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https://github.com/hanzoai/visor.git
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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]>
54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
"""List of platforms."""
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# Platform to associated tags.
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platforms = {
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"ptrace": [],
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"kvm": [],
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"slimvm": ["manual", "requires-slimvm"],
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"systrap": [],
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}
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# Capabilities that platforms may or may not support.
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# Used by platform_util.cc to determine which syscall tests are appropriate.
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_CAPABILITY_32BIT = "32BIT"
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_CAPABILITY_ALIGNMENT_CHECK = "ALIGNMENT_CHECK"
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_CAPABILITY_MULTIPROCESS = "MULTIPROCESS"
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_CAPABILITY_INT3 = "INT3"
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_CAPABILITY_VSYSCALL = "VSYSCALL"
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# platform_capabilities maps platform names to a dictionary of capabilities mapped to
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# True (supported) or False (unsupported).
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platform_capabilities = {
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"ptrace": {
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_CAPABILITY_32BIT: False,
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_CAPABILITY_ALIGNMENT_CHECK: True,
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_CAPABILITY_MULTIPROCESS: True,
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_CAPABILITY_INT3: True,
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_CAPABILITY_VSYSCALL: True,
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},
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"systrap": {
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_CAPABILITY_32BIT: False,
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_CAPABILITY_ALIGNMENT_CHECK: True,
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_CAPABILITY_MULTIPROCESS: True,
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_CAPABILITY_INT3: True,
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_CAPABILITY_VSYSCALL: True,
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},
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"kvm": {
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_CAPABILITY_32BIT: False,
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_CAPABILITY_ALIGNMENT_CHECK: True,
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_CAPABILITY_MULTIPROCESS: True,
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_CAPABILITY_INT3: False,
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_CAPABILITY_VSYSCALL: True,
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},
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"slimvm": {
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_CAPABILITY_32BIT: False,
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_CAPABILITY_ALIGNMENT_CHECK: True,
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_CAPABILITY_MULTIPROCESS: True,
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_CAPABILITY_INT3: False,
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_CAPABILITY_VSYSCALL: True,
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},
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}
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default_platform = "systrap"
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save_restore_platforms = ["systrap"]
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