Messages in this thread | | | Subject | Re: [PATCH] x86/EISA: Don't probe EISA bus for Xen PV guests | From | Boris Ostrovsky <> | Date | Tue, 11 Sep 2018 16:30:11 -0400 |
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On 9/11/18 4:20 PM, Thomas Gleixner wrote: > On Tue, 11 Sep 2018, Boris Ostrovsky wrote: > >> For unprivileged Xen PV guests this is normal memory and ioremap will >> not be able to properly map it. >> >> While at it, since ioremap may return NULL, add a test for pointer's >> validity. > I assume this goes back to very dead kernels, so that should go with a Cc > stable, right? >
Yes, I forgot to add those (and now I did), thanks for pointing this out.
It has to go at least all the way back to 4.13 since before f7eaf6e00fd58 ("x86/boot: Move EISA setup to a separate file"), just by luck, early_ioremap() worked for the guests.
-boris
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