From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This vCPU command is used to get the XSAVE area.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Co-developed-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virt/kvm/kvmi.rst | 31 +++++++++++++++++++
arch/x86/include/uapi/asm/kvmi.h | 4 +++
arch/x86/kvm/kvmi.c | 24 ++++++++++++++
include/uapi/linux/kvmi.h | 1 +
.../testing/selftests/kvm/x86_64/kvmi_test.c | 30 ++++++++++++++++++
virt/kvm/introspection/kvmi_int.h | 3 ++
virt/kvm/introspection/kvmi_msg.c | 16 ++++++++++
7 files changed, 109 insertions(+)
diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index 1fdb73c6a6ff..9bf8b08eb585 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -842,6 +842,37 @@ Returns the value of an extended control register XCR.
* -KVM_EINVAL - the padding is not zero
* -KVM_EAGAIN - the selected vCPU can't be introspected yet
+19. KVMI_VCPU_GET_XSAVE
+-----------------------
+
+:Architecture: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+ struct kvmi_vcpu_get_xsave_reply {
+ __u32 region[0];
+ };
+
+Returns a buffer containing the XSAVE area. Currently, the size of
+``kvm_xsave`` is used, but it could change. The userspace should get
+the buffer size from the message size (kvmi_msg_hdr.size).
+
+: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
+* -KVM_ENOMEM - there is not enough memory to allocate the reply
+
Events
======
diff --git a/arch/x86/include/uapi/asm/kvmi.h b/arch/x86/include/uapi/asm/kvmi.h
index cc4cb85366c8..a165c259ba0e 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -99,4 +99,8 @@ struct kvmi_vcpu_get_xcr_reply {
u64 value;
};
+struct kvmi_vcpu_get_xsave_reply {
+ __u32 region[0];
+};
+
#endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index ff70c9a33ccf..7b7122784f0f 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -737,3 +737,27 @@ int kvmi_arch_cmd_vcpu_get_xcr(struct kvm_vcpu *vcpu,
rpl->value = vcpu->arch.xcr0;
return 0;
}
+
+int kvmi_arch_cmd_vcpu_get_xsave(struct kvm_vcpu *vcpu,
+ struct kvmi_vcpu_get_xsave_reply **dest,
+ size_t *dest_size)
+{
+ struct kvmi_vcpu_get_xsave_reply *rpl = NULL;
+ size_t rpl_size = sizeof(*rpl) + sizeof(struct kvm_xsave);
+ struct kvm_xsave *area;
+
+ if (!valid_reply_size(rpl_size))
+ return -KVM_EINVAL;
+
+ rpl = kvmi_msg_alloc();
+ if (!rpl)
+ return -KVM_ENOMEM;
+
+ area = (struct kvm_xsave *) &rpl->region[0];
+ kvm_vcpu_ioctl_x86_get_xsave(vcpu, area);
+
+ *dest = rpl;
+ *dest_size = rpl_size;
+
+ return 0;
+}
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index d1c564ff3d6c..6b5662f54ba1 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -40,6 +40,7 @@ enum {
KVMI_VM_GET_MAX_GFN = 17,
KVMI_VCPU_GET_XCR = 18,
+ KVMI_VCPU_GET_XSAVE = 19,
KVMI_NUM_MESSAGES
};
diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
index 8b92ff7cee6b..657684ec6ff5 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -1551,6 +1551,35 @@ static void test_cmd_vcpu_get_xcr(struct kvm_vm *vm)
cmd_vcpu_get_xcr(vm, xcr1, &value, no_padding, -KVM_EINVAL);
}
+static void cmd_vcpu_get_xsave(struct kvm_vm *vm)
+{
+ struct {
+ struct kvmi_msg_hdr hdr;
+ struct kvmi_vcpu_hdr vcpu_hdr;
+ } req = {};
+ struct kvm_xsave rpl;
+ int r;
+
+ r = do_vcpu0_command(vm, KVMI_VCPU_GET_XSAVE, &req.hdr, sizeof(req),
+ &rpl, sizeof(rpl));
+ TEST_ASSERT(r == 0,
+ "KVMI_VCPU_GET_XSAVE failed with error %d (%s)\n",
+ -r, kvm_strerror(-r));
+}
+
+static void test_cmd_vcpu_get_xsave(struct kvm_vm *vm)
+{
+ struct kvm_cpuid_entry2 *entry;
+
+ entry = kvm_get_supported_cpuid_entry(1);
+ if (!(entry->ecx & X86_FEATURE_XSAVE)) {
+ print_skip("XSAVE not supported, ecx 0x%x", entry->ecx);
+ return;
+ }
+
+ cmd_vcpu_get_xsave(vm);
+}
+
static void test_introspection(struct kvm_vm *vm)
{
srandom(time(0));
@@ -1579,6 +1608,7 @@ static void test_introspection(struct kvm_vm *vm)
test_cmd_vm_get_max_gfn();
test_event_xsetbv(vm);
test_cmd_vcpu_get_xcr(vm);
+ test_cmd_vcpu_get_xsave(vm);
unhook_introspection(vm);
}
diff --git a/virt/kvm/introspection/kvmi_int.h b/virt/kvm/introspection/kvmi_int.h
index 0b84ac365ae7..26fc27f3fddc 100644
--- a/virt/kvm/introspection/kvmi_int.h
+++ b/virt/kvm/introspection/kvmi_int.h
@@ -108,5 +108,8 @@ void kvmi_arch_inject_exception(struct kvm_vcpu *vcpu);
int kvmi_arch_cmd_vcpu_get_xcr(struct kvm_vcpu *vcpu,
const struct kvmi_vcpu_get_xcr *req,
struct kvmi_vcpu_get_xcr_reply *rpl);
+int kvmi_arch_cmd_vcpu_get_xsave(struct kvm_vcpu *vcpu,
+ struct kvmi_vcpu_get_xsave_reply **dest,
+ size_t *dest_size);
#endif
diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c
index aa4fb202115e..06a8fbb5c86d 100644
--- a/virt/kvm/introspection/kvmi_msg.c
+++ b/virt/kvm/introspection/kvmi_msg.c
@@ -538,6 +538,21 @@ static int handle_vcpu_get_xcr(const struct kvmi_vcpu_msg_job *job,
return kvmi_msg_vcpu_reply(job, msg, ec, &rpl, sizeof(rpl));
}
+static int handle_vcpu_get_xsave(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg,
+ const void *req)
+{
+ struct kvmi_vcpu_get_xsave_reply *rpl = NULL;
+ size_t rpl_size = 0;
+ int err, ec;
+
+ ec = kvmi_arch_cmd_vcpu_get_xsave(job->vcpu, &rpl, &rpl_size);
+
+ err = kvmi_msg_vcpu_reply(job, msg, ec, rpl, rpl_size);
+ kvmi_msg_free(rpl);
+ return err;
+}
+
/*
* These functions are executed from the vCPU thread. The receiving thread
* passes the messages using a newly allocated 'struct kvmi_vcpu_msg_job'
@@ -553,6 +568,7 @@ static int(*const msg_vcpu[])(const struct kvmi_vcpu_msg_job *,
[KVMI_VCPU_GET_INFO] = handle_vcpu_get_info,
[KVMI_VCPU_GET_REGISTERS] = handle_vcpu_get_registers,
[KVMI_VCPU_GET_XCR] = handle_vcpu_get_xcr,
+ [KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave,
[KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception,
[KVMI_VCPU_SET_REGISTERS] = handle_vcpu_set_registers,
};
