On Tue, Mar 22, 2022 at 04:06:48PM +0800, Gavin Shan wrote: > This series intends to virtualize Software Delegated Exception Interface > (SDEI), which is defined by DEN0054C (v1.1). It allows the hypervisor to > deliver NMI-alike SDEI event to guest and it's needed by Async PF to > deliver page-not-present notification from hypervisor to guest. The code > and the required qemu changes can be found from: > > https://developer.arm.com/documentation/den0054/c > https://github.com/gwshan/linux ("kvm/arm64_sdei") > https://github.com/gwshan/qemu ("kvm/arm64_sdei") > > For the design and migration needs, please refer to the document in > PATCH[21/22] in this series. The series is organized as below: > > PATCH[01] Introduces template for smccc_get_argx() > PATCH[02] Adds SDEI virtualization infrastructure > PATCH[03-17] Supports various SDEI hypercalls and event handling > PATCH[18-20] Adds ioctl commands to support migration and configuration > and exports SDEI capability > PATCH[21] Adds SDEI document > PATCH[22] Adds SDEI selftest case > > Testing > ======= > > [1] The selftest case included in this series works fine. The default SDEI > event, whose number is zero, can be registered, enabled, raised. The > SDEI event handler can be invoked. > > [host]# pwd > /home/gavin/sandbox/linux.main/tools/testing/selftests/kvm > [root@virtlab-arm01 kvm]# ./aarch64/sdei > > NR_VCPUS: 2 SDEI Event: 0x00000000 > > --- VERSION > Version: 1.1 (vendor: 0x4b564d) > --- FEATURES > Shared event slots: 0 > Private event slots: 0 > Relative mode: No > --- PRIVATE_RESET > --- SHARED_RESET > --- PE_UNMASK > --- EVENT_GET_INFO > Type: Private > Priority: Normal > Signaled: Yes > --- EVENT_REGISTER > --- EVENT_ENABLE > --- EVENT_SIGNAL > Handled: Yes > IRQ: No > Status: Registered-Enabled-Running > PC/PSTATE: 000000000040232c 00000000600003c5 > Regs: 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 > --- PE_MASK > --- EVENT_DISABLE > --- EVENT_UNREGISTER > > Result: OK > > [2] There are additional patches in the following repositories to create > procfs entries, allowing to inject SDEI event from host side. The > SDEI client in the guest side registers the SDEI default event, whose > number is zero. Also, the QEMU exports SDEI ACPI table and supports > migration for SDEI. > > https://github.com/gwshan/linux ("kvm/arm64_sdei") > https://github.com/gwshan/qemu ("kvm/arm64_sdei") > > [2.1] Start the guests and migrate the source VM to the destination > VM. > > [host]# /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \ > -accel kvm -machine virt,gic-version=host \ > -cpu host -smp 6,sockets=2,cores=3,threads=1 \ > -m 1024M,slots=16,maxmem=64G \ > : \ > -kernel /home/gavin/sandbox/linux.guest/arch/arm64/boot/Image \ > -initrd /home/gavin/sandbox/images/rootfs.cpio.xz \ > -append earlycon=pl011,mmio,0x9000000 \ > : > > [host]# /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \ > -accel kvm -machine virt,gic-version=host \ > -cpu host -smp 6,sockets=2,cores=3,threads=1 \ > -m 1024M,slots=16,maxmem=64G \ > : \ > -kernel /home/gavin/sandbox/linux.guest/arch/arm64/boot/Image \ > -initrd /home/gavin/sandbox/images/rootfs.cpio.xz \ > -append earlycon=pl011,mmio,0x9000000 \ > -incoming tcp:0:4444 \ > : > > [2.2] Check kernel log on the source VM. The SDEI service is enabled > and the default SDEI event (0x0) is enabled. > > [guest-src]# dmesg | grep -i sdei > ACPI: SDEI 0x000000005BC80000 000024 \ > (v00 BOCHS BXPC 00000001 BXPC 00000001) > sdei: SDEIv1.1 (0x4b564d) detected in firmware. > SDEI TEST: Version 1.1, Vendor 0x4b564d > sdei_init: SDEI event (0x0) registered > sdei_init: SDEI event (0x0) enabled > > > (qemu) migrate -d tcp:localhost:4444 > > [2.3] Migrate the source VM to the destination VM. Inject SDEI event > to the destination VM. The event is raised and handled. > > (qemu) migrate -d tcp:localhost:4444 > > [host]# echo 0 > /proc/kvm/kvm-5360/vcpu-1 > > [guest-dst]# > =========== SDEI Event (CPU#1) =========== > Event: 0000000000000000 Parameter: 00000000dabfdabf > PC: ffff800008cbb554 PSTATE: 00000000604000c5 SP: ffff800009c7bde0 > Regs: 00000000000016ee ffff00001ffd2e28 00000000000016ed 0000000000000001 > ffff800016c28000 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 0000000000000000 ffff800009399008 > ffff8000097d9af0 ffff8000097d99f8 ffff8000093a8db8 ffff8000097d9b18 > 0000000000000000 0000000000000000 ffff000000339d00 0000000000000000 > 0000000000000000 ffff800009c7bde0 ffff800008cbb5c4 > Context: 00000000000016ee ffff00001ffd2e28 00000000000016ed 0000000000000001 > ffff800016c28000 03ffffffffffffff 000000024325db59 ffff8000097de190 > ffff00000033a790 ffff800008cbb814 0000000000000a30 0000000000000000 > > Changelog > ========= > v5: Next time can you include a link to the cover letter of the previous patch set? It is extremely helpful for understanding the progress to date and allows reviewers to see prior feedback. -- Thanks, Oliver _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
