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2021-02-10multi-process: perform device reset in the remote processElena Ufimtseva
Perform device reset in the remote process when QEMU performs device reset. This is required to reset the internal state (like registers, etc...) of emulated devices Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 7cb220a51f565dc0817bd76e2f540e89c2d2b850.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: Retrieve PCI info from remote processJagannathan Raman
Retrieve PCI configuration info about the remote device and configure the Proxy PCI object based on the returned information Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 85ee367bbb993aa23699b44cfedd83b4ea6d5221.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: create IOHUB object to handle irqJagannathan Raman
IOHUB object is added to manage PCI IRQs. It uses KVM_IRQFD ioctl to create irqfd to injecting PCI interrupts to the guest. IOHUB object forwards the irqfd to the remote process. Remote process uses this fd to directly send interrupts to the guest, bypassing QEMU. Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 51d5c3d54e28a68b002e3875c59599c9f5a424a1.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: Synchronize remote memoryJagannathan Raman
Add ProxyMemoryListener object which is used to keep the view of the RAM in sync between QEMU and remote process. A MemoryListener is registered for system-memory AddressSpace. The listener sends SYNC_SYSMEM message to the remote process when memory listener commits the changes to memory, the remote process receives the message and processes it in the handler for SYNC_SYSMEM message. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 04fe4e6a9ca90d4f11ab6f59be7652f5b086a071.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: PCI BAR read/write handling for proxy & remote endpointsJagannathan Raman
Proxy device object implements handler for PCI BAR writes and reads. The handler uses BAR_WRITE/BAR_READ message to communicate to the remote process with the BAR address and value to be written/read. The remote process implements handler for BAR_WRITE/BAR_READ message. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: a8b76714a9688be5552c4c92d089bc9e8a4707ff.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: Forward PCI config space acceses to the remote processElena Ufimtseva
The Proxy Object sends the PCI config space accesses as messages to the remote process over the communication channel Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: d3c94f4618813234655356c60e6f0d0362ff42d6.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: add proxy communication functionsElena Ufimtseva
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: d54edb4176361eed86b903e8f27058363b6c83b3.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: introduce proxy objectElena Ufimtseva
Defines a PCI Device proxy object as a child of TYPE_PCI_DEVICE. Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: b5186ebfedf8e557044d09a768846c59230ad3a7.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: setup memory manager for remote deviceJagannathan Raman
SyncSysMemMsg message format is defined. It is used to send file descriptors of the RAM regions to remote device. RAM on the remote device is configured with a set of file descriptors. Old RAM regions are deleted and new regions, each with an fd, is added to the RAM. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 7d2d1831d812e85f681e7a8ab99e032cf4704689.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: Associate fd of a PCIDevice with its objectJagannathan Raman
Associate the file descriptor for a PCIDevice in remote process with DeviceState object. Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: f405a2ed5d7518b87bea7c59cfdf334d67e5ee51.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: Initialize message handler in remote deviceJagannathan Raman
Initializes the message handler function in the remote process. It is called whenever there's an event pending on QIOChannel that registers this function. Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 99d38d8b93753a6409ac2340e858858cda59ab1b.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: define MPQemuMsg format and transmission functionsElena Ufimtseva
Defines MPQemuMsg, which is the message that is sent to the remote process. This message is sent over QIOChannel and is used to command the remote process to perform various tasks. Define transmission functions used by proxy and by remote. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 56ca8bcf95195b2b195b08f6b9565b6d7410bce5.1611938319.git.jag.raman@oracle.com [Replace struct iovec send[2] = {0} with {} to make clang happy as suggested by Peter Maydell <peter.maydell@linaro.org>. --Stefan] Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: setup a machine object for remote device processJagannathan Raman
x-remote-machine object sets up various subsystems of the remote device process. Instantiate PCI host bridge object and initialize RAM, IO & PCI memory regions. Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: c537f38d17f90453ca610c6b70cf3480274e0ba1.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10multi-process: setup PCI host bridge for remote deviceJagannathan Raman
PCI host bridge is setup for the remote device process. It is implemented using remote-pcihost object. It is an extension of the PCI host bridge setup by QEMU. Remote-pcihost configures a PCI bus which could be used by the remote PCI device to latch on to. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 0871ba857abb2eafacde07e7fe66a3f12415bfb2.1611938319.git.jag.raman@oracle.com [Added PCI_EXPRESS condition in hw/remote/Kconfig since remote-pcihost needs PCIe. This solves "make check" failure on s390x. Fix suggested by Philippe Mathieu-Daudé <philmd@redhat.com> and Thomas Huth <thuth@redhat.com>. --Stefan] Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-09multi-process: Add config option for multi-process QEMUJagannathan Raman
Add configuration options to enable or disable multiprocess QEMU code Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 6cc37253e35418ebd7b675a31a3df6e3c7a12dc1.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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