This is version 5 of the GICv3 guest emulation series (not for 3.19). As the changes this time were much smaller, I updated to tree to 3.18.0, as it includes some bug fixes in the VGIC. I addressed the remaining comments from Christoffer and Eric, thanks for the review! The changes this times were much smaller, most of them cosmetic or rewordings of commit messages and comments. I updated the kvm-gicv3/v4 branch in my repo[1] to carry all the delta patches. Those patches are just for reference to see what has changed between v4 and v5. For review and all other purposes please use the v5 branch. For a changelog summary see below, also each patch carries a changelog now. Only patches 05, 08, 12, 15, 17, 18 and 19 have been changed compared to v4. I dropped Christoffer's Reviewed-by: tag from 05/19 because of the newly added function, but added the respective tags to the other commit messages. I quickly tested this version with a GICv3 capable fast model in all endianness modes (LE guest on LE host, BE on LE, LE on BE, BE on BE). Both a GICv2 and a GICv3 guest were booted in all four combinations. A git repo hosting all these patches lives in the kvm-gicv3/v5 branch of: http://www.linux-arm.org/git?p=linux-ap.git git://linux-arm.org/linux-ap.git ----- GICv3 is the ARM generic interrupt controller designed to overcome some limits of the prevalent GICv2. Most notably it lifts the 8-CPU limit. Though with Linux-3.17 Marc introduced support for hosts to use a GICv3, the CPU limitation still applies to KVM guests, since the current code emulates a GICv2 only. Also, GICv2 backward compatibility being optional in GICv3, a number of systems won't be able to run GICv2 guests. This patch series provides code to emulate a GICv3 distributor and redistributor for any KVM guest. It requires a GICv3 in the host to work. With those patches one can run guests efficiently on any GICv3 host. It has the following features: - Affinity routing (support for up to 255 VCPUs, more possible) - System registers (as opposed to MMIO access) - No ITS - No priority support (as the GICv2 emulation) - No save / restore support so far (will be added soon) - Only Group1 interrupts support The first patches actually refactor the current VGIC code to make room for a different VGIC model to be dropped in with Patch 16. The remaining patches connect the new model to the kernel backend and the userland facing code. The series goes on top of v3.18.0. The necessary patches for kvmtool to enable the guest's GICv3 have been posted here before [2], an updated version will follow soon. There was some testing on the fast model with some I/O and interrupt affinity shuffling in a Linux guest with a varying number of VCPUs as well as some testing on a Juno board (GICv2 only, to spot regressions). Please review and test. I would be grateful for people to test for GICv2 regressions also (so on a GICv2 host with current kvmtool/qemu), as there is quite some refactoring on that front. Much of the code was inspired by MarcZ, also kudos to him for doing the rather painful rebase on top of v3.17-rc1. Cheers, Andre. [1] http://www.linux-arm.org/git?p=linux-ap.git [2] https://lists.cs.columbia.edu/pipermail/kvmarm/2014-June/010086.html Changes v4 ... v5: * fix size of GICD_IROUTER region * fix compilation on ARM with VGIC not configured * properly fix the remaining FIXME at the GICv3 memory allocation * minor style changes, comments and commit messages fixes Changes v3 ... v4: * bug-fix in handling GICv3 redistributor CFG register * move set/get_lr from gic_vm_ops back to vgic_ops (get rid of v3 06/19) * getting rid of init_emul() at all * rework guest GIC model initialization * use non-atomic bit-set and bit-clear functions * split up handle_mmio_misc* into multiple functions * refine handling of some reserved registers * use symbolic names for ICC_SGI1R_EL1 register fields (new patch 16/19) * move private parameter from MMIO accessors to struct kvm_mmio_exit * added documentation of new GICv3 guest device * added lots of comments * some renaming of identifiers * minor changes in style and code flow of various functions Changes v2 ... v3: * rebase to v3.18-rc2 * adapt to new kvm_register_device() function * split up vm_ops patch and the GICv2 split-off patch to ease review * various smaller changes due to Christoffer's review * fix compilation for arm * remove support for trapping SGI sysreg accesses on arm hosts Changes v1 ... v2: * rebase to v3.17-rc1, caused quite some changes to the init code * new 9/15 patch to make 10/15 smaller * fix wrongly ordered cp15 register trap entry (MarcZ) * fix SGI broadcast (thanks to wanghaibin for spotting) * fix broken bailout path in kvm_vgic_create (wanghaibin) * check return value of init_emulation_ops() (wanghaibin) * fix return value check in vgic_[sg]et_attr() * add header inclusion guards * remove double definition of VCPU_NOT_ALLOCATED * some code move-around * whitespace fixes Andre Przywara (19): arm/arm64: KVM: rework MPIDR assignment and add accessors arm/arm64: KVM: pass down user space provided GIC type into vGIC code arm/arm64: KVM: refactor vgic_handle_mmio() function arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones arm/arm64: KVM: introduce per-VM ops arm/arm64: KVM: move kvm_register_device_ops() into vGIC probing arm/arm64: KVM: dont rely on a valid GICH base address arm/arm64: KVM: make the maximum number of vCPUs a per-VM value arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable arm/arm64: KVM: refactor MMIO accessors arm/arm64: KVM: refactor/wrap vgic_set/get_attr() arm/arm64: KVM: add vgic.h header file arm/arm64: KVM: split GICv2 specific emulation code from vgic.c arm/arm64: KVM: add opaque private pointer to MMIO data arm/arm64: KVM: add virtual GICv3 distributor emulation arm64: GICv3: introduce symbolic names for GICv3 ICC_SGI1R_EL1 fields arm64: KVM: add SGI generation register emulation arm/arm64: KVM: enable kernel side of GICv3 emulation arm/arm64: KVM: allow userland to request a virtual GICv3 Documentation/virtual/kvm/devices/arm-vgic.txt | 22 +- arch/arm/include/asm/kvm_emulate.h | 5 +- arch/arm/include/asm/kvm_host.h | 3 + arch/arm/include/asm/kvm_mmio.h | 1 + arch/arm/kvm/Makefile | 1 + arch/arm/kvm/arm.c | 23 +- arch/arm/kvm/psci.c | 17 +- arch/arm64/include/asm/kvm_emulate.h | 5 +- arch/arm64/include/asm/kvm_host.h | 5 + arch/arm64/include/asm/kvm_mmio.h | 1 + arch/arm64/include/uapi/asm/kvm.h | 7 + arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kvm/Makefile | 2 + arch/arm64/kvm/sys_regs.c | 39 +- arch/arm64/kvm/vgic-v3-switch.S | 14 +- drivers/irqchip/irq-gic-v3.c | 14 +- include/kvm/arm_vgic.h | 41 +- include/linux/irqchip/arm-gic-v3.h | 44 + include/linux/kvm_host.h | 2 + include/uapi/linux/kvm.h | 2 + virt/kvm/arm/vgic-v2-emul.c | 811 ++++++++++++++++++ virt/kvm/arm/vgic-v2.c | 3 + virt/kvm/arm/vgic-v3-emul.c | 1013 ++++++++++++++++++++++ virt/kvm/arm/vgic-v3.c | 90 +- virt/kvm/arm/vgic.c | 1070 ++++++------------------ virt/kvm/arm/vgic.h | 122 +++ 26 files changed, 2485 insertions(+), 873 deletions(-) create mode 100644 virt/kvm/arm/vgic-v2-emul.c create mode 100644 virt/kvm/arm/vgic-v3-emul.c create mode 100644 virt/kvm/arm/vgic.h -- 1.7.9.5 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
