From: Chao Fan <fanc.fnst@cn.fujitsu.com>
To: Dave Young <dyoung@redhat.com>
Cc: Junichi Nomura <j-nomura@ce.jp.nec.com>,
Borislav Petkov <bp@alien8.de>, "bhe@redhat.com" <bhe@redhat.com>,
"kasong@redhat.com" <kasong@redhat.com>,
"x86@kernel.org" <x86@kernel.org>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel
Date: Wed, 3 Apr 2019 17:39:47 +0800 [thread overview]
Message-ID: <20190403093947.GJ1555@localhost.localdomain> (raw)
In-Reply-To: <20190403090210.GH1555@localhost.localdomain>
On Wed, Apr 03, 2019 at 05:02:11PM +0800, Chao Fan wrote:
>On Wed, Apr 03, 2019 at 04:23:06PM +0800, Chao Fan wrote:
>>On Wed, Apr 03, 2019 at 04:09:16PM +0800, Dave Young wrote:
>>>On 04/03/19 at 03:21pm, Chao Fan wrote:
>>>> On Wed, Apr 03, 2019 at 01:53:40PM +0800, Dave Young wrote:
>>>> >On 04/03/19 at 01:35pm, Chao Fan wrote:
>>>> >> On Tue, Apr 02, 2019 at 08:03:19PM +0800, Dave Young wrote:
>>>> >> >On 04/01/19 at 12:08am, Junichi Nomura wrote:
>[...]
>>>> >
>>>> >It is weird to me. Probably I need find out why I can not reproduce the
>>>> >bug this patch is addressing first.
>>>>
>>>> Hmm, is your laptop booted from EFI or legacy BIOS?
>>>
>>>EFI booted.
>>>
>>>> >
>>>> >earlyprintk seems not working for me anymore, it is not easy to debug on
>>>> >laptop now.
>>>>
>>>> Another computer can help print the console message.
>>>> I remeber you are good at debug on two computers.
>>>
>>>I used to use earlyprintk, but seems earlyprintk can not work so early.
>>>So I only can try to comment out code manually.
>>
>>Ah, I got it. If you want to use earlyprintk to print message of
>>get_rsdp_addr(), you should change some code.
>>Because get_rsdp_addr() is called before earlyprintk initialed.
>>
>>I am still testing, but in my debug stage, I change like this:
>>diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
>>index c0d6c560df69..dbbe8d9a5792 100644
>>--- a/arch/x86/boot/compressed/misc.c
>>+++ b/arch/x86/boot/compressed/misc.c
>>@@ -352,7 +352,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
>> boot_params->hdr.loadflags &= ~KASLR_FLAG;
>>
>> /* Save RSDP address for later use. */
>>- boot_params->acpi_rsdp_addr = get_rsdp_addr();
>>
>> sanitize_boot_params(boot_params);
>>
>>@@ -368,6 +367,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
>> cols = boot_params->screen_info.orig_video_cols;
>>
>> console_init();
>>+ boot_params->acpi_rsdp_addr = get_rsdp_addr();
>> debug_putstr("early console in extract_kernel\n");
>>
>> free_mem_ptr = heap; /* Heap */
>>
>>Call this function after console_init().
>>That will make earlyprintk works.
>>
>>>
>>>It seems to be still some bug in early acpi code because if I
>>>return 0 in get rsdp function it just works.
>>>
>>>This guess make sense to me for now:
>>>1. nokaslr does not work because it may only avoid randomization, but it
>>>does not avoid running the early acpi parsing code.
>>>
>>>2. kexec does not work without the patch we talked about, because I just
>>>reproduced Junichi reported bug, sometimes hang, or reset, it is
>>>understandable.
>>>
>>>3. kexec does not work with the patch, so there is still bugs in the
>>>code.
>>>
>>>So several things to do is:
>>>
>>>Fix 1. (separate issue), Baoquan or either of you may want to fix it :)
>>
>>For 1, I think it's not needed to fix. Since not only KASLR needs RSDP.
>>So nokaslr should not stop the acpi parsing code.
>>>
>>>Fix 3. need more debugging, have you or Junichi run tests on more real
>>>hardware, maybe it is easier to reproduce on real hardware, I'm glad to
>>>help to try test patch or provide any help.
>>
>>I am still testing in real hardware.
>
>Hi Dave,
>
>I find a Fujitsu Desktop PC to test it.
>Without this PATCH, it failed to kexec and kdump.
>With this PATCH, it succeed to kexec.
>But failed to kdump. From the log, I think it didn't jump to the second
>kernel, just reboot after panic. I have not figured out what's the
>problem, but it seems not caused by this PATCH.
I comment out this line:
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index c0d6c560df69..4d826abe659c 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -352,7 +352,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
boot_params->hdr.loadflags &= ~KASLR_FLAG;
/* Save RSDP address for later use. */
- boot_params->acpi_rsdp_addr = get_rsdp_addr();
+ //boot_params->acpi_rsdp_addr = get_rsdp_addr();
sanitize_boot_params(boot_params);
Kdump also failed to jump to the second kernel and just hang.
So I think it's another issue. As for this PATCH, I think it works.
So for now, we only find your laptop will meet the problem, so maybe
you can debug for more information.
Thanks,
Chao Fan
>So I still think this PATCH works for the Fujitsu Desktop PC.
>
>As for your issue, I think there may be some problems related to specified
>hardware. Are you using a Lenovo laptop?
>
>And I am not sure how Nomura tested it.
>
>Thanks,
>Chao Fan
>
>>
>>Thanks,
>>Chao Fan
>>
>>>
>>>Thanks
>>>Dave
>>>
>>>
next prev parent reply other threads:[~2019-04-03 9:39 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 11:03 [PATCH] x86/boot: Use EFI setup data if provided Junichi Nomura
2019-03-22 15:23 ` Borislav Petkov
2019-03-25 0:27 ` Junichi Nomura
2019-03-25 6:01 ` Dave Young
2019-03-25 6:19 ` Dave Young
2019-03-25 6:45 ` Kairui Song
2019-03-25 6:47 ` Junichi Nomura
2019-03-25 6:59 ` Dave Young
2019-03-25 8:27 ` [PATCH v2] " Junichi Nomura
2019-03-25 8:54 ` Boris Petkov
2019-03-25 9:25 ` [PATCH v2] x86/boot: Don't try to search RSDP from EFI when kexec-booted Junichi Nomura
2019-03-25 10:15 ` [PATCH v2] x86/boot: Use EFI setup data if provided Dave Young
2019-03-25 10:36 ` Junichi Nomura
2019-03-25 11:16 ` Dave Young
2019-03-25 12:01 ` Borislav Petkov
2019-03-25 12:23 ` Dave Young
2019-03-25 12:32 ` Borislav Petkov
2019-03-25 23:10 ` Junichi Nomura
2019-03-26 12:46 ` Dave Young
2019-03-26 13:57 ` Borislav Petkov
2019-03-27 1:48 ` bhe
2019-03-27 12:14 ` Borislav Petkov
2019-03-28 4:17 ` Junichi Nomura
2019-03-28 6:26 ` Chao Fan
2019-03-28 6:43 ` bhe
2019-03-28 7:43 ` Junichi Nomura
2019-03-28 15:52 ` Borislav Petkov
2019-03-29 3:05 ` Junichi Nomura
2019-03-29 8:39 ` Borislav Petkov
2019-03-29 9:05 ` Chao Fan
2019-03-29 9:16 ` Borislav Petkov
2019-03-29 9:37 ` Junichi Nomura
2019-03-29 9:44 ` Chao Fan
2019-03-29 9:56 ` Junichi Nomura
2019-03-29 7:20 ` [PATCH] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel Junichi Nomura
2019-03-29 7:49 ` bhe
2019-03-29 8:29 ` Chao Fan
2019-03-29 8:39 ` Junichi Nomura
2019-03-29 9:18 ` Chao Fan
2019-03-29 9:16 ` bhe
2019-03-29 9:20 ` Chao Fan
2019-04-01 0:08 ` [PATCH v2] " Junichi Nomura
2019-04-02 9:41 ` Chao Fan
2019-04-02 9:53 ` Junichi Nomura
2019-04-02 11:06 ` Chao Fan
2019-04-02 10:22 ` Junichi Nomura
2019-04-02 12:03 ` Dave Young
2019-04-03 5:35 ` Chao Fan
2019-04-03 5:53 ` Dave Young
2019-04-03 6:39 ` Dave Young
2019-04-03 7:30 ` Chao Fan
2019-04-03 7:50 ` bhe
2019-04-03 8:23 ` Dave Young
2019-04-03 8:26 ` Dave Young
2019-04-03 16:14 ` Borislav Petkov
2019-04-04 1:02 ` Chao Fan
2019-04-03 9:28 ` Chao Fan
2019-04-03 7:21 ` Chao Fan
2019-04-03 8:09 ` Dave Young
2019-04-03 8:23 ` Chao Fan
2019-04-03 9:02 ` Chao Fan
2019-04-03 9:39 ` Chao Fan [this message]
2019-04-04 1:23 ` Junichi Nomura
2019-04-04 2:52 ` Dave Young
2019-04-04 3:00 ` bhe
2019-04-04 3:10 ` bhe
2019-04-04 3:22 ` Dave Young
2019-04-04 6:41 ` Dave Young
2019-04-04 7:20 ` Chao Fan
2019-04-04 7:41 ` Dave Young
2019-04-04 7:48 ` Chao Fan
2019-04-04 12:22 ` Borislav Petkov
2019-04-04 14:08 ` Dave Young
2019-04-03 8:18 ` Dave Young
2019-04-02 10:25 ` [PATCH v3] " Junichi Nomura
2019-04-04 7:32 ` Dave Young
2019-04-04 12:24 ` Borislav Petkov
2019-04-04 14:12 ` Dave Young
2019-04-04 14:41 ` Borislav Petkov
2019-04-05 1:36 ` Dave Young
2019-04-05 4:19 ` Junichi Nomura
2019-03-28 23:11 ` [PATCH v2] x86/boot: Use EFI setup data if provided bhe
2019-03-29 3:34 ` Junichi Nomura
2019-03-29 3:52 ` bhe
2019-03-29 5:16 ` Junichi Nomura
2019-03-25 7:27 ` [PATCH] " Baoquan He
2019-03-25 7:53 ` Borislav Petkov
2019-03-25 8:21 ` Baoquan He
2019-03-25 8:43 ` Thomas Gleixner
2019-03-25 9:03 ` Baoquan He
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