On 8/16/21 3:25 PM, Ashish Kalra wrote: > From: Ashish Kalra <ashish.kalra@xxxxxxx> > > This is an RFC series for Mirror VM support that are > essentially secondary VMs sharing the encryption context > (ASID) with a primary VM. The patch-set creates a new > VM and shares the primary VM's encryption context > with it using the KVM_CAP_VM_COPY_ENC_CONTEXT_FROM capability. > The mirror VM uses a separate pair of VM + vCPU file > descriptors and also uses a simplified KVM run loop, > for example, it does not support any interrupt vmexit's. etc. > Currently the mirror VM shares the address space of the > primary VM. Hi, I'd expect some entry in docs/ ? Thanks, Claudio > > The mirror VM can be used for running an in-guest migration > helper (MH). It also might have future uses for other in-guest > operations. > > The mirror VM support is enabled by adding a mirrorvcpus=N > suboption to -smp, which also designates a few vcpus (normally 1) > to the mirror VM. > > Example usage for starting a 4-vcpu guest, of which 1 vcpu is marked as > mirror vcpu. > > qemu-system-x86_64 -smp 4,mirrorvcpus=1 ... > > Ashish Kalra (7): > kvm: Add Mirror VM ioctl and enable cap interfaces. > kvm: Add Mirror VM support. > kvm: create Mirror VM and share primary VM's encryption context. > softmmu/cpu: Skip mirror vcpu's for pause, resume and synchronization. > kvm/apic: Disable in-kernel APIC support for mirror vcpu's. > hw/acpi: disable modern CPU hotplug interface for mirror vcpu's > hw/i386/pc: reduce fw_cfg boot cpu count taking into account mirror > vcpu's. > > Dov Murik (5): > machine: Add mirrorvcpus=N suboption to -smp > hw/boards: Add mirror_vcpu flag to CPUArchId > hw/i386: Mark mirror vcpus in possible_cpus > cpu: Add boolean mirror_vcpu field to CPUState > hw/i386: Set CPUState.mirror_vcpu=true for mirror vcpus > > Tobin Feldman-Fitzthum (1): > hw/acpi: Don't include mirror vcpus in ACPI tables > > accel/kvm/kvm-accel-ops.c | 45 ++++++- > accel/kvm/kvm-all.c | 244 +++++++++++++++++++++++++++++++++++++- > accel/kvm/kvm-cpus.h | 2 + > hw/acpi/cpu.c | 21 +++- > hw/core/cpu-common.c | 1 + > hw/core/machine.c | 7 ++ > hw/i386/acpi-build.c | 5 + > hw/i386/acpi-common.c | 5 + > hw/i386/kvm/apic.c | 15 +++ > hw/i386/pc.c | 10 ++ > hw/i386/x86.c | 11 +- > include/hw/acpi/cpu.h | 1 + > include/hw/boards.h | 3 + > include/hw/core/cpu.h | 3 + > include/hw/i386/x86.h | 3 +- > include/sysemu/kvm.h | 15 +++ > qapi/machine.json | 5 +- > softmmu/cpus.c | 27 +++++ > softmmu/vl.c | 3 + > target/i386/kvm/kvm.c | 42 +++++++ > 20 files changed, 459 insertions(+), 9 deletions(-) >
