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From: Dave Young <dyoung@redhat.com>
To: Junichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Boris Petkov <bp@alien8.de>,
	"fanc.fnst@cn.fujitsu.com" <fanc.fnst@cn.fujitsu.com>,
	"bp@suse.de" <bp@suse.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 if provided
Date: Mon, 25 Mar 2019 19:16:44 +0800
Message-ID: <20190325111644.GB13160@dhcp-128-65.nay.redhat.com> (raw)
In-Reply-To: <701c8e69-e1d4-c653-1d87-1c41789d3d54@ce.jp.nec.com>

On 03/25/19 at 10:36am, Junichi Nomura wrote:
> On 3/25/19 7:15 PM, Dave Young wrote:
> > On 03/25/19 at 09:54am, Boris Petkov wrote:
> >> On March 25, 2019 9:27:21 AM GMT+01:00, Junichi Nomura <j-nomura@ce.jp.nec.com> wrote:
> >>> On 3/25/19 3:59 PM, Dave Young wrote:
> >>>> On 03/25/19 at 06:47am, Junichi Nomura wrote:
> >>>>> On 3/25/19 3:19 PM, Dave Young wrote:
> >>>>>> On 03/25/19 at 02:01pm, Dave Young wrote:
> >>>>>> I think normally people do not see this bug, because kernel will
> >>> set the
> >>>>>> rsdp in boot_params->acpi_rsdp_addr.  Maybe you are testing with
> >>>>>
> >>>>> I think it's only done for file-based kexec interface.
> >>>>
> >>>> Saw Kairui's another reply, yes, kexec-tools need a patch to fill the
> >>>> value as well then.
> >>>>
> >>>> I would vote for a repost of your old patch with some #ifdef
> >>>
> >>> Thanks for comments, Dave, Kairui and Baoquan.
> >>>
> >>> The problem for me is it's a regression in v5.1-rc1, that breaks
> >>> existing setup. If early parsing of RSDP is required only for newly
> >>> supported configuration, I'm fine such configuration requires
> >>> new tools or new options.
> >>>
> >>> This is the 1st version plus #ifdef around the EFI code.
> >>
> >> I'm going to repeat that again until you get it:
> >>
> >> If the kexec kernel should continue to use efi_systab_init() then you
> >> should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
> > 
> > In that way, early parsing will fail in kexeced kernel, am I missing
> > something?  The early code become complicated but since we have already
> > the early acpi parsing why not to make it consistent in kexeced kernel?
> 
> AFAIU, early parsing is new code in v5.1-rc1 to support kexec on systems
> with hotpluggable memory with KASLR enabled. For systems that requires the
> new feature, it may be ok to say "you need to use another kexec interface"
> and/or "you need new kexec-tools".

Ok, it makes some sense, Kairui mentioned he will work on a kexec-tools
patch then this becomes a must.

Thanks
Dave

  reply index

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-22 11:03 [PATCH] " 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 [this message]
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
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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