platform: add SlimVM platform#13596
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SlimVM is a lightweight VMX-based platform for gVisor that accelerates sentry system calls by eliminating unnecessary user/kernel context switches. In a traditional gVisor + KVM setup, every guest syscall triggers a full VM exit to userspace, then re-enters the kernel via a regular syscall: gr0 -> hr0 (vm_exit) -> hr3 (ioctl return) -> hr0 (re-invoke syscall) SlimVM eliminates this overhead. When the guest executes a VMCALL, the VM exits into VMX root mode where SlimVM directly invokes the host kernel's syscall handler, then immediately resumes the guest: gr0 -> hr0 (vmcall + direct function call) SlimVM requires a companion kernel module that provides the /dev/slimvm device interface. See https://github.com/antgroup/slimvm for the kernel module and full documentation. A sentry->host getpid microbenchmark (Xeon 6982P-C, host kernel 5.10.134) shows the effect: | path | ns/op (mean of 10) | vs base | | ------ | -----------------: | ------: | | base | 82.5 | 1.0x | | slimvm | 420.9 | 5.1x | | kvm | 3566.1 | 43.2x | slimvm is ~8.5x faster than the kvm platform on this path. See the issue for details. Updates: #13330 Co-developed-by: Chenggang <chenggang.qcg@antfin.com> Co-developed-by: Robin Luk <lubin.lu@antgroup.com> Co-developed-by: Tiwei Bie <tiwei.btw@antgroup.com> Co-developed-by: Jianfeng Tan <henry.tjf@antgroup.com> Co-developed-by: liushi.ls <liushi.ls@antfin.com> Co-developed-by: Yong He <chenglang.hy@antgroup.com> Co-developed-by: Aaron Lu <ziqian.lzq@antfin.com> Co-developed-by: chris.zn <chris.zn@alibaba-inc.com> Co-developed-by: Lai Jiangshan <jiangshan.ljs@antfin.com> Co-developed-by: Lingfu <yupeng.chenyp@alibaba-inc.com> Co-developed-by: Min Le <lemin.lm@antgroup.com> Co-developed-by: Quan Xu <wutu.xq@alibaba-inc.com> Co-developed-by: Zhang Haoyu <zhanghaoyu.zhy@alibaba-inc.com> Co-developed-by: Dawei Shen <shendawei.sdw@antgroup.com> FUTURE_COPYBARA_INTEGRATE_REVIEW=#13331 from tianyuzhou95:albert/slimvm-pr 86eddc2 PiperOrigin-RevId: 940094281
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platform: add SlimVM platform
SlimVM is a lightweight VMX-based platform for gVisor that accelerates sentry system calls by eliminating unnecessary user/kernel context switches.
In a traditional gVisor + KVM setup, every guest syscall triggers a full VM exit to userspace, then re-enters the kernel via a regular syscall:
gr0 -> hr0 (vm_exit) -> hr3 (ioctl return) -> hr0 (re-invoke syscall)
SlimVM eliminates this overhead. When the guest executes a VMCALL, the VM exits into VMX root mode where SlimVM directly invokes the host kernel's syscall handler, then immediately resumes the guest:
gr0 -> hr0 (vmcall + direct function call)
SlimVM requires a companion kernel module that provides the /dev/slimvm device interface. See https://github.com/antgroup/slimvm for the kernel module and full documentation.
A sentry->host getpid microbenchmark (Xeon 6982P-C, host kernel 5.10.134)
shows the effect:
slimvm is ~8.5x faster than the kvm platform on this path. See the issue
for details.
Updates: #13330
Co-developed-by: Chenggang chenggang.qcg@antfin.com
Co-developed-by: Robin Luk lubin.lu@antgroup.com
Co-developed-by: Tiwei Bie tiwei.btw@antgroup.com
Co-developed-by: Jianfeng Tan henry.tjf@antgroup.com
Co-developed-by: liushi.ls liushi.ls@antfin.com
Co-developed-by: Yong He chenglang.hy@antgroup.com
Co-developed-by: Aaron Lu ziqian.lzq@antfin.com
Co-developed-by: chris.zn chris.zn@alibaba-inc.com
Co-developed-by: Lai Jiangshan jiangshan.ljs@antfin.com
Co-developed-by: Lingfu yupeng.chenyp@alibaba-inc.com
Co-developed-by: Min Le lemin.lm@antgroup.com
Co-developed-by: Quan Xu wutu.xq@alibaba-inc.com
Co-developed-by: Zhang Haoyu zhanghaoyu.zhy@alibaba-inc.com
Co-developed-by: Dawei Shen shendawei.sdw@antgroup.com
FUTURE_COPYBARA_INTEGRATE_REVIEW=#13331 from tianyuzhou95:albert/slimvm-pr 86eddc2