Date: Thu, 30 Aug 2018 12:22:36 +0300 From: Yuri Pankov <yuripv@yuripv.net> To: Rainer Hurling <rhurlin@gwdg.de>, Kyle Evans <kevans@freebsd.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: r336921 broke booting on MBP 2017, EFIRT related Message-ID: <52996f84-c215-f1da-8ce3-8bcfdbd79c40@yuripv.net> In-Reply-To: <7162d397-43df-01bc-f97d-0dae6a8f6926@gwdg.de> References: <499f05f4-4fab-9b31-5d37-83ecb554013c@yuripv.net> <20180829102727.GD2340@kib.kiev.ua> <b767f852-6e1a-1c02-11eb-5548aea26afe@yuripv.net> <a8611843-8fbc-c5d2-2246-1853fa4ca1b7@yuripv.net> <CACNAnaFvSGLs9XwQYZ%2BGVfmXwDD-Bh%2BgVvnkmOipKUHNOGS2DA@mail.gmail.com> <7162d397-43df-01bc-f97d-0dae6a8f6926@gwdg.de>
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This is a multi-part message in MIME format. --------------F489DB713008D84D090C16E3 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Rainer Hurling wrote: > Am 29.08.18 um 16:12 schrieb Kyle Evans: >> On Wed, Aug 29, 2018 at 6:53 AM Yuri Pankov <yuripv@yuripv.net> wrote: >>> >>> Yuri Pankov wrote: >>>> Konstantin Belousov wrote: >>>>> On Wed, Aug 29, 2018 at 12:37:52PM +0300, Yuri Pankov wrote: >>>>>> Hi, >>>>>> >>>>>> I've noticed that all recent snapshots (ALPHA3, ALPHA2, ALPHA1, >>>>>> 20180802) fail to boot on MBP 2017: >>>>>> >>>>>> kbd0 at kbdmux0 >>>>>> netmap: loaded module >>>>>> nexus0 >>>>>> >>>>>> Fatal trap 12: page fault while in kernel mode >>>>>> cpuid = 2: apic id = 02 >>>>>> fault virtual address = 0x74c64a50 >>>>>> fault code = supervisor read data, page not present >>>>>> instruction pointer = 0x20: 0x7abece31 >>>>>> stack pointer = 0x28: 0xffffffff82b2f7c0 >>>>>> frame pointer = 0x28: 0xffffffff82b2f810 >>>>>> code segment = base 0x0, limit 0xfffff, type 0x1b >>>>>> = DPL 0, pres 1, long 1, def32 0, gran 1 >>>>>> processor eflags = interrupt enabled, resume, IOPL = 0 >>>>>> current process = 0 (swapper) >>>>>> [ thread pid 0 tid 100000 ] >>>>>> Stopped at 0x7abece31: calll *0x18(%rax) >>>>>> db> >>>>>> >>>>>> Sadly, there's no support for internal keyboard yet (it's connected via >>>>>> SPI), and external USB one stops working. >>>>>> >>>>>> A (not so quick) bisect is pointing at r336921, which enabled EFIRT. >>>>>> >>>>>> Some questions here: >>>>>> - is this something that can/should be fixed? >>>>>> - can we print some "enabling EFIRT" message to the console to make >>>>>> guesses about the problem source a bit easier? >>>>> >>>>> It is not in 'enabling'. Looking at the faulting VA, I believe that >>>>> it occurs inside the BIOS code. >>>>> >>>>> Disable efirt by removing the kernel option, then try to load the module >>>>> at runtime. Does it still fault ? Also, get the efi mem map for the >>>>> machine and look at which region the faulting address and the faulting >>>>> instruction belong. >>>> >>>> kldload'ing the efirt module gets the same fault. Several top lines of >>>> backtrace: >>>> >>>> kernphys() at 0x7abece31 >>>> efi_get_time() at efi_get_time+0xd9 >>>> efirtc_probe() at efirtc_probe+0x17 >>> >>> For the efi mem map, if I'm understanding it correctly, there's the >>> following: >>> >>> ... >>> BootServicesData 00007421d000 000000000000 00000a8b UC WC WT WB >>> ... >>> RuntimeServicesCode 00007ab9f000 000000000000 00000070 UC WC WT WB >>> ... >>> >> >> Hi, >> >> I guess this patch might do it: >> https://people.freebsd.org/~kevans/efi-bootmap.diff >> >> Linux commit messages depict a tale in which they used to also only >> map RUNTIME entries, but they were effectively forced to back down on >> that because of buggy firmware that does exactly what you've described >> and they later reintroduced the restrictive mapping for i386-only >> where they'd not found such bugs. >> >> Thanks, >> >> Kyle Evans > > Hi Kyle, > > After Yuri had no success with the patches of kib, I tried your patch on > a DELL Latitude E6520 with BIOS version A21. Sorry, I accidentally took the discussion off-list, where Konstantin provided some more patches. I'm attaching the one that finally worked for me. It also adds some diagnostic prints which require bootverbose to be enabled. --------------F489DB713008D84D090C16E3 Content-Type: text/plain; charset=UTF-8; name="efirt.diff" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="efirt.diff" ZGlmZiAtLWdpdCBhL3N5cy9hbWQ2NC9hbWQ2NC9lZmlydF9tYWNoZGVwLmMgYi9zeXMvYW1k NjQvYW1kNjQvZWZpcnRfbWFjaGRlcC5jCmluZGV4IGRhNzc4MzA0M2EyLi44MGZmYTY2ZjVl YyAxMDA2NDQKLS0tIGEvc3lzL2FtZDY0L2FtZDY0L2VmaXJ0X21hY2hkZXAuYworKysgYi9z eXMvYW1kNjQvYW1kNjQvZWZpcnRfbWFjaGRlcC5jCkBAIC01NSw2ICs1NSw3IEBAIF9fRkJT RElEKCIkRnJlZUJTRCQiKTsKICNpbmNsdWRlIDxtYWNoaW5lL3ZtcGFyYW0uaD4KICNpbmNs dWRlIDx2bS92bS5oPgogI2luY2x1ZGUgPHZtL3BtYXAuaD4KKyNpbmNsdWRlIDx2bS92bV9l eHRlcm4uaD4KICNpbmNsdWRlIDx2bS92bV9tYXAuaD4KICNpbmNsdWRlIDx2bS92bV9vYmpl Y3QuaD4KICNpbmNsdWRlIDx2bS92bV9wYWdlLmg+CkBAIC0yNjYsNiArMjY3LDcgQEAgZWZp X2FyY2hfZW50ZXIodm9pZCkKIAogCWN1cnBtYXAgPSBQQ1BVX0dFVChjdXJwbWFwKTsKIAlQ TUFQX0xPQ0tfQVNTRVJUKGN1cnBtYXAsIE1BX09XTkVEKTsKKwljdXJ0aHJlYWQtPnRkX21k 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