> On Feb 12, 2020, at 3:55 AM, Joerg Roedel <joro@xxxxxxxxxx> wrote: > > On Tue, Feb 11, 2020 at 02:41:25PM -0800, Andy Lutomirski wrote: >>> On Tue, Feb 11, 2020 at 5:53 AM Joerg Roedel <joro@xxxxxxxxxx> wrote: >>> >>> From: Joerg Roedel <jroedel@xxxxxxx> >>> >>> With SEV-ES, exception handling is needed very early, even before the >>> kernel has cleared the bss segment. In order to prevent clearing the >>> currently used IDT, move the IDT to the data segment. >> >> Ugh. At the very least this needs a comment in the code. > > Yes, right, added a comment for that. > >> I had a patch to fix the kernel ELF loader to clear BSS, which would >> fix this problem once and for all, but it didn't work due to the messy >> way that the decompressor handles memory. I never got around to >> fixing this, sadly. > > Aren't there other ways of booting (Xen-PV?) which don't use the kernel > ELF loader? Dunno. I would hope the any sane loader would clear BSS before executing anything. This isn’t currently the case, though. Oh well. > > Regards, > > Joerg _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
