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Date: Tue, 22 Mar 2022 18:13:09 +0000
From: Oliver Upton <oupton@...gle.com>
To: Gavin Shan <gshan@...hat.com>
Cc: kvmarm@...ts.cs.columbia.edu, maz@...nel.org,
linux-kernel@...r.kernel.org, eauger@...hat.com,
shan.gavin@...il.com, Jonathan.Cameron@...wei.com,
pbonzini@...hat.com, vkuznets@...hat.com, will@...nel.org
Subject: Re: [PATCH v5 00/22] Support SDEI Virtualization
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@...tlab-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
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