公开(公告)号：US11544097B2

公开(公告)日：2023-01-03

申请号：US16807188

申请日：2020-03-03

Applicant: VMWARE, INC.

Inventor： Radu Rugina ,  Vivek Mohan Thampi

IPC: G06F9/455 ,  G06F13/20 ,  G06F13/42

Abstract: A method of migrating a virtual machine having a virtual device that is backed by direct passthrough hardware, from a source host to a destination host, includes the steps of determining whether or not the destination host has direct passthrough hardware that can back the virtual device, and upon determining that the destination host has direct passthrough hardware that can back the virtual device, determining if a version of the direct passthrough hardware at the source host matches a version of the direct passthrough hardware at the destination host. If the versions do not match, the steps further include quiescing the virtual device, deleting data structures relating to the virtual device, and then migrating the virtual machine from the source host to the destination host. If the versions match, the virtual machine is migrated without quiescing the virtual device and without deleting the data structures relating to the virtual device.

公开(公告)号：US11586567B2

公开(公告)日：2023-02-21

申请号：US16817653

申请日：2020-03-13

Applicant: VMWARE, INC.

Inventor： Radu Rugina ,  Vivek Mohan Thampi

IPC: G06F9/455 ,  G06F13/20 ,  G06F11/07

Abstract: A virtual machine (VM) has direct access to an I/O device having physical and virtual functions and a mailbox register, and includes a guest driver for controlling the virtual functions. The VM runs on system software that includes a physical driver for controlling the physical function (PF) and maintains VM page tables, which include an entry that references a memory space into which the mailbox register is mapped. The system software registers a callback function with the physical driver, which the physical driver invokes upon receiving a trigger for communication with the guest driver. In response, the system software alters the page tables so that access to the mailbox register causes a PF intercept, and the callback function handles the communication with the guest driver. After completion of the communication, the system software alters the page tables so that access to the mailbox register does not cause a PF intercept.

公开(公告)号：US20190146853A1

公开(公告)日：2019-05-16

申请号：US16223071

申请日：2018-12-17

Applicant: VMware, Inc.

Inventor： Xin Xu ,  Bryan Tan ,  Wei Xu ,  Tao Ren ,  Radu Rugina ,  Vivek Mohan Thampi

IPC: G06F9/50 ,  G06F13/16 ,  G06F13/42 ,  G06F9/455 ,  G06F13/28

Abstract: Techniques for enabling live migration of VMs with passthrough PCI devices are provided. In one set of embodiments, a hypervisor of a host system can create a copy of a DMA buffer used by a VM of the host system and a passthrough PCI device of the VM. The hypervisor can further designate one of the DMA buffer or the copy of the DMA buffer as a vCPU buffer that is accessible by the VM, and designate the other of the DMA buffer or the copy of the DMA buffer as a device buffer that is accessible by the passthrough PCI device. The hypervisor can then synchronize the vCPU buffer and the device buffer with each other as the VM and passthrough PCI device interact with their respective buffers, and as part of the synchronization can intercept DMA work requests submitted by the VM/completed by the passthrough PCI device.

公开(公告)号：US10198299B1

公开(公告)日：2019-02-05

申请号：US15798365

申请日：2017-10-30

Applicant: VMware, Inc.

Inventor： Xin Xu ,  Bryan Tan ,  Wei Xu ,  Tao Ren ,  Radu Rugina ,  Vivek Mohan Thampi

IPC: G06F9/50 ,  G06F13/28 ,  G06F13/16 ,  G06F13/42 ,  G06F9/455

Abstract: Techniques for enabling live migration of VMs with passthrough PCI devices are provided. In one set of embodiments, a hypervisor of a host system can create a copy of a DMA buffer used by a VM of the host system and a passthrough PCI device of the VM. The hypervisor can further designate one of the DMA buffer or the copy of the DMA buffer as a vCPU buffer that is accessible by the VM, and designate the other of the DMA buffer or the copy of the DMA buffer as a device buffer that is accessible by the passthrough PCI device. The hypervisor can then synchronize the vCPU buffer and the device buffer with each other as the VM and passthrough PCI device interact with their respective buffers, and as part of the synchronization can intercept DMA work requests submitted by the VM/completed by the passthrough PCI device.

公开(公告)号：US09678816B2

公开(公告)日：2017-06-13

申请号：US13848231

申请日：2013-03-21

Applicant: VMware, Inc.

Inventor： Radu Rugina ,  Vivek Mohan Thampi ,  Ricardo E. Gonzalez ,  Alok Kataria

IPC: G06F11/00 ,  G06F11/07 ,  G06F11/36

CPC classification number: G06F11/0712 ,  G06F11/0793 ,  G06F11/36 ,  G06F11/3644

Abstract: Probes are employed to inject errors into code. In response to a function-entry trigger event, a probe writes a predefined test value to a return value register. The probe then cause function execution to be skipped such that the test value is returned in lieu of the value which would otherwise be returned by the function. Behavior after the error is injected may then be observed, data collected, etc. such that undesired behavior (e.g., crashes) can be identified and/or corrected. In an alternative embodiment, the probe which is triggered may write a test value to a given memory address.

公开(公告)号：US11507415B2

公开(公告)日：2022-11-22

申请号：US16822054

申请日：2020-03-18

Applicant: VMWARE, INC.

Inventor： Vivek Mohan Thampi ,  Alok Nemchand Kataria ,  Martim Carbone ,  Deep Shah

IPC: G06F9/48 ,  G06F9/455 ,  G06F21/62 ,  G06F21/53

Abstract: Techniques for supporting invocations of the RDTSC (Read Time-Stamp Counter) instruction, or equivalents thereof, by guest program code running within a virtual machine (VM), including guest program code running within a secure hardware enclave of the VM, are provided. In one set of embodiments, a hypervisor can activate time virtualization heuristics for the VM, where the time virtualization heuristics cause accelerated delivery of system clock timer interrupts to a guest operating system (OS) of the VM. The hypervisor can further determine a scaling factor to be applied to timestamps generated by one or more physical CPUs, where the timestamps are generated in response to invocations of a CPU instruction made by guest program code running within the VM, and where the scaling factor is based on the activated time virtualization heuristics. The hypervisor can then program the scaling factor into the one or more physical CPUs.

公开(公告)号：US20210209040A1

公开(公告)日：2021-07-08

申请号：US16817653

申请日：2020-03-13

Applicant: VMWARE, INC.

Inventor： Radu Rugina ,  Vivek Mohan Thampi

IPC: G06F13/20 ,  G06F9/455 ,  G06F11/07

Abstract: A virtual machine (VM) has direct access to an I/O device having physical and virtual functions and a mailbox register, and includes a guest driver for controlling the virtual functions. The VM runs on system software that includes a physical driver for controlling the physical function (PF) and maintains VM page tables, which include an entry that references a memory space into which the mailbox register is mapped. The system software registers a callback function with the physical driver, which the physical driver invokes upon receiving a trigger for communication with the guest driver. In response, the system software alters the page tables so that access to the mailbox register causes a PF intercept, and the callback function handles the communication with the guest driver. After completion of the communication, the system software alters the page tables so that access to the mailbox register does not cause a PF intercept.