From: Lianbo Jiang <lijiang@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com,
hpa@zytor.com, x86@kernel.org, akpm@linux-foundation.org,
dan.j.williams@intel.com, thomas.lendacky@amd.com,
bhelgaas@google.com, baiyaowei@cmss.chinamobile.com,
tiwai@suse.de, bp@suse.de, brijesh.singh@amd.com,
dyoung@redhat.com, bhe@redhat.com
Subject: [PATCH 3/3 v3] x86/kexec_file: add reserved e820 ranges to kdump kernel e820 table
Date: Fri, 21 Sep 2018 15:32:11 +0800 [thread overview]
Message-ID: <20180921073211.20097-4-lijiang@redhat.com> (raw)
In-Reply-To: <20180921073211.20097-1-lijiang@redhat.com>
E820 reserved ranges is useful in kdump kernel, we have added this in
kexec-tools code.
One reason is PCI mmconf (extended mode) requires reserved region
otherwise it falls back to legacy mode.
When AMD SME kdump support, it needs to map dmi table area as unencrypted.
For normal boot, these ranges sit in e820 reserved ranges, thus the early
ioremap code naturally map them as unencrypted. If we also have same e820
reserve setup in kdump kernel then it will just work like normal kernel.
Suggested-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
arch/x86/kernel/crash.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index ae724a6e0a5f..3460be990e0c 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -384,6 +384,11 @@ int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params)
walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, &cmd,
memmap_entry_callback);
+ /* Add all reserved ranges */
+ cmd.type = E820_TYPE_RESERVED;
+ walk_iomem_res_desc(IORES_DESC_NONE, 0, 0, -1, &cmd,
+ memmap_entry_callback);
+
/* Add crashk_low_res region */
if (crashk_low_res.end) {
ei.addr = crashk_low_res.start;
--
2.17.1
next prev parent reply other threads:[~2018-09-21 7:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 7:32 [PATCH 0/3 v3] add reserved e820 ranges to the kdump kernel e820 table Lianbo Jiang
2018-09-21 7:32 ` [PATCH 1/3 v3] resource: fix an error which walks through iomem resources Lianbo Jiang
2018-09-24 17:52 ` Bjorn Helgaas
2018-09-25 7:08 ` lijiang
2018-09-24 22:14 ` [PATCH 0/3] find_next_iomem_res() fixes Bjorn Helgaas
2018-09-24 22:14 ` [PATCH 1/3] x86/kexec: Correct KEXEC_BACKUP_SRC_END off-by-one error Bjorn Helgaas
2018-09-24 22:14 ` [PATCH 2/3] resource: Include resource end in walk_*() interfaces Bjorn Helgaas
2018-09-24 22:15 ` [PATCH 3/3] resource: Fix find_next_iomem_res() iteration issue Bjorn Helgaas
2018-09-25 8:58 ` Baoquan He
2018-09-25 11:20 ` Baoquan He
2018-09-27 5:27 ` lijiang
2018-09-27 14:03 ` Bjorn Helgaas
2018-09-28 5:09 ` lijiang
2018-09-28 13:10 ` Borislav Petkov
2018-09-26 9:22 ` [PATCH 0/3] find_next_iomem_res() fixes lijiang
2018-09-26 13:36 ` lijiang
2018-09-21 7:32 ` [PATCH 2/3 v3] x86/kexec_file: add e820 entry in case e820 type string matches to io resource name Lianbo Jiang
2018-09-21 7:32 ` Lianbo Jiang [this message]
2018-10-16 2:56 ` [PATCH 0/3 v3] add reserved e820 ranges to the kdump kernel e820 table Dave Young
2018-10-16 3:45 ` lijiang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180921073211.20097-4-lijiang@redhat.com \
--to=lijiang@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=baiyaowei@cmss.chinamobile.com \
--cc=bhe@redhat.com \
--cc=bhelgaas@google.com \
--cc=bp@suse.de \
--cc=brijesh.singh@amd.com \
--cc=dan.j.williams@intel.com \
--cc=dyoung@redhat.com \
--cc=hpa@zytor.com \
--cc=kexec@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=tiwai@suse.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).