This can be used by the introspection tool to emulate SSE instructions.
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virt/kvm/kvmi.rst | 28 +++++++++++++++++++
arch/x86/include/uapi/asm/kvmi.h | 4 +++
arch/x86/kvm/kvmi_msg.c | 21 ++++++++++++++
include/uapi/linux/kvmi.h | 1 +
.../testing/selftests/kvm/x86_64/kvmi_test.c | 27 ++++++++++++++----
5 files changed, 75 insertions(+), 6 deletions(-)
diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index c1ac47def4e9..56efeeb38980 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -859,6 +859,34 @@ Returns a buffer containing the XSAVE area.
* -KVM_EAGAIN - the selected vCPU can't be introspected yet
* -KVM_ENOMEM - there is not enough memory to allocate the reply
+20. KVMI_VCPU_SET_XSAVE
+-----------------------
+
+:Architectures: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+ struct kvmi_vcpu_set_xsave {
+ struct kvm_xsave xsave;
+ };
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+
+Modifies the XSAVE area.
+
+: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 0d3696c52d88..6ec290b69b46 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -115,4 +115,8 @@ struct kvmi_vcpu_get_xsave_reply {
struct kvm_xsave xsave;
};
+struct kvmi_vcpu_set_xsave {
+ struct kvm_xsave xsave;
+};
+
#endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi_msg.c b/arch/x86/kvm/kvmi_msg.c
index 77c753cd9705..c1b3bd56a42c 100644
--- a/arch/x86/kvm/kvmi_msg.c
+++ b/arch/x86/kvm/kvmi_msg.c
@@ -213,6 +213,26 @@ static int handle_vcpu_get_xsave(const struct kvmi_vcpu_msg_job *job,
return err;
}
+static int handle_vcpu_set_xsave(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg,
+ const void *req)
+{
+ size_t req_size, msg_size = msg->size;
+ int ec = 0;
+
+ if (check_sub_overflow(msg_size, sizeof(struct kvmi_vcpu_hdr),
+ &req_size))
+ return -EINVAL;
+
+ if (req_size < sizeof(struct kvm_xsave))
+ ec = -KVM_EINVAL;
+ else if (kvm_vcpu_ioctl_x86_set_xsave(job->vcpu,
+ (struct kvm_xsave *) req))
+ ec = -KVM_EINVAL;
+
+ return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0);
+}
+
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,
@@ -222,6 +242,7 @@ static kvmi_vcpu_msg_job_fct const msg_vcpu[] = {
[KVMI_VCPU_GET_XSAVE] = handle_vcpu_get_xsave,
[KVMI_VCPU_INJECT_EXCEPTION] = handle_vcpu_inject_exception,
[KVMI_VCPU_SET_REGISTERS] = handle_vcpu_set_registers,
+ [KVMI_VCPU_SET_XSAVE] = handle_vcpu_set_xsave,
};
kvmi_vcpu_msg_job_fct kvmi_arch_vcpu_msg_handler(u16 id)
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index e47c4ce0f8ed..3baf5c7842bb 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -46,6 +46,7 @@ enum {
KVMI_VCPU_INJECT_EXCEPTION = KVMI_VCPU_MESSAGE_ID(7),
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_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 277b1061410b..45c1f3132a3c 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -1448,21 +1448,35 @@ static void test_cmd_vcpu_get_xcr(struct kvm_vm *vm)
cmd_vcpu_get_xcr(vm, xcr1, &value, -KVM_EINVAL);
}
-static void cmd_vcpu_get_xsave(struct kvm_vm *vm)
+static void cmd_vcpu_get_xsave(struct kvm_vm *vm, struct kvm_xsave *rpl)
{
struct {
struct kvmi_msg_hdr hdr;
struct kvmi_vcpu_hdr vcpu_hdr;
} req = {};
- struct kvm_xsave rpl;
test_vcpu0_command(vm, KVMI_VCPU_GET_XSAVE, &req.hdr, sizeof(req),
- &rpl, sizeof(rpl), 0);
+ rpl, sizeof(*rpl), 0);
}
-static void test_cmd_vcpu_get_xsave(struct kvm_vm *vm)
+static void cmd_vcpu_set_xsave(struct kvm_vm *vm, struct kvm_xsave *rpl)
+{
+ struct {
+ struct kvmi_msg_hdr hdr;
+ struct kvmi_vcpu_hdr vcpu_hdr;
+ struct kvm_xsave xsave;
+ } req = {};
+
+ memcpy(&req.xsave, rpl, sizeof(*rpl));
+
+ test_vcpu0_command(vm, KVMI_VCPU_SET_XSAVE, &req.hdr, sizeof(req),
+ NULL, 0, 0);
+}
+
+static void test_cmd_vcpu_xsave(struct kvm_vm *vm)
{
struct kvm_cpuid_entry2 *entry;
+ struct kvm_xsave xsave;
entry = kvm_get_supported_cpuid_entry(1);
if (!(entry->ecx & X86_FEATURE_XSAVE)) {
@@ -1470,7 +1484,8 @@ static void test_cmd_vcpu_get_xsave(struct kvm_vm *vm)
return;
}
- cmd_vcpu_get_xsave(vm);
+ cmd_vcpu_get_xsave(vm, &xsave);
+ cmd_vcpu_set_xsave(vm, &xsave);
}
static void test_introspection(struct kvm_vm *vm)
@@ -1501,7 +1516,7 @@ 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);
+ test_cmd_vcpu_xsave(vm);
unhook_introspection(vm);
}
