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* [PATCH 0/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo
@ 2019-01-10 12:19 Lianbo Jiang
  2019-01-10 12:19 ` [PATCH 1/2 v6] kdump: add the vmcoreinfo documentation Lianbo Jiang
  2019-01-10 12:19 ` [PATCH 2/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo Lianbo Jiang
  0 siblings, 2 replies; 25+ messages in thread
From: Lianbo Jiang @ 2019-01-10 12:19 UTC (permalink / raw)
  To: linux-kernel
  Cc: kexec, tglx, mingo, bp, x86, akpm, bhe, dyoung, k-hagio,
	anderson, linux-doc

This patchset did two things:
a. add a new document for vmcoreinfo

This document lists some variables that export to vmcoreinfo, and briefly
describles what these variables indicate. It should be instructive for
many people who do not know the vmcoreinfo.

b. export the value of sme mask to vmcoreinfo

For AMD machine with SME feature, makedumpfile tools need to know whether
the crashed kernel was encrypted or not. If SME is enabled in the first
kernel, the crashed kernel's page table(pgd/pud/pmd/pte) contains the
memory encryption mask, so makedumpfile needs to remove the sme mask to
obtain the true physical address.

Changes since v1:
1. No need to export a kernel-internal mask to userspace, so copy the
value of sme_me_mask to a local variable 'sme_mask' and write the value
of sme_mask to vmcoreinfo.
2. Add comment for the code.
3. Improve the patch log.
4. Add the vmcoreinfo documentation.

Changes since v2:
1. Improve the vmcoreinfo document, add more descripts for these
variables exported.
2. Fix spelling errors in the document.

Changes since v3:
1. Still improve the vmcoreinfo document, and make it become more
clear and easy to read.
2. Move sme_mask comments in the code to the vmcoreinfo document.
3. Improve patch log.

Changes since v4:
1. Remove a command that dumping the VMCOREINFO contents from this
   document.
2. Merge the 'PG_buddy' and 'PG_offline' into the PG_* flag in this
   document.
3. Correct some of the mistakes in this document.

Changes since v5:
1. Improve patch log.

Lianbo Jiang (2):
  kdump: add the vmcoreinfo documentation
  kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo

 Documentation/kdump/vmcoreinfo.txt | 500 +++++++++++++++++++++++++++++
 arch/x86/kernel/machine_kexec_64.c |   3 +
 2 files changed, 503 insertions(+)
 create mode 100644 Documentation/kdump/vmcoreinfo.txt

-- 
2.17.1


^ permalink raw reply	[flat|nested] 25+ messages in thread

end of thread, other threads:[~2019-01-15 11:00 UTC | newest]

Thread overview: 25+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-01-10 12:19 [PATCH 0/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo Lianbo Jiang
2019-01-10 12:19 ` [PATCH 1/2 v6] kdump: add the vmcoreinfo documentation Lianbo Jiang
2019-01-11 12:33   ` Borislav Petkov
2019-01-14  1:52     ` lijiang
2019-01-14  9:10       ` Borislav Petkov
2019-01-14 17:48     ` Kazuhito Hagio
2019-01-14 18:01       ` Borislav Petkov
2019-01-14 18:58         ` Dave Anderson
2019-01-14 19:21           ` Borislav Petkov
2019-01-14 19:36             ` Dave Anderson
2019-01-14 19:59               ` Borislav Petkov
2019-01-14 20:07                 ` Dave Anderson
2019-01-14 20:18                   ` Borislav Petkov
2019-01-14 20:26                     ` Dave Anderson
2019-01-14 20:35                       ` Borislav Petkov
2019-01-14 20:49                         ` Dave Anderson
2019-01-15 10:06                           ` Borislav Petkov
2019-01-15 11:00                           ` lijiang
2019-01-11 14:56   ` Borislav Petkov
2019-01-14  5:30     ` lijiang
2019-01-14  9:15       ` Borislav Petkov
2019-01-15  9:41         ` lijiang
2019-01-15 10:09   ` [tip:x86/kdump] kdump: Document kernel data exported in the vmcoreinfo note tip-bot for Lianbo Jiang
2019-01-10 12:19 ` [PATCH 2/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo Lianbo Jiang
2019-01-11 15:15   ` [tip:x86/kdump] x86/kdump: Export the SME " tip-bot for Lianbo Jiang

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