Abstract: Systems and methods for managing message signaled interrupts in virtualized computer systems. An example method may comprise: intercepting, by a hypervisor running on a host computer system, a memory read operation initiated by a virtual machine with respect to a first interrupt mapping table, the first interrupt mapping table stored by a physical device associated with the virtual machine, the memory read operation specifying an offset relative to a base address of the first interrupt mapping table; reading at least part of the first interrupt mapping table; and returning, to the virtual machine, a value referenced by the offset within a second interrupt mapping table, the second interrupt mapping table residing in a memory of the host computer system.

Abstract: Systems and methods for managing message signaled interrupts in virtualized computer systems. An example method may comprise: intercepting, by a hypervisor running on a host computer system, a memory read operation initiated by a virtual machine with respect to a first interrupt mapping table, the first interrupt mapping table stored by a physical device associated with the virtual machine, the memory read operation specifying an offset relative to a base address of the first interrupt mapping table; reading at least part of the first interrupt mapping table; and returning, to the virtual machine, a value referenced by the offset within a second interrupt mapping table, the second interrupt mapping table residing in a memory of the host computer system.

Abstract: Methods and systems for managing a removal of a passthrough device from a guest managed by a hypervisor in virtualized computing environment. A hypervisor receives a request from the guest for access to a passthrough device. The hypervisor sets, in a memory, a last accessed state associated with a virtual machine executing the guest. The hypervisor forwards the request to the passthrough device and configures the host CPU to send a subsequent access request directly to the passthrough device. In response to a virtual machine reset, the hypervisor clears the last accessed state and instructs the host CPU to send a post-reset access request to the hypervisor.

Abstract: Methods and systems for managing a removal of a device from a guest managed by a hypervisor in virtualized computing environment. A hypervisor maintains in a memory a last accessed state associated with a virtual machine executing a guest. The last accessed state is cleared by the hypervisor when the virtual machine is reset and the last accessed state is set when the hypervisor receives a request from the guest to access a device. The hypervisor receives a request to remove the device from the guest of the virtual machine and remove the device from the guest when the last accessed state is clear.

Abstract: Methods and systems for managing a removal of a passthrough device from a guest managed by a hypervisor in virtualized computing environment. A hypervisor receives a request from the guest for access to a passthrough device. The hypervisor sets, in a memory, a last accessed state associated with a virtual machine executing the guest. The hypervisor forwards the request to the passthrough device and configures the host CPU to send a subsequent access request directly to the passthrough device. In response to a virtual machine reset, the hypervisor clears the last accessed state and instructs the host CPU to send a post-reset access request to the hypervisor.

Abstract: Methods and systems for managing a removal of a device from a guest managed by a hypervisor in virtualized computing environment. A hypervisor maintains in a memory a last accessed state associated with a virtual machine executing a guest. The last accessed state is cleared by the hypervisor when the virtual machine is reset and the last accessed state is set when the hypervisor receives a request from the guest to access a device. The hypervisor receives a request to remove the device from the guest of the virtual machine and remove the device from the guest when the last accessed state is clear.