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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [RFC XEN PATCH 00/23] xen: beginning support for RISC-V
On Mon, 2020-06-15 at 18:03 -0700, Stefano Stabellini wrote: > Any updates? I am looking forward to this :-) FYI, I would like to talk more about RISC-V Xen at the Xen Virtual summit. I'll put it forward as a BoF subject. I haven't worked on this, although the RISC-V Hypervisor spec is progressing towards ratification. Alistair > > > On Tue, 21 Jan 2020, Bobby Eshleman wrote: > > Hey everybody, > > > > This is an RFC patchset for the very beginnings of adding RISC-V > > support > > to Xen. This RFC is really just to start a dialogue about > > supporting > > RISC-V and align with the Xen project and community before going > > further. For that reason, it is very rough and very incomplete. > > > > My name is Bobby Eshleman, I'm a software engineer at > > Star Lab / Wind River on the ARM team, mostly having worked in the > > Linux > > kernel. I've also been involved a good amount with Xen on ARM > > here, > > mostly dealing with tooling, deployment, and testing. A lot of > > this > > patchset is heavily inspired by the Xen/ARM source code > > (particularly > > the early setup up code). > > > > Currently, this patchset really only sets up virtual memory for Xen > > and > > initializes UART to enable print output. None of RISC-V's > > virtualization support has been implemented yet, although that is > > the > > next road to start going down. Many functions only contain dummy > > implementations. Many shortcuts have been taken and TODO's have > > been > > left accordingly. It is very, very rough. Be forewarned: you are > > quite > > likely to see some ungainly code here (despite my efforts to clean > > it up > > before sending this patchset out). My intent with this RFC is to > > align > > early and gauge interest, as opposed to presenting a totally > > complete > > patchset. > > > > Because the ARM and RISC-V use cases will likely bear resemblance, > > the > > RISC-V port should probably respect the design considerations that > > have > > been laid out and respected by Xen on ARM for dom0less, safety > > certification, etc... My inclination has been to initially target > > or > > prioritize dom0less (without excluding dom0full) and use the ARM > > dom0less implementation as a model to follow. I'd love feedback on > > this > > point and on how the Xen project might envision a RISC-V > > implementation. > > > > This patchset has _some_ code for future support for 32-bit, but > > currently my focus is on 64-bit. > > > > Again, this is a very, very rough and totally incomplete > > patchset. My > > goal here is just to gauge community interest, begin discussing > > what Xen > > on RISC-V may look like, receive feedback, and see if I'm heading > > in the > > right direction. > > > > My big questions are: > > Does the Xen project have interest in RISC-V? > > What can be done to make the RISC-V port as upstreamable as > > possible? > > Any major pitfalls? > > > > It would be great to hear all of your feedback. > > > > Alistair Francis (20): > > HACK: OE Build changes > > HACK: Makefile: Don't build Xen tools > > riscv: makefiles and Kconfig > > riscv: Add riscv to tools/libxc header files > > riscv: Add asm-offsets.c > > riscv: Add delay.c > > riscv: Add domain.c > > riscv: Add domctl.c > > riscv: Add guestcopy.c > > riscv: Add time.c > > riscv: Add smp.c > > riscv: Add shutdown.c > > riscv: Add traps.c > > riscv: Add irq.c > > riscv: Add vm_event.c > > riscv: Add p2m.c > > riscv: Add the lib directory > > riscv: Add smpboot.c > > riscv: Add percpu.c > > riscv: Add sysctl.c > > > > Bobby Eshleman (3): > > riscv: header files > > riscv: early setup code > > riscv: Add iommu.c > > > > Makefile | 13 +- > > config/StdGNU.mk | 12 +- > > config/riscv64.mk | 7 + > > tools/configure | 32 +- > > tools/firmware/Makefile | 12 +- > > tools/libxc/include/xenctrl.h | 7 + > > tools/libxc/xc_core.h | 2 + > > tools/libxc/xc_core_riscv.h | 57 ++ > > xen/Makefile | 2 +- > > xen/Rules.mk | 2 +- > > xen/arch/Kconfig | 1 + > > xen/arch/riscv/Kconfig | 36 + > > xen/arch/riscv/Makefile | 62 ++ > > xen/arch/riscv/Rules.mk | 55 ++ > > xen/arch/riscv/asm-offsets.c | 38 + > > xen/arch/riscv/configs/riscv32_defconfig | 0 > > xen/arch/riscv/configs/riscv64_defconfig | 0 > > xen/arch/riscv/delay.c | 114 +++ > > xen/arch/riscv/domain.c | 273 +++++++ > > xen/arch/riscv/domctl.c | 53 ++ > > xen/arch/riscv/guestcopy.c | 158 ++++ > > xen/arch/riscv/head.S | 180 +++++ > > xen/arch/riscv/irq.c | 107 +++ > > xen/arch/riscv/lib/Makefile | 1 + > > xen/arch/riscv/lib/find_next_bit.c | 284 +++++++ > > xen/arch/riscv/mm.c | 925 > > +++++++++++++++++++++++ > > xen/arch/riscv/p2m.c | 261 +++++++ > > xen/arch/riscv/percpu.c | 84 ++ > > xen/arch/riscv/platforms/Kconfig | 31 + > > xen/arch/riscv/setup.c | 122 +++ > > xen/arch/riscv/shutdown.c | 24 + > > xen/arch/riscv/smp.c | 41 + > > xen/arch/riscv/smpboot.c | 114 +++ > > xen/arch/riscv/sysctl.c | 31 + > > xen/arch/riscv/time.c | 74 ++ > > xen/arch/riscv/traps.c | 56 ++ > > xen/arch/riscv/vm_event.c | 42 + > > xen/arch/riscv/xen.lds.S | 262 +++++++ > > xen/drivers/passthrough/Makefile | 1 + > > xen/drivers/passthrough/riscv/Makefile | 1 + > > xen/drivers/passthrough/riscv/iommu.c | 74 ++ > > xen/include/asm-riscv/altp2m.h | 39 + > > xen/include/asm-riscv/asm.h | 76 ++ > > xen/include/asm-riscv/atomic.h | 249 ++++++ > > xen/include/asm-riscv/bitops.h | 331 ++++++++ > > xen/include/asm-riscv/bug.h | 59 ++ > > xen/include/asm-riscv/byteorder.h | 16 + > > xen/include/asm-riscv/cache.h | 24 + > > xen/include/asm-riscv/cmpxchg.h | 382 ++++++++++ > > xen/include/asm-riscv/config.h | 203 +++++ > > xen/include/asm-riscv/csr.h | 117 +++ > > xen/include/asm-riscv/current.h | 50 ++ > > xen/include/asm-riscv/debugger.h | 15 + > > xen/include/asm-riscv/delay.h | 28 + > > xen/include/asm-riscv/desc.h | 12 + > > xen/include/asm-riscv/device.h | 15 + > > xen/include/asm-riscv/div64.h | 23 + > > xen/include/asm-riscv/domain.h | 85 +++ > > xen/include/asm-riscv/event.h | 42 + > > xen/include/asm-riscv/fence.h | 12 + > > xen/include/asm-riscv/flushtlb.h | 56 ++ > > xen/include/asm-riscv/grant_table.h | 93 +++ > > xen/include/asm-riscv/guest_access.h | 164 ++++ > > xen/include/asm-riscv/guest_atomics.h | 62 ++ > > xen/include/asm-riscv/hardirq.h | 27 + > > xen/include/asm-riscv/hypercall.h | 12 + > > xen/include/asm-riscv/init.h | 42 + > > xen/include/asm-riscv/io.h | 283 +++++++ > > xen/include/asm-riscv/iocap.h | 16 + > > xen/include/asm-riscv/iommu.h | 49 ++ > > xen/include/asm-riscv/irq.h | 58 ++ > > xen/include/asm-riscv/mem_access.h | 35 + > > xen/include/asm-riscv/mm.h | 308 ++++++++ > > xen/include/asm-riscv/monitor.h | 65 ++ > > xen/include/asm-riscv/nospec.h | 25 + > > xen/include/asm-riscv/numa.h | 41 + > > xen/include/asm-riscv/p2m.h | 410 ++++++++++ > > xen/include/asm-riscv/page.h | 327 ++++++++ > > xen/include/asm-riscv/paging.h | 16 + > > xen/include/asm-riscv/pci.h | 31 + > > xen/include/asm-riscv/percpu.h | 34 + > > xen/include/asm-riscv/pgtable-bits.h | 53 ++ > > xen/include/asm-riscv/processor.h | 60 ++ > > xen/include/asm-riscv/random.h | 9 + > > xen/include/asm-riscv/regs.h | 42 + > > xen/include/asm-riscv/riscv_encoding.h | 682 +++++++++++++++++ > > xen/include/asm-riscv/setup.h | 16 + > > xen/include/asm-riscv/smp.h | 50 ++ > > xen/include/asm-riscv/softirq.h | 16 + > > xen/include/asm-riscv/spinlock.h | 13 + > > xen/include/asm-riscv/string.h | 28 + > > xen/include/asm-riscv/sysregs.h | 14 + > > xen/include/asm-riscv/system.h | 96 +++ > > xen/include/asm-riscv/time.h | 60 ++ > > xen/include/asm-riscv/trace.h | 12 + > > xen/include/asm-riscv/types.h | 73 ++ > > xen/include/asm-riscv/vm_event.h | 61 ++ > > xen/include/asm-riscv/xenoprof.h | 12 + > > xen/include/public/arch-riscv.h | 181 +++++ > > xen/include/public/arch-riscv/hvm/save.h | 39 + > > xen/include/public/hvm/save.h | 2 + > > xen/include/public/pmu.h | 2 + > > xen/include/public/xen.h | 2 + > > 103 files changed, 9064 insertions(+), 42 deletions(-) > > create mode 100644 config/riscv64.mk > > create mode 100644 tools/libxc/xc_core_riscv.h > > create mode 100644 xen/arch/riscv/Kconfig > > create mode 100644 xen/arch/riscv/Makefile > > create mode 100644 xen/arch/riscv/Rules.mk > > create mode 100644 xen/arch/riscv/asm-offsets.c > > create mode 100644 xen/arch/riscv/configs/riscv32_defconfig > > create mode 100644 xen/arch/riscv/configs/riscv64_defconfig > > create mode 100644 xen/arch/riscv/delay.c > > create mode 100644 xen/arch/riscv/domain.c > > create mode 100644 xen/arch/riscv/domctl.c > > create mode 100644 xen/arch/riscv/guestcopy.c > > create mode 100644 xen/arch/riscv/head.S > > create mode 100644 xen/arch/riscv/irq.c > > create mode 100644 xen/arch/riscv/lib/Makefile > > create mode 100644 xen/arch/riscv/lib/find_next_bit.c > > create mode 100644 xen/arch/riscv/mm.c > > create mode 100644 xen/arch/riscv/p2m.c > > create mode 100644 xen/arch/riscv/percpu.c > > create mode 100644 xen/arch/riscv/platforms/Kconfig > > create mode 100644 xen/arch/riscv/setup.c > > create mode 100644 xen/arch/riscv/shutdown.c > > create mode 100644 xen/arch/riscv/smp.c > > create mode 100644 xen/arch/riscv/smpboot.c > > create mode 100644 xen/arch/riscv/sysctl.c > > create mode 100644 xen/arch/riscv/time.c > > create mode 100644 xen/arch/riscv/traps.c > > create mode 100644 xen/arch/riscv/vm_event.c > > create mode 100644 xen/arch/riscv/xen.lds.S > > create mode 100644 xen/drivers/passthrough/riscv/Makefile > > create mode 100644 xen/drivers/passthrough/riscv/iommu.c > > create mode 100644 xen/include/asm-riscv/altp2m.h > > create mode 100644 xen/include/asm-riscv/asm.h > > create mode 100644 xen/include/asm-riscv/atomic.h > > create mode 100644 xen/include/asm-riscv/bitops.h > > create mode 100644 xen/include/asm-riscv/bug.h > > create mode 100644 xen/include/asm-riscv/byteorder.h > > create mode 100644 xen/include/asm-riscv/cache.h > > create mode 100644 xen/include/asm-riscv/cmpxchg.h > > create mode 100644 xen/include/asm-riscv/config.h > > create mode 100644 xen/include/asm-riscv/csr.h > > create mode 100644 xen/include/asm-riscv/current.h > > create mode 100644 xen/include/asm-riscv/debugger.h > > create mode 100644 xen/include/asm-riscv/delay.h > > create mode 100644 xen/include/asm-riscv/desc.h > > create mode 100644 xen/include/asm-riscv/device.h > > create mode 100644 xen/include/asm-riscv/div64.h > > create mode 100644 xen/include/asm-riscv/domain.h > > create mode 100644 xen/include/asm-riscv/event.h > > create mode 100644 xen/include/asm-riscv/fence.h > > create mode 100644 xen/include/asm-riscv/flushtlb.h > > create mode 100644 xen/include/asm-riscv/grant_table.h > > create mode 100644 xen/include/asm-riscv/guest_access.h > > create mode 100644 xen/include/asm-riscv/guest_atomics.h > > create mode 100644 xen/include/asm-riscv/hardirq.h > > create mode 100644 xen/include/asm-riscv/hypercall.h > > create mode 100644 xen/include/asm-riscv/init.h > > create mode 100644 xen/include/asm-riscv/io.h > > create mode 100644 xen/include/asm-riscv/iocap.h > > create mode 100644 xen/include/asm-riscv/iommu.h > > create mode 100644 xen/include/asm-riscv/irq.h > > create mode 100644 xen/include/asm-riscv/mem_access.h > > create mode 100644 xen/include/asm-riscv/mm.h > > create mode 100644 xen/include/asm-riscv/monitor.h > > create mode 100644 xen/include/asm-riscv/nospec.h > > create mode 100644 xen/include/asm-riscv/numa.h > > create mode 100644 xen/include/asm-riscv/p2m.h > > create mode 100644 xen/include/asm-riscv/page.h > > create mode 100644 xen/include/asm-riscv/paging.h > > create mode 100644 xen/include/asm-riscv/pci.h > > create mode 100644 xen/include/asm-riscv/percpu.h > > create mode 100644 xen/include/asm-riscv/pgtable-bits.h > > create mode 100644 xen/include/asm-riscv/processor.h > > create mode 100644 xen/include/asm-riscv/random.h > > create mode 100644 xen/include/asm-riscv/regs.h > > create mode 100644 xen/include/asm-riscv/riscv_encoding.h > > create mode 100644 xen/include/asm-riscv/setup.h > > create mode 100644 xen/include/asm-riscv/smp.h > > create mode 100644 xen/include/asm-riscv/softirq.h > > create mode 100644 xen/include/asm-riscv/spinlock.h > > create mode 100644 xen/include/asm-riscv/string.h > > create mode 100644 xen/include/asm-riscv/sysregs.h > > create mode 100644 xen/include/asm-riscv/system.h > > create mode 100644 xen/include/asm-riscv/time.h > > create mode 100644 xen/include/asm-riscv/trace.h > > create mode 100644 xen/include/asm-riscv/types.h > > create mode 100644 xen/include/asm-riscv/vm_event.h > > create mode 100644 xen/include/asm-riscv/xenoprof.h > > create mode 100644 xen/include/public/arch-riscv.h > > create mode 100644 xen/include/public/arch-riscv/hvm/save.h > > > > -- > > 2.25.0 > > > > The source code can be found on github: > > https://github.com/beshleman/xen/tree/port-to-risc-v > > > > The patchset only targets the QEMU virt board and it is tested on > > Alistair Francis's patchset for QEMU with RISC-V hypervisor > > extensions > > v0.5, found here: > > > > https://github.com/alistair23/qemu/tree/mainline/alistair/riscv-hyp-ext-v0.5.next > > > > QEMU is built with: > > git clone --single-branch --branch mainline/alistair/riscv-hyp- > > ext-v0.5.next \ > > https://github.com/alistair23/qemu.git > > cd qemu > > mkdir build && cd build > > ../configure --target-list=riscv64-softmmu > > make -j$(nproc) && make install > > > > The bootloader used is the standard OpenSBI, built with the > > command: > > CROSS_COMPILE=riscv64-unknown-linux-gnu- PLATFORM=qemu/virt > > FW_PAYLOAD_PATH=../xen/xen/xen make > > > > Xen/RISC-V is built with: > > XEN_TARGET_ARCH=riscv64 CROSS_COMPILE=riscv64-unknown-linux- > > gnu- make build > > > > Xen may be ran with the following command: > > qemu-system-riscv64 -cpu rv64,x-h=true -M virt -m 512M -display > > none \ > > -serial stdio -kernel \ > > opensbi/build/platform/qemu/virt/firmware/fw_payload.el > > f > > > > Also, shoutout to Alistair Francis (from Western Digital) for > > getting > > the ball rolling and doing a ton of the groundwork with > > Makefile/Kconfig, a ton of the RISC-V specific header files, and > > also > > the QEMU RISC-V H extension support, and Dan Robertson (a colleague > > of > > mine at Star Lab) for help in forward porting a number of patches > > that > > were out-of-sync with upstream. > > > > > > Thanks, > > Bobby Eshleman > >
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