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From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: kvm@vger.kernel.org
Cc: "Adalbert Lazăr" <alazar@bitdefender.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v9 69/84] KVM: introspection: add KVMI_VCPU_GET_XCR
Date: Wed, 22 Jul 2020 00:09:07 +0300
Message-ID: <20200721210922.7646-70-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               | 33 ++++++++++++++++
 arch/x86/include/uapi/asm/kvmi.h              |  9 +++++
 arch/x86/kvm/kvmi.c                           | 17 +++++++++
 include/uapi/linux/kvmi.h                     |  2 +
 .../testing/selftests/kvm/x86_64/kvmi_test.c  | 38 +++++++++++++++++++
 virt/kvm/introspection/kvmi_int.h             |  3 ++
 virt/kvm/introspection/kvmi_msg.c             | 15 ++++++++
 7 files changed, 117 insertions(+)

diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index 283e9a2dfda1..1fdb73c6a6ff 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -809,6 +809,39 @@ Provides the maximum GFN allocated to the VM by walking through all
 memory slots allocated by KVM. Stricly speaking, the returned value refers
 to the first inaccessible GFN, next to the maximum accessible GFN.
 
+18. KVMI_VCPU_GET_XCR
+---------------------
+
+:Architecture: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+	struct kvmi_vcpu_hdr;
+	struct kvmi_vcpu_get_xcr {
+		__u8 xcr;
+		__u8 padding[7];
+	};
+
+:Returns:
+
+::
+
+        struct kvmi_error_code;
+	struct kvmi_vcpu_get_xcr_reply {
+		u64 value;
+	};
+
+Returns the value of an extended control register XCR.
+
+:Errors:
+
+* -KVM_EINVAL - the selected vCPU is invalid
+* -KVM_EINVAL - the specified control register is not XCR0
+* -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 2f69a4f5d2e0..cc4cb85366c8 100644
--- a/arch/x86/include/uapi/asm/kvmi.h
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -90,4 +90,13 @@ struct kvmi_event_xsetbv {
 	__u64 new_value;
 };
 
+struct kvmi_vcpu_get_xcr {
+	__u8 xcr;
+	__u8 padding[7];
+};
+
+struct kvmi_vcpu_get_xcr_reply {
+	u64 value;
+};
+
 #endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi.c b/arch/x86/kvm/kvmi.c
index 55c5e290730c..ff70c9a33ccf 100644
--- a/arch/x86/kvm/kvmi.c
+++ b/arch/x86/kvm/kvmi.c
@@ -720,3 +720,20 @@ void kvmi_xsetbv_event(struct kvm_vcpu *vcpu, u8 xcr,
 
 	kvmi_put(vcpu->kvm);
 }
+
+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 i;
+
+	for (i = 0; i < ARRAY_SIZE(req->padding); i++)
+		if (req->padding[i])
+			return -KVM_EINVAL;
+
+	if (req->xcr != 0)
+		return -KVM_EINVAL;
+
+	rpl->value = vcpu->arch.xcr0;
+	return 0;
+}
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index 348a9a551091..d1c564ff3d6c 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -39,6 +39,8 @@ enum {
 
 	KVMI_VM_GET_MAX_GFN = 17,
 
+	KVMI_VCPU_GET_XCR = 18,
+
 	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 0569185a7064..8b92ff7cee6b 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -1514,6 +1514,43 @@ static void test_event_xsetbv(struct kvm_vm *vm)
 	disable_vcpu_event(vm, event_id);
 }
 
+static void cmd_vcpu_get_xcr(struct kvm_vm *vm, u8 xcr, u64 *value,
+			     u8 padding, int expected_err)
+{
+	struct {
+		struct kvmi_msg_hdr hdr;
+		struct kvmi_vcpu_hdr vcpu_hdr;
+		struct kvmi_vcpu_get_xcr cmd;
+	} req = { 0 };
+	struct kvmi_vcpu_get_xcr_reply rpl = { 0 };
+	int r;
+
+	req.cmd.xcr = xcr;
+	req.cmd.padding[6] = padding;
+
+	r = do_vcpu0_command(vm, KVMI_VCPU_GET_XCR, &req.hdr, sizeof(req),
+			     &rpl, sizeof(rpl));
+
+	TEST_ASSERT(r == expected_err,
+		    "KVMI_VCPU_GET_XCR failed with error %d (%s), expected err %d\n",
+		    -r, kvm_strerror(-r), expected_err);
+
+	*value = r == 0 ? rpl.value : 0;
+}
+
+static void test_cmd_vcpu_get_xcr(struct kvm_vm *vm)
+{
+	u8 no_padding = 0, padding = 1;
+	u8 xcr0 = 0, xcr1 = 1;
+	u64 value;
+
+	cmd_vcpu_get_xcr(vm, xcr0, &value, no_padding, 0);
+	pr_info("XCR0 0x%lx\n", value);
+
+	cmd_vcpu_get_xcr(vm, xcr0, &value, padding, -KVM_EINVAL);
+	cmd_vcpu_get_xcr(vm, xcr1, &value, no_padding, -KVM_EINVAL);
+}
+
 static void test_introspection(struct kvm_vm *vm)
 {
 	srandom(time(0));
@@ -1541,6 +1578,7 @@ static void test_introspection(struct kvm_vm *vm)
 	test_cmd_vcpu_inject_exception(vm);
 	test_cmd_vm_get_max_gfn();
 	test_event_xsetbv(vm);
+	test_cmd_vcpu_get_xcr(vm);
 
 	unhook_introspection(vm);
 }
diff --git a/virt/kvm/introspection/kvmi_int.h b/virt/kvm/introspection/kvmi_int.h
index 51c03097a7d5..0b84ac365ae7 100644
--- a/virt/kvm/introspection/kvmi_int.h
+++ b/virt/kvm/introspection/kvmi_int.h
@@ -105,5 +105,8 @@ int kvmi_arch_cmd_vcpu_inject_exception(struct kvm_vcpu *vcpu, u8 vector,
 					u32 error_code, u64 address);
 void kvmi_arch_send_trap_event(struct kvm_vcpu *vcpu);
 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);
 
 #endif
diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c
index 18bc1a711845..aa4fb202115e 100644
--- a/virt/kvm/introspection/kvmi_msg.c
+++ b/virt/kvm/introspection/kvmi_msg.c
@@ -524,6 +524,20 @@ static int handle_vcpu_inject_exception(const struct kvmi_vcpu_msg_job *job,
 	return kvmi_msg_vcpu_reply(job, msg, ec, NULL, 0);
 }
 
+static int handle_vcpu_get_xcr(const struct kvmi_vcpu_msg_job *job,
+			       const struct kvmi_msg_hdr *msg,
+			       const void *req)
+{
+	struct kvmi_vcpu_get_xcr_reply rpl;
+	int ec;
+
+	memset(&rpl, 0, sizeof(rpl));
+
+	ec = kvmi_arch_cmd_vcpu_get_xcr(job->vcpu, req, &rpl);
+
+	return kvmi_msg_vcpu_reply(job, msg, ec, &rpl, sizeof(rpl));
+}
+
 /*
  * These functions are executed from the vCPU thread. The receiving thread
  * passes the messages using a newly allocated 'struct kvmi_vcpu_msg_job'
@@ -538,6 +552,7 @@ static int(*const msg_vcpu[])(const struct kvmi_vcpu_msg_job *,
 	[KVMI_VCPU_GET_CPUID]        = handle_vcpu_get_cpuid,
 	[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_INJECT_EXCEPTION] = handle_vcpu_inject_exception,
 	[KVMI_VCPU_SET_REGISTERS]    = handle_vcpu_set_registers,
 };
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  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 ` Adalbert Lazăr [this message]
2020-07-22  8:25   ` [PATCH v9 69/84] KVM: introspection: add KVMI_VCPU_GET_XCR 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 ` [PATCH v9 71/84] KVM: introspection: add KVMI_VCPU_SET_XSAVE Adalbert Lazăr
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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