John Baldwin fc276d92ae Add a way to temporarily suspend and resume virtual CPUs. ... This is used as part of implementing run control in bhyve's debug server. The hypervisor now maintains a set of "debugged" CPUs. Attempting to run a debugged CPU will fail to execute any guest instructions and will instead report a VM_EXITCODE_DEBUG exit to the userland hypervisor. Virtual CPUs are placed into the debugged state via vm_suspend_cpu() (implemented via a new VM_SUSPEND_CPU ioctl). Virtual CPUs can be resumed via vm_resume_cpu() (VM_RESUME_CPU ioctl). The debug server suspends virtual CPUs when it wishes them to stop executing in the guest (for example, when a debugger attaches to the server). The debug server can choose to resume only a subset of CPUs (for example, when single stepping) or it can choose to resume all CPUs. The debug server must explicitly mark a CPU as resumed via vm_resume_cpu() before the virtual CPU will successfully execute any guest instructions. Reviewed by: avg, grehan Tested on: Intel (jhb), AMD (avg) Differential Revision: https://reviews.freebsd.org/D14466		2018-04-06 22:03:43 +00:00
..
Makefile	First pass through library packaging.	2016-02-04 21:16:35 +00:00
Makefile.depend	DIRDEPS_BUILD: Update dependencies.	2017-10-31 00:07:04 +00:00
vmmapi.c	Add a way to temporarily suspend and resume virtual CPUs.	2018-04-06 22:03:43 +00:00
vmmapi.h	Add a way to temporarily suspend and resume virtual CPUs.	2018-04-06 22:03:43 +00:00
vmmapi_freebsd.c	lib: further adoption of SPDX licensing ID tags.	2017-11-26 02:00:33 +00:00