mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Tianyu Zhou
fc1afc9de5
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: │ ns/op │ 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: https://github.com/google/gvisor/issues/13330 Co-developed-by: Chenggang <[email protected]> Co-developed-by: Robin Luk <[email protected]> Co-developed-by: Tiwei Bie <[email protected]> Co-developed-by: Jianfeng Tan <[email protected]> Co-developed-by: liushi.ls <[email protected]> Co-developed-by: Yong He <[email protected]> Co-developed-by: Aaron Lu <[email protected]> Co-developed-by: chris.zn <[email protected]> Co-developed-by: Lai Jiangshan <[email protected]> Co-developed-by: Lingfu <[email protected]> Co-developed-by: Min Le <[email protected]> Co-developed-by: Quan Xu <[email protected]> Co-developed-by: Zhang Haoyu <[email protected]> Co-developed-by: Dawei Shen <[email protected]> Signed-off-by: Tianyu Zhou <[email protected]>
37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
# The go_library rule is imported as a different name in this case,
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# in order to avoid automated tooling doing the wrong thing with the
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# operating-specific dependencies listed below.
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load("//tools:defs.bzl", "platforms", "select_arch", "select_system", exempt_go_library = "go_library")
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package(
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default_applicable_licenses = ["//:license"],
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licenses = ["notice"],
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)
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exempt_go_library(
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name = "platforms",
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srcs = [
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"platforms.go",
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"platforms_amd64.go",
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"platforms_darwin.go",
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],
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# Nothing needs to be stateified, and stateify has trouble when select is
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# used to choose deps.
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stateify = False,
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visibility = [
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"//:sandbox",
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],
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deps = select_system(
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darwin = [],
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linux = [
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"//pkg/sentry/platform/%s" % platform
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for platform in platforms
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if "internal" not in platforms[platform] and platform != "slimvm"
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],
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) + select_arch(
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# SlimVM is implemented only on amd64.
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amd64 = ["//pkg/sentry/platform/slimvm"],
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default = [],
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),
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)
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