@@ -27,6 +27,7 @@ CTRL_SRCS-y += xc_csched2.c
CTRL_SRCS-y += xc_arinc653.c
CTRL_SRCS-y += xc_rt.c
CTRL_SRCS-y += xc_tbuf.c
+CTRL_SRCS-y += xc_vmtrace.c
CTRL_SRCS-y += xc_pm.c
CTRL_SRCS-y += xc_cpu_hotplug.c
CTRL_SRCS-y += xc_resume.c
@@ -1585,6 +1585,45 @@ int xc_tbuf_set_cpu_mask(xc_interface *xch, xc_cpumap_t mask);
int xc_tbuf_set_evt_mask(xc_interface *xch, uint32_t mask);
+/**
+ * Enable processor trace for given vCPU in given DomU.
+ * Allocate the trace ringbuffer with given size.
+ *
+ * @parm xch a handle to an open hypervisor interface
+ * @parm domid domain identifier
+ * @parm vcpu vcpu identifier
+ * @return 0 on success, -1 on failure
+ */
+int xc_vmtrace_pt_enable(xc_interface *xch, uint32_t domid,
+ uint32_t vcpu);
+
+/**
+ * Disable processor trace for given vCPU in given DomU.
+ * Deallocate the trace ringbuffer.
+ *
+ * @parm xch a handle to an open hypervisor interface
+ * @parm domid domain identifier
+ * @parm vcpu vcpu identifier
+ * @return 0 on success, -1 on failure
+ */
+int xc_vmtrace_pt_disable(xc_interface *xch, uint32_t domid,
+ uint32_t vcpu);
+
+/**
+ * Get current offset inside the trace ringbuffer.
+ * This allows to determine how much data was written into the buffer.
+ * Once buffer overflows, the offset will reset to 0 and the previous
+ * data will be overriden.
+ *
+ * @parm xch a handle to an open hypervisor interface
+ * @parm domid domain identifier
+ * @parm vcpu vcpu identifier
+ * @parm offset current offset inside trace buffer will be written there
+ * @return 0 on success, -1 on failure
+ */
+int xc_vmtrace_pt_get_offset(xc_interface *xch, uint32_t domid,
+ uint32_t vcpu, uint64_t *offset);
+
int xc_domctl(xc_interface *xch, struct xen_domctl *domctl);
int xc_sysctl(xc_interface *xch, struct xen_sysctl *sysctl);
new file mode 100644
@@ -0,0 +1,73 @@
+/******************************************************************************
+ * xc_vmtrace.c
+ *
+ * API for manipulating hardware tracing features
+ *
+ * Copyright (c) 2020, Michal Leszczynski
+ *
+ * Copyright 2020 CERT Polska. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "xc_private.h"
+#include <xen/trace.h>
+
+int xc_vmtrace_pt_enable(
+ xc_interface *xch, uint32_t domid, uint32_t vcpu)
+{
+ DECLARE_DOMCTL;
+ int rc;
+
+ domctl.cmd = XEN_DOMCTL_vmtrace_op;
+ domctl.domain = domid;
+ domctl.u.vmtrace_op.cmd = XEN_DOMCTL_vmtrace_pt_enable;
+ domctl.u.vmtrace_op.vcpu = vcpu;
+
+ rc = do_domctl(xch, &domctl);
+ return rc;
+}
+
+int xc_vmtrace_pt_get_offset(
+ xc_interface *xch, uint32_t domid, uint32_t vcpu, uint64_t *offset)
+{
+ DECLARE_DOMCTL;
+ int rc;
+
+ domctl.cmd = XEN_DOMCTL_vmtrace_op;
+ domctl.domain = domid;
+ domctl.u.vmtrace_op.cmd = XEN_DOMCTL_vmtrace_pt_get_offset;
+ domctl.u.vmtrace_op.vcpu = vcpu;
+
+ rc = do_domctl(xch, &domctl);
+ if ( !rc )
+ *offset = domctl.u.vmtrace_op.offset;
+ return rc;
+}
+
+int xc_vmtrace_pt_disable(xc_interface *xch, uint32_t domid, uint32_t vcpu)
+{
+ DECLARE_DOMCTL;
+ int rc;
+
+ domctl.cmd = XEN_DOMCTL_vmtrace_op;
+ domctl.domain = domid;
+ domctl.u.vmtrace_op.cmd = XEN_DOMCTL_vmtrace_pt_disable;
+ domctl.u.vmtrace_op.vcpu = vcpu;
+
+ rc = do_domctl(xch, &domctl);
+ return rc;
+}
+