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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH 00/49] New VGIC(-v2) implementation
Hi, On 09/02/18 14:38, Andre Przywara wrote: > tl;dr: More preparatory patches from patch 07, actual new VGIC starting > at patch 20. > ============= > > During development of the Dom0 ITS MSI support last year we realised > that the existing GIC interrupt controller emulation has some shortcomings. > After some tries to fix those in the existing code, it was agreed upon > that the problems are fundamental and a new implementation based on the > "new VGIC" in KVM is the best choice. > This is the first drop of this new VGIC implementation. Just in case you are *really* interested: The code can also be found in the vgic-new/rfc branch here: git://linux-arm.org/xen-ap.git http://www.linux-arm.org/git?p=xen-ap.git;a=shortlog;h=refs/heads/vgic-new/rfc Cheers, Andre. > It lives in the > xen/arch/arm/vgic/ directory and is written to be a compile time option, > so people can choose whether to use the new VGIC or the existing > implementation. This is just for a transitional period, the old VGIC is > expected to be removed after confidence in the new implementation has grown. > > This series starts with some GICv3 redistributor cleanup, which I posted > before. I need to incorporate the comments from the list, but for now I left > those patches as it from the previous post. > > Starting with patch 07 there are some more cleanups and preparations for > the existing VGIC/GIC code. A big part of those patches are preparations to > properly support level triggered interrupts. This is one of the biggest > problems in the existing VGIC, which only correctly emulates edge triggered > IRQs. This affects both arch code and some users like the timer and the > event channel. > > Starting with patch 20 we plumb in the new VGIC then. This is done in a > new directory, with all the files actually not wired into the build system > until the very last patch. The idea is to split the series into reviewable > chunks without resorting to nasty hacks to keep bisectability. > The code was forked from Linux' virt/kvm/arm/vgic/, as of 4.14-rc7, plus > some recent changes to improve support for level triggered and hardware > mapped interrupts, which is what we use heavily in Dom0. The code was > heavily adapted to fit into Xen, starting with using the Xen coding style > and using Xen structure and variable names (struct domain instead of > struct kvm, for instance). Where interfacing functions were similar enough, > they were changed over to the existing Xen name and prototypes (for instance > kvm_vgic_create() was renamed to domain_vgic_register()). As far as possible > the code layout and split was re-used from KVM, so patches in Linux should > be relatively easy to port into Xen. Due to the mentioned changes this can > not be done easily in an automatic way, but it should be not too complicated > to extract the gist of the patch and re-apply this to our code base. > > The actual VGIC code splits into several parts: > - The core is the struct vgic_irq, which holds every information about a > virtual IRQ, including a per-IRQ lock. Also there is on (ordered) per-VCPU > list (ap_list), which links the interrupts to be considered by a VCPU. > There are functions to deal with queuing and removing IRQs from those lists > safely, obeying the locking order. (patches 20-23) > - There are functions to push vIRQs on a VCPU list to the list registers, > and handle their state changes. (patches 24-26) > - The distributor MMIO emulation is using separate functions per register, > also having read and write split. (patches 27-37) > - There are functions to deal with Xen specialities. (patches 38-43) > - The data structures and the wiring of the emulation into the hypervisor > and the guests are done in vgic-init.c. (patches 44-47) > - Finally patch 49 enables the build of the new VGIC. This requires to > increase the size limit for struct vcpu in patch 48. > > Please consider this series the first post that it is. It was briefly tested > on a Juno and a Midway (with and without CONFIG_NEW_VGIC). It does not cover > GICv3 yet, though supporting this should be relatively straightforward. > In fact I have most of the code here already, but I wanted to wait for > initial feedback before applying similar transformations to the *-v3.c files. > Also this does not include ITS support, though the code itself is more ready > for that than the old VGIC ever was. > I did some semi-automatic translation of coding style, so I am sure there > are quite some leftovers that slipped through, including identifiers with > kvm_ in their name ;-) > > I would appreciate if somehow could have a look at those patches, patch 20 > and following are surely the most interesting ones to have a look at. > > Cheers, > Andre > > Andre Przywara (49): > tools: ARM: vGICv3: avoid inserting optional DT properties > ARM: vGICv3: drop GUEST_GICV3_RDIST_REGIONS symbol > ARM: GICv3: use hardware GICv3 redistributor regions for Dom0 > ARM: GICv3: simplify GICv3 redistributor stride handling > ARM: vGICv3: always use architected redist stride > ARM: vGICv3: remove rdist_stride from VGIC structure > ARM: VGIC: move gic_remove_from_lr_pending() prototype > ARM: VGIC: move max_vcpus VGIC limit to struct arch_domain > ARM: VGIC: change to level-IRQ compatible IRQ injection interface > ARM: VGIC: carve out struct vgic_cpu and struct vgic_dist > ARM: VGIC: reorder prototypes in vgic.h > ARM: VGIC: introduce gic_get_nr_lrs() > ARM: VGIC: Add hypervisor base address to vgic_v2_setup_hw() > ARM: VGIC: extend GIC CPU interface definitions > ARM: GIC: Allow tweaking the active state of an IRQ > ARM: GIC: allow reading pending state of a hardware IRQ > ARM: timer: Handle level triggered IRQs correctly > ARM: evtchn: Handle level triggered IRQs correctly > ARM: vPL011: Use the VGIC's level triggered IRQs handling if available > ARM: new VGIC: Add data structure definitions > ARM: new VGIC: Add acccessor to new struct vgic_irq instance > ARM: new VGIC: Implement virtual IRQ injection > ARM: new VGIC: Add IRQ sorting > ARM: new VGIC: Add IRQ sync/flush framework > ARM: new VGIC: Add GICv2 world switch backend > ARM: new VGIC: Implement vgic_vcpu_pending_irq > ARM: new VGIC: Add MMIO handling framework > ARM: new VGIC: Add GICv2 MMIO handling framework > ARM: new VGIC: Add CTLR, TYPER and IIDR handlers > ARM: new VGIC: Add ENABLE registers handlers > ARM: new VGIC: Add PENDING registers handlers > ARM: new VGIC: Add ACTIVE registers handlers > ARM: new VGIC: Add PRIORITY registers handlers > ARM: new VGIC: Add CONFIG registers handlers > ARM: new VGIC: Add TARGET registers handlers > ARM: new VGIC: Add SGIR register handler > ARM: new VGIC: Add SGIPENDR register handlers > ARM: new VGIC: handle hardware mapped IRQs > ARM: new VGIC: Add event channel IRQ handling > ARM: new VGIC: Handle virtual IRQ allocation/reservation > ARM: new VGIC: dump virtual IRQ info > ARM: new VGIC: provide system register emulation stub > ARM: new VGIC: Add preliminary stub implementations > ARM: new VGIC: vgic-init: register VGIC > ARM: new VGIC: vgic-init: implement vgic_init > ARM: new VGIC: vgic-init: implement map_resources > ARM: new VGIC: Add vgic_v2_enable > ARM: allocate two pages for struct vcpu > ARM: VGIC: wire new VGIC(-v2) files into Xen build system > > tools/libxl/libxl_arm.c | 8 - > xen/arch/arm/Kconfig | 6 +- > xen/arch/arm/Makefile | 10 +- > xen/arch/arm/domain.c | 25 +- > xen/arch/arm/gic-v2.c | 20 +- > xen/arch/arm/gic-v3-lpi.c | 2 +- > xen/arch/arm/gic-v3.c | 72 ++-- > xen/arch/arm/gic-vgic.c | 10 +- > xen/arch/arm/gic.c | 15 + > xen/arch/arm/irq.c | 2 +- > xen/arch/arm/time.c | 36 +- > xen/arch/arm/traps.c | 2 + > xen/arch/arm/vgic-v2.c | 3 +- > xen/arch/arm/vgic-v3.c | 45 +- > xen/arch/arm/vgic.c | 46 +- > xen/arch/arm/vgic/vgic-init.c | 259 ++++++++++++ > xen/arch/arm/vgic/vgic-mmio-v2.c | 297 +++++++++++++ > xen/arch/arm/vgic/vgic-mmio.c | 589 ++++++++++++++++++++++++++ > xen/arch/arm/vgic/vgic-mmio.h | 194 +++++++++ > xen/arch/arm/vgic/vgic-v2.c | 339 +++++++++++++++ > xen/arch/arm/vgic/vgic.c | 871 > ++++++++++++++++++++++++++++++++++++++ > xen/arch/arm/vgic/vgic.h | 69 +++ > xen/arch/arm/vpl011.c | 6 +- > xen/arch/arm/vtimer.c | 4 +- > xen/common/Makefile | 1 + > xen/common/list_sort.c | 170 ++++++++ > xen/include/asm-arm/arm_vgic.h | 269 ++++++++++++ > xen/include/asm-arm/domain.h | 92 +--- > xen/include/asm-arm/event.h | 1 + > xen/include/asm-arm/gic.h | 31 +- > xen/include/asm-arm/gic_v3_defs.h | 5 + > xen/include/asm-arm/vgic.h | 170 ++++++-- > xen/include/public/arch-arm.h | 3 - > xen/include/xen/list_sort.h | 11 + > xen/include/xen/timer.h | 2 + > 35 files changed, 3456 insertions(+), 229 deletions(-) > create mode 100644 xen/arch/arm/vgic/vgic-init.c > create mode 100644 xen/arch/arm/vgic/vgic-mmio-v2.c > create mode 100644 xen/arch/arm/vgic/vgic-mmio.c > create mode 100644 xen/arch/arm/vgic/vgic-mmio.h > create mode 100644 xen/arch/arm/vgic/vgic-v2.c > create mode 100644 xen/arch/arm/vgic/vgic.c > create mode 100644 xen/arch/arm/vgic/vgic.h > create mode 100644 xen/common/list_sort.c > create mode 100644 xen/include/asm-arm/arm_vgic.h > create mode 100644 xen/include/xen/list_sort.h > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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