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From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: kvm@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Adalbert Lazăr" <alazar@bitdefender.com>
Subject: [PATCH v9 71/84] KVM: introspection: add KVMI_VCPU_SET_XSAVE
Date: Wed, 22 Jul 2020 00:09:09 +0300
Message-ID: <20200721210922.7646-72-alazar@bitdefender.com> (raw)
In-Reply-To: <20200721210922.7646-1-alazar@bitdefender.com>

This can be used by the introspection tool to emulate SSE instructions.

Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 Documentation/virt/kvm/kvmi.rst               | 29 +++++++++++++++++
 arch/x86/include/uapi/asm/kvmi.h              |  4 +++
 arch/x86/kvm/kvmi.c                           | 23 ++++++++++++++
 include/uapi/linux/kvmi.h                     |  1 +
 .../testing/selftests/kvm/x86_64/kvmi_test.c  | 31 +++++++++++++++----
 virt/kvm/introspection/kvmi_int.h             |  3 ++
 virt/kvm/introspection/kvmi_msg.c             | 17 ++++++++++
 7 files changed, 102 insertions(+), 6 deletions(-)

diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index 9bf8b08eb585..24605aaede9a 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -873,6 +873,35 @@ the buffer size from the message size (kvmi_msg_hdr.size).
 * -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
+-----------------------
+
+:Architecture: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+	struct kvmi_vcpu_hdr;
+	struct kvmi_vcpu_set_xsave {
+		__u32 region[0];
+	};
+
+:Returns:
+
+::
+
+	struct kvmi_error_code;
+
+Modifies the XSAVE area.
+
+:Errors:
+
+* -KVM_EINVAL - the buffer is larger than ``struct kvm_xsave``
+* -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 a165c259ba0e..71206206973c 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -103,4 +103,8 @@ struct kvmi_vcpu_get_xsave_reply {
 	__u32 region[0];
 };
 
+struct kvmi_vcpu_set_xsave {
+	__u32 region[0];
+};
+
 #endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index 7b7122784f0f..0776be48ada1 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -761,3 +761,26 @@ int kvmi_arch_cmd_vcpu_get_xsave(struct kvm_vcpu *vcpu,
 
 	return 0;
 }
+
+int kvmi_arch_cmd_vcpu_set_xsave(struct kvm_vcpu *vcpu,
+				 const struct kvmi_vcpu_set_xsave *req,
+				 size_t req_size)
+{
+	struct kvm_xsave *area;
+	size_t dest_size = sizeof(*area);
+	int err;
+
+	if (req_size > dest_size)
+		return -KVM_EINVAL;
+
+	area = kzalloc(dest_size, GFP_KERNEL);
+	if (!area)
+		return -KVM_ENOMEM;
+
+	memcpy(area, req, min(req_size, dest_size));
+
+	err = kvm_vcpu_ioctl_x86_set_xsave(vcpu, area);
+	kfree(area);
+
+	return err ? -KVM_EINVAL : 0;
+}
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index 6b5662f54ba1..441586cec238 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -41,6 +41,7 @@ enum {
 
 	KVMI_VCPU_GET_XCR = 18,
 	KVMI_VCPU_GET_XSAVE = 19,
+	KVMI_VCPU_SET_XSAVE = 20,
 
 	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 657684ec6ff5..30741983a3ab 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -1551,25 +1551,43 @@ 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)
+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;
 	int r;
 
 	r = do_vcpu0_command(vm, KVMI_VCPU_GET_XSAVE, &req.hdr, sizeof(req),
-			     &rpl, sizeof(rpl));
+			     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)
+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 = {};
+	int r;
+
+	memcpy(&req.xsave, rpl, sizeof(*rpl));
+
+	r = do_vcpu0_command(vm, KVMI_VCPU_SET_XSAVE, &req.hdr, sizeof(req),
+			     NULL, 0);
+	TEST_ASSERT(r == 0,
+		    "KVMI_VCPU_SET_XSAVE failed with error %d (%s)\n",
+		    -r, kvm_strerror(-r));
+}
+
+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)) {
@@ -1577,7 +1595,8 @@ 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)
@@ -1608,7 +1627,7 @@ 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);
 }
diff --git a/virt/kvm/introspection/kvmi_int.h b/virt/kvm/introspection/kvmi_int.h
index 26fc27f3fddc..f358ef1c0c73 100644
--- a/virt/kvm/introspection/kvmi_int.h
+++ b/virt/kvm/introspection/kvmi_int.h
@@ -111,5 +111,8 @@ int kvmi_arch_cmd_vcpu_get_xcr(struct kvm_vcpu *vcpu,
 int kvmi_arch_cmd_vcpu_get_xsave(struct kvm_vcpu *vcpu,
 				 struct kvmi_vcpu_get_xsave_reply **dest,
 				 size_t *dest_size);
+int kvmi_arch_cmd_vcpu_set_xsave(struct kvm_vcpu *vcpu,
+				 const struct kvmi_vcpu_set_xsave *req,
+				 size_t req_size);
 
 #endif
diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c
index 06a8fbb5c86d..c8fe55c3d5c7 100644
--- a/virt/kvm/introspection/kvmi_msg.c
+++ b/virt/kvm/introspection/kvmi_msg.c
@@ -553,6 +553,22 @@ 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 msg_size = msg->size, xsave_size;
+	int ec;
+
+	if (check_sub_overflow(msg_size, sizeof(struct kvmi_vcpu_hdr),
+				&xsave_size))
+		return -EINVAL;
+
+	ec = kvmi_arch_cmd_vcpu_set_xsave(job->vcpu, req, xsave_size);
+
+	return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0);
+}
+
 /*
  * These functions are executed from the vCPU thread. The receiving thread
  * passes the messages using a newly allocated 'struct kvmi_vcpu_msg_job'
@@ -571,6 +587,7 @@ static int(*const msg_vcpu[])(const struct kvmi_vcpu_msg_job *,
 	[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,
 };
 
 static bool is_vcpu_command(u16 id)

  parent reply index

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 21:07 [PATCH v9 00/84] VM introspection Adalbert Lazăr
2020-07-21 21:07 ` [PATCH v9 01/84] signal: export kill_pid_info() Adalbert Lazăr
2020-07-22  6:36   ` Christoph Hellwig
2020-07-21 21:08 ` [PATCH v9 02/84] KVM: UAPI: add error codes used by the VM introspection code Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 03/84] KVM: add kvm_vcpu_kick_and_wait() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 04/84] KVM: add kvm_get_max_gfn() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 05/84] KVM: doc: fix the hypercall numbering Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 06/84] KVM: x86: add kvm_arch_vcpu_get_regs() and kvm_arch_vcpu_get_sregs() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 07/84] KVM: x86: add kvm_arch_vcpu_set_regs() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 08/84] KVM: x86: avoid injecting #PF when emulate the VMCALL instruction Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 09/84] KVM: x86: add .bp_intercepted() to struct kvm_x86_ops Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 10/84] KVM: x86: add .control_cr3_intercept() " Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 11/84] KVM: x86: add .cr3_write_intercepted() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 12/84] KVM: x86: add .desc_ctrl_supported() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 13/84] KVM: svm: add support for descriptor-table exits Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 14/84] KVM: x86: add .control_desc_intercept() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 15/84] KVM: x86: add .desc_intercepted() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 16/84] KVM: x86: export .msr_write_intercepted() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 17/84] KVM: x86: use MSR_TYPE_R, MSR_TYPE_W and MSR_TYPE_RW with AMD Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 18/84] KVM: svm: pass struct kvm_vcpu to set_msr_interception() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 19/84] KVM: vmx: pass struct kvm_vcpu to the intercept msr related functions Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 20/84] KVM: x86: add .control_msr_intercept() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 21/84] KVM: x86: vmx: use a symbolic constant when checking the exit qualifications Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 22/84] KVM: x86: save the error code during EPT/NPF exits handling Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 23/84] KVM: x86: add .fault_gla() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 24/84] KVM: x86: add .spt_fault() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 25/84] KVM: x86: add .gpt_translation_fault() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 26/84] KVM: x86: add .control_singlestep() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 27/84] KVM: x86: export kvm_arch_vcpu_set_guest_debug() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 28/84] KVM: x86: extend kvm_mmu_gva_to_gpa_system() with the 'access' parameter Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 29/84] KVM: x86: export kvm_inject_pending_exception() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 30/84] KVM: x86: export kvm_vcpu_ioctl_x86_get_xsave() Adalbert Lazăr
2020-07-22  1:31   ` kernel test robot
2020-07-21 21:08 ` [PATCH v9 31/84] KVM: x86: export kvm_vcpu_ioctl_x86_set_xsave() Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 32/84] KVM: x86: page track: provide all callbacks with the guest virtual address Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 33/84] KVM: x86: page track: add track_create_slot() callback Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 34/84] KVM: x86: page_track: add support for preread, prewrite and preexec Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 35/84] KVM: x86: wire in the preread/prewrite/preexec page trackers Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 36/84] KVM: x86: disable gpa_available optimization for fetch and page-walk SPT violations Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 37/84] KVM: introduce VM introspection Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 38/84] KVM: introspection: add hook/unhook ioctls Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 39/84] KVM: introspection: add permission access ioctls Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 40/84] KVM: introspection: add the read/dispatch message function Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 41/84] KVM: introspection: add KVMI_GET_VERSION Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 42/84] KVM: introspection: add KVMI_VM_CHECK_COMMAND and KVMI_VM_CHECK_EVENT Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 43/84] KVM: introspection: add KVMI_VM_GET_INFO Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 44/84] KVM: introspection: add KVMI_EVENT_UNHOOK Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 45/84] KVM: introspection: add KVMI_VM_CONTROL_EVENTS Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 46/84] KVM: introspection: add KVMI_VM_READ_PHYSICAL/KVMI_VM_WRITE_PHYSICAL Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 47/84] KVM: introspection: add vCPU related data Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 48/84] KVM: introspection: add a jobs list to every introspected vCPU Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 49/84] KVM: introspection: handle vCPU introspection requests Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 50/84] KVM: introspection: handle vCPU commands Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 51/84] KVM: introspection: add KVMI_VCPU_GET_INFO Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 52/84] KVM: introspection: add KVMI_VCPU_PAUSE Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 53/84] KVM: introspection: add KVMI_EVENT_PAUSE_VCPU Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 54/84] KVM: introspection: add the crash action handling on the event reply Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 55/84] KVM: introspection: add KVMI_VCPU_CONTROL_EVENTS Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 56/84] KVM: introspection: add KVMI_VCPU_GET_REGISTERS Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 57/84] KVM: introspection: add KVMI_VCPU_SET_REGISTERS Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 58/84] KVM: introspection: add KVMI_VCPU_GET_CPUID Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 59/84] KVM: introspection: add KVMI_EVENT_HYPERCALL Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 60/84] KVM: introspection: add KVMI_EVENT_BREAKPOINT Adalbert Lazăr
2020-07-21 21:08 ` [PATCH v9 61/84] KVM: introspection: add cleanup support for vCPUs Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 62/84] KVM: introspection: restore the state of #BP interception on unhook Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 63/84] KVM: introspection: add KVMI_VM_CONTROL_CLEANUP Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 64/84] KVM: introspection: add KVMI_VCPU_CONTROL_CR and KVMI_EVENT_CR Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 65/84] KVM: introspection: restore the state of CR3 interception on unhook Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 66/84] KVM: introspection: add KVMI_VCPU_INJECT_EXCEPTION + KVMI_EVENT_TRAP Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 67/84] KVM: introspection: add KVMI_VM_GET_MAX_GFN Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 68/84] KVM: introspection: add KVMI_EVENT_XSETBV Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 69/84] KVM: introspection: add KVMI_VCPU_GET_XCR Adalbert Lazăr
2020-07-22  8:25   ` kernel test robot
2020-07-21 21:09 ` [PATCH v9 70/84] KVM: introspection: add KVMI_VCPU_GET_XSAVE Adalbert Lazăr
2020-07-21 21:09 ` Adalbert Lazăr [this message]
2020-07-21 21:09 ` [PATCH v9 72/84] KVM: introspection: add KVMI_VCPU_GET_MTRR_TYPE Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 73/84] KVM: introspection: add KVMI_EVENT_DESCRIPTOR Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 74/84] KVM: introspection: restore the state of descriptor-table register interception on unhook Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 75/84] KVM: introspection: add KVMI_VCPU_CONTROL_MSR and KVMI_EVENT_MSR Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 76/84] KVM: introspection: restore the state of MSR interception on unhook Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 77/84] KVM: introspection: add KVMI_VM_SET_PAGE_ACCESS Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 78/84] KVM: introspection: add KVMI_EVENT_PF Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 79/84] KVM: introspection: extend KVMI_GET_VERSION with struct kvmi_features Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 80/84] KVM: introspection: add KVMI_VCPU_CONTROL_SINGLESTEP Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 81/84] KVM: introspection: add KVMI_EVENT_SINGLESTEP Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 82/84] KVM: introspection: add KVMI_VCPU_TRANSLATE_GVA Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 83/84] KVM: introspection: emulate a guest page table walk on SPT violations due to A/D bit updates Adalbert Lazăr
2020-07-21 21:09 ` [PATCH v9 84/84] KVM: x86: call the page tracking code on emulation failure Adalbert Lazăr

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