[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] x86/cpu: Fix SMAP check in PVOPS environments
* Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote: > As the comment in arch/x86/include/asm/paravirt_types.h says: > > * Get/set interrupt state. save_fl and restore_fl are only > * expected to use X86_EFLAGS_IF; all other bits > * returned from save_fl are undefined, and may be ignored by > * restore_fl. There should be no 'may' about this: under CONFIG_PARAVIRT_DEBUG=y the reminder of the flags should be cleared (or all bits should be set: that will instantly crash if restored verbatim), so that we trip up generic code that relies on non-IF restoration? Thanks, Ingo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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