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From: "bhe@redhat.com" <bhe@redhat.com>
To: Dave Young <dyoung@redhat.com>
Cc: Junichi Nomura <j-nomura@ce.jp.nec.com>,
	Chao Fan <fanc.fnst@cn.fujitsu.com>,
	Borislav Petkov <bp@alien8.de>,
	"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: Thu, 4 Apr 2019 11:10:30 +0800
Message-ID: <20190404031030.GU7627@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20190404030037.GT7627@MiWiFi-R3L-srv>

On 04/04/19 at 11:00am, Baoquan He wrote:
> On 04/04/19 at 10:52am, Dave Young wrote:
> > On 04/04/19 at 01:23am, Junichi Nomura wrote:
> > > Hi Dave and Chao,
> > > 
> > > On 4/3/19 6:02 PM, 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:
> > > >>> 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.
> > > > 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.
> > > 
> > > I've tested 3 different models of EFI-booted baremetal servers with both
> > > normal kexec and panic kexec.  So far as I've tried Linus's v5.1-rc3,
> > > the problem always reproduced without the patch and disappears with the patch.
> > 
> > Hmm, both of my two laptops (Thinkpad T480s and T420) failed to boot with kexec.
> > 
> > I will see if I can find something, but it may need more time because
> > early console does not work especially after kexec.
> 
> Dave, can you try below patch to print debugging message and hang kernel
> to check the outputting? The hang is necessary, otherwise later printk
> printking will overwrite it.
> 
> diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
> index c0d6c560df69..68119547c4aa 100644
> --- a/arch/x86/boot/compressed/misc.c
> +++ b/arch/x86/boot/compressed/misc.c
> @@ -351,9 +351,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
>  	/* Clear flags intended for solely in-kernel use. */
>  	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);
>  
>  	if (boot_params->screen_info.orig_video_mode == 7) {
> @@ -370,6 +367,10 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
>  	console_init();
>  	debug_putstr("early console in extract_kernel\n");
>  
 +	/* Save RSDP address for later use. */
 +	boot_params->acpi_rsdp_addr = get_rsdp_addr();
 +
 +	error("Hang kernel for kexec debugging");

Sorry, here I means calling error() to hang kernel after calling
get_rsdp_addr().


>  	free_mem_ptr     = heap;	/* Heap */
>  	free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
>  

  reply index

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
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 [this message]
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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