x86/include/uapi/asm/kvmi.h | 9 +++++++++
arch/x86/kvm/kvmi.c | 7 +++++++
virt/kvm/kvmi_int.h | 1 +
virt/kvm/kvmi_msg.c | 17 ++++++++++++++++
5 files changed, 66 insertions(+)
diff --git a/Documentation/virtual/kvm/kvmi.rst b/Documentation/virtual/kvm/kvmi.rst
index c43ea1b33a51..e58f0e22f188 100644
--- a/Documentation/virtual/kvm/kvmi.rst
+++ b/Documentation/virtual/kvm/kvmi.rst
@@ -1112,6 +1112,38 @@ the buffer size from the message size.
* -KVM_EAGAIN - the selected vCPU can't be introspected yet
* -KVM_ENOMEM - not enough memory to allocate the reply
+24. KVMI_GET_MTRR_TYPE
+----------------------
+
+:Architecture: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+ struct kvmi_get_mtrr_type {
+ __u64 gpa;
+ };
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+ struct kvmi_get_mtrr_type_reply {
+ __u8 type;
+ __u8 padding[7];
+ };
+
+Returns the guest memory type for a specific physical address.
+
+: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/include/uapi/asm/kvmi.h b/arch/x86/include/uapi/asm/kvmi.h
index a3fcb1ef8404..c3c96e6e2a26 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -101,4 +101,13 @@ struct kvmi_get_xsave_reply {
__u32 region[0];
};
+struct kvmi_get_mtrr_type {
+ __u64 gpa;
+};
+
+struct kvmi_get_mtrr_type_reply {
+ __u8 type;
+ __u8 padding[7];
+};
+
#endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index 078d714b59d5..0114ed66f4f3 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -811,3 +811,10 @@ int kvmi_arch_cmd_get_xsave(struct kvm_vcpu *vcpu,
return 0;
}
+
+int kvmi_arch_cmd_get_mtrr_type(struct kvm_vcpu *vcpu, u64 gpa, u8 *type)
+{
+ *type = kvm_mtrr_get_guest_memory_type(vcpu, gpa_to_gfn(gpa));
+
+ return 0;
+}
diff --git a/virt/kvm/kvmi_int.h b/virt/kvm/kvmi_int.h
index 1a705cba4776..ac2e13787f01 100644
--- a/virt/kvm/kvmi_int.h
+++ b/virt/kvm/kvmi_int.h
@@ -267,5 +267,6 @@ int kvmi_arch_cmd_control_cr(struct kvm_vcpu *vcpu,
const struct kvmi_control_cr *req);
int kvmi_arch_cmd_control_msr(struct kvm_vcpu *vcpu,
const struct kvmi_control_msr *req);
+int kvmi_arch_cmd_get_mtrr_type(struct kvm_vcpu *vcpu, u64 gpa, u8 *type);
#endif
diff --git a/virt/kvm/kvmi_msg.c b/virt/kvm/kvmi_msg.c
index 6bc18b7973cf..ee54d92b07ec 100644
--- a/virt/kvm/kvmi_msg.c
+++ b/virt/kvm/kvmi_msg.c
@@ -33,6 +33,7 @@ static const char *const msg_IDs[] = {
[KVMI_EVENT_REPLY] = "KVMI_EVENT_REPLY",
[KVMI_GET_CPUID] = "KVMI_GET_CPUID",
[KVMI_GET_GUEST_INFO] = "KVMI_GET_GUEST_INFO",
+ [KVMI_GET_MTRR_TYPE] = "KVMI_GET_MTRR_TYPE",
[KVMI_GET_PAGE_ACCESS] = "KVMI_GET_PAGE_ACCESS",
[KVMI_GET_PAGE_WRITE_BITMAP] = "KVMI_GET_PAGE_WRITE_BITMAP",
[KVMI_GET_REGISTERS] = "KVMI_GET_REGISTERS",
@@ -701,6 +702,21 @@ static int handle_get_cpuid(struct kvm_vcpu *vcpu,
return reply_cb(vcpu, msg, ec, &rpl, sizeof(rpl));
}
+static int handle_get_mtrr_type(struct kvm_vcpu *vcpu,
+ const struct kvmi_msg_hdr *msg,
+ const void *_req, vcpu_reply_fct reply_cb)
+{
+ const struct kvmi_get_mtrr_type *req = _req;
+ struct kvmi_get_mtrr_type_reply rpl;
+ int ec;
+
+ memset(&rpl, 0, sizeof(rpl));
+
+ ec = kvmi_arch_cmd_get_mtrr_type(vcpu, req->gpa, &rpl.type);
+
+ return reply_cb(vcpu, msg, ec, &rpl, sizeof(rpl));
+}
+
static int handle_get_xsave(struct kvm_vcpu *vcpu,
const struct kvmi_msg_hdr *msg, const void *req,
vcpu_reply_fct reply_cb)
@@ -730,6 +746,7 @@ static int(*const msg_vcpu[])(struct kvm_vcpu *,
[KVMI_CONTROL_MSR] = handle_control_msr,
[KVMI_EVENT_REPLY] = handle_event_reply,
[KVMI_GET_CPUID] = handle_get_cpuid,
+ [KVMI_GET_MTRR_TYPE] = handle_get_mtrr_type,
[KVMI_GET_REGISTERS] = handle_get_registers,
[KVMI_GET_VCPU_INFO] = handle_get_vcpu_info,
[KVMI_GET_XSAVE] = handle_get_xsave,
