On Thu, Jan 28, 2021 at 09:32:19PM +0300, Elena Afanasova wrote: > This patchset introduces a KVM dispatch mechanism which can be used > for handling MMIO/PIO accesses over file descriptors without returning > from ioctl(KVM_RUN). This allows device emulation to run in another task > separate from the vCPU task. > > This is achieved through KVM vm ioctl for registering MMIO/PIO regions and > a wire protocol that KVM uses to communicate with a task handling an > MMIO/PIO access. Hi Paolo, This patch series makes changes to the somewhat tricky x86 MMIO/PIO code and introduces a new ioctl(KVM_RUN) EINTR case. Please take a look if you have time! Reviews from anyone else are appreciated too! Thanks, Stefan > > TODOs: > * Implement KVM_EXIT_IOREGIONFD_FAILURE > * Add non-x86 arch support > * Add kvm-unittests > > Elena Afanasova (4): > KVM: add initial support for KVM_SET_IOREGION > KVM: x86: add support for ioregionfd signal handling > KVM: add support for ioregionfd cmds/replies serialization > KVM: enforce NR_IOBUS_DEVS limit if kmemcg is disabled > > arch/x86/kvm/Kconfig | 1 + > arch/x86/kvm/Makefile | 1 + > arch/x86/kvm/x86.c | 216 ++++++++++++++- > include/kvm/iodev.h | 14 + > include/linux/kvm_host.h | 34 +++ > include/uapi/linux/ioregion.h | 32 +++ > include/uapi/linux/kvm.h | 23 ++ > virt/kvm/Kconfig | 3 + > virt/kvm/eventfd.c | 25 ++ > virt/kvm/eventfd.h | 14 + > virt/kvm/ioregion.c | 479 ++++++++++++++++++++++++++++++++++ > virt/kvm/ioregion.h | 15 ++ > virt/kvm/kvm_main.c | 68 ++++- > 13 files changed, 905 insertions(+), 20 deletions(-) > create mode 100644 include/uapi/linux/ioregion.h > create mode 100644 virt/kvm/eventfd.h > create mode 100644 virt/kvm/ioregion.c > create mode 100644 virt/kvm/ioregion.h > > -- > 2.25.1 >
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