On Thu, Jul 30, 2015 at 01:09:16PM +0100, Matt Fleming wrote: > On Thu, 30 Jul, at 07:18:19PM, joeyli wrote: > > > > In the above case, just simply accessing EFI variable through efivars to > > reproduce issue: > > > > linux-aiip:~ # hexdump -C /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c > > Killed > > > > [ 257.856185] BUG: unable to handle kernel paging request at fffffffefd244e60 <=== address is in Runtime Data region > > [ 257.863200] IP: [<ffffffff81457cdd>] virt_efi_get_variable+0x5d/0xa0 > > [ 257.869586] PGD 1a0c067 PUD 13b0ae063 PMD 13b0bc063 PTE 0 > > [ 257.875056] Oops: 0000 [#1] SMP > > [...snip] > > [ 258.149804] RIP [<ffffffff81457cdd>] virt_efi_get_variable+0x5d/0xa0 > > [ 258.156273] RSP <ffff8800ba07fd78> > > [ 258.159769] CR2: fffffffefd244e60 > > [ 258.163090] ---[ end trace 9edb589760c07d3e ]--- > > > > 0xfffffffefd244e60 is covered by Runtime Data region after hibernate resumed: > > > > [ 0.125865] efi: mem26: [Runtime Data |RUN| | | | |WB|WT|WC|UC] pa=[0x00000000bb3e5000-0x00000000bb445000) va=[0xfffffffefd1e5000-0xfffffffefd245000) (0MB) > > 0xfffffffefd244e60 > > > > But this va address didn't mapped to any pa in hibernating kernel (image kernel): > > > > [ 0.111002] efi: mem24: [Runtime Code |RUN| | | | |WB|WT|WC|UC] pa=[0x00000000bb385000-0x00000000bb3e5000) va=[0xfffffffefd585000-0xfffffffefd5e5000) (0MB) > > [ 0.125883] efi: mem25: [Runtime Data |RUN| | | | |WB|WT|WC|UC] pa=[0x00000000bb3e5000-0x00000000bb445000) va=[0xfffffffefd3e5000-0xfffffffefd445000) (0MB) > > 0xfffffffefd244e60 <=== no mapping > > [ 0.140764] efi: mem29: [Boot Data | | | | | |WB|WT|WC|UC] pa=[0x00000000bb7ff000-0x00000000bb800000) va=[0xfffffffefd1ff000-0xfffffffefd200000) (0MB) > > > > > > So, when call EFI runtime services, got problem. > > Why is the new kernel calling the EFI runtime services via the old > mappings? > > -- > Matt Fleming, Intel Open Source Technology Center I think hibernate overwrite it. Joey Lee -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
