Messages in this thread | | | Date | Mon, 05 Mar 2007 12:42:25 -0800 | From | Zachary Amsden <> | Subject | Re: [patch] paravirt: VDSO page is essential |
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Ingo Molnar wrote: > there's no need to disable the VDSO for old userspace ... >
Well, apart from the obvious question to which nobody actually knows the answer, (how many people run old user space that required CONFIG_COMPAT_VDSO), what do you think of reversing the boot option?
vdso=enabled (default - turn on VDSO on normal boots) vdso=disabled (turn off VDSO unconditionally) [vdso=compat] (default for COMPAT_VDSO - keep VDSO only when mapped at compat location. Note the option is not required to be implemented because it is logically implied from vdso=enabled && COMPAT_VDSO and the default boot behavior) vdso=force (keep VDSO even when moved to a new location and COMPAT_VDSO is enabled).
In our case, installing VMware tools in the guest would then detect if userspace supports VDSO or if it requires COMPAT_VDSO and would then set boot parameters for the kernel appropriately. And the native boot and kvm paravirt-ops boot are completely unaffected.
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