On 07/02/17 13:56, Sam Bobroff wrote: > Because KVM will soon provide the necessary infrastructure for KVM guests to > run on POWER9 CPUs, we can now start exploiting this new functionality from > QEMU. See: > https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-January/153433.html > > This work is not yet complete but it is functional and is presented for early > review. It overlaps in some places with current work supporting the same > guests > under full emulation. > > This set aims to support only the following scenarios: > * A POWER9 host running in radix mode, running a guest in radix mode. > * A POWER9 host running in hash mode, running a guest in hash mode. > * A POWER9 host running in hash mode, running a guest in legacy(+) mode. > (+) Where legacy means that the guest does not support ISA 3.00. > > Hash or radix mode for the host is controlled via the "disable_radix" kernel > command line parameter: the host will use radix unless disable_radix is given. > For the guest it should be automatically selected to match the host. > > Bad legacy guests: There are some recent kernels (e.g. 4.9) that will, when > run > as a KVM guest and if the ibm,pa-features entry in the device tree has the > Radix MMU bit set, attempt to initialize the MMU as if they were a host (which > will cause them to crash). To avoid exposing this problem, the Radix MMU bit > is removed from ibm,pa-features when a legacy guest is detected. > > Prerequsites: > * This set is based on current QEMU master, but relies on some work already > posted here: > https://lists.gnu.org/archive/html/qemu-devel/2017-01/msg02527.html > Specifically patches 1..4 which set up the new CPU and MMU models.
It would help if you pushed this as a tree with all prerequisites somewhere (github?); same about the kernel which has bits which this patchset is using. Thanks. > > Notes: > * Migration/snapshots are not yet investigated. > * If the host cannot support the guest (e.g. radix host and a legacy > guest) > then the guest will crash but QEMU should probably terminate with a > descriptive message. > > > Sam Bobroff (9): > spapr: fix off-by-one error in spapr_ovec_populate_dt() > Update headers using update-linux-headers.sh > spapr: Add ibm,processor-radix-AP-encodings to the device tree > target-ppc: support KVM_CAP_PPC_MMU_RADIX, KVM_CAP_PPC_MMU_HASH_V3 > spapr: Only setup HTP if necessary. > spapr: Add h_register_process_table() hypercall > spapr: Set ISA 3.00 radix and hash bits in OV5 > spapr: Advertise ISA 3.0 MMU features in pa_features > spapr: Small cleanup of PPC MMU enums > > hw/ppc/spapr.c | 152 +++++--- > hw/ppc/spapr_hcall.c | 52 ++- > hw/ppc/spapr_ovec.c | 2 +- > include/hw/ppc/spapr.h | 4 +- > include/hw/ppc/spapr_ovec.h | 6 + > include/standard-headers/linux/input-event-codes.h | 2 +- > include/standard-headers/linux/pci_regs.h | 8 + > include/standard-headers/linux/virtio_ids.h | 1 + > linux-headers/asm-arm/kvm.h | 2 + > linux-headers/asm-arm/unistd.h | 419 > +-------------------- > linux-headers/asm-powerpc/kvm.h | 25 ++ > linux-headers/asm-powerpc/unistd.h | 1 + > linux-headers/asm-x86/kvm_para.h | 4 +- > linux-headers/linux/kvm.h | 11 +- > linux-headers/linux/vfio.h | 10 + > target/ppc/cpu-qom.h | 12 +- > target/ppc/cpu.h | 5 + > target/ppc/kvm.c | 66 +++- > target/ppc/kvm_ppc.h | 13 + > target/ppc/mmu-hash64.c | 10 +- > target/ppc/mmu_helper.c | 67 ++-- > target/ppc/translate.c | 12 +- > 22 files changed, 346 insertions(+), 538 deletions(-) > -- Alexey
