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 <nicu.citu@xxxxxxxxxx>
Signed-off-by: Nicușor Cîțu <nicu.citu@xxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virt/kvm/kvmi.rst | 32 +++++++++++++++++++
arch/x86/include/uapi/asm/kvmi.h | 9 ++++++
arch/x86/kvm/kvmi_msg.c | 17 ++++++++++
include/uapi/linux/kvmi.h | 1 +
.../testing/selftests/kvm/x86_64/kvmi_test.c | 18 +++++++++++
5 files changed, 77 insertions(+)
diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index 56efeeb38980..58b50464b5f6 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -887,6 +887,38 @@ Modifies the XSAVE area.
* -KVM_EINVAL - the padding is not zero
* -KVM_EAGAIN - the selected vCPU can't be introspected yet
+21. KVMI_VCPU_GET_MTRR_TYPE
+---------------------------
+
+:Architectures: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+ struct kvmi_vcpu_get_mtrr_type {
+ __u64 gpa;
+ };
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+ struct kvmi_vcpu_get_mtrr_type_reply {
+ __u8 type;
+ __u8 padding[7];
+ };
+
+Returns the guest memory type for a specific guest physical address (``gpa``).
+
+:Errors:
+
+* -KVM_EINVAL - the selected vCPU is invalid
+* -KVM_EINVAL - the 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 6ec290b69b46..998878215078 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -119,4 +119,13 @@ struct kvmi_vcpu_set_xsave {
struct kvm_xsave xsave;
};
+struct kvmi_vcpu_get_mtrr_type {
+ __u64 gpa;
+};
+
+struct kvmi_vcpu_get_mtrr_type_reply {
+ __u8 type;
+ __u8 padding[7];
+};
+
#endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi_msg.c b/arch/x86/kvm/kvmi_msg.c
index c1b3bd56a42c..fc4ee6acce4a 100644
--- a/arch/x86/kvm/kvmi_msg.c
+++ b/arch/x86/kvm/kvmi_msg.c
@@ -233,10 +233,27 @@ static int handle_vcpu_set_xsave(const struct kvmi_vcpu_msg_job *job,
return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0);
}
+static int handle_vcpu_get_mtrr_type(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg,
+ const void *_req)
+{
+ const struct kvmi_vcpu_get_mtrr_type *req = _req;
+ struct kvmi_vcpu_get_mtrr_type_reply rpl;
+ gfn_t gfn;
+
+ gfn = gpa_to_gfn(req->gpa);
+
+ memset(&rpl, 0, sizeof(rpl));
+ rpl.type = kvm_mtrr_get_guest_memory_type(job->vcpu, gfn);
+
+ return kvmi_msg_vcpu_reply(job, msg, 0, &rpl, sizeof(rpl));
+}
+
static kvmi_vcpu_msg_job_fct const msg_vcpu[] = {
[KVMI_VCPU_CONTROL_CR] = handle_vcpu_control_cr,
[KVMI_VCPU_GET_CPUID] = handle_vcpu_get_cpuid,
[KVMI_VCPU_GET_INFO] = handle_vcpu_get_info,
+ [KVMI_VCPU_GET_MTRR_TYPE] = handle_vcpu_get_mtrr_type,
[KVMI_VCPU_GET_REGISTERS] = handle_vcpu_get_registers,
[KVMI_VCPU_GET_XCR] = handle_vcpu_get_xcr,
[KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave,
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index 3baf5c7842bb..8d7c6027f12c 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -47,6 +47,7 @@ enum {
KVMI_VCPU_GET_XCR = KVMI_VCPU_MESSAGE_ID(8),
KVMI_VCPU_GET_XSAVE = KVMI_VCPU_MESSAGE_ID(9),
KVMI_VCPU_SET_XSAVE = KVMI_VCPU_MESSAGE_ID(10),
+ KVMI_VCPU_GET_MTRR_TYPE = KVMI_VCPU_MESSAGE_ID(11),
KVMI_NEXT_VCPU_MESSAGE
};
diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
index 45c1f3132a3c..b0906c7fb954 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -1488,6 +1488,23 @@ static void test_cmd_vcpu_xsave(struct kvm_vm *vm)
cmd_vcpu_set_xsave(vm, &xsave);
}
+static void test_cmd_vcpu_get_mtrr_type(struct kvm_vm *vm)
+{
+ struct {
+ struct kvmi_msg_hdr hdr;
+ struct kvmi_vcpu_hdr vcpu_hdr;
+ struct kvmi_vcpu_get_mtrr_type cmd;
+ } req = {};
+ struct kvmi_vcpu_get_mtrr_type_reply rpl;
+
+ req.cmd.gpa = test_gpa;
+
+ test_vcpu0_command(vm, KVMI_VCPU_GET_MTRR_TYPE,
+ &req.hdr, sizeof(req), &rpl, sizeof(rpl), 0);
+
+ pr_debug("mtrr_type: gpa 0x%lx type 0x%x\n", test_gpa, rpl.type);
+}
+
static void test_introspection(struct kvm_vm *vm)
{
srandom(time(0));
@@ -1517,6 +1534,7 @@ static void test_introspection(struct kvm_vm *vm)
test_event_xsetbv(vm);
test_cmd_vcpu_get_xcr(vm);
test_cmd_vcpu_xsave(vm);
+ test_cmd_vcpu_get_mtrr_type(vm);
unhook_introspection(vm);
}
