[Xen-devel] [PATCH v1 1/4] x86/microcode: Improve documentation for ucode=

[Eslam Elnikety <elnikety@xxxxxxxxxx>]

Specify applicability and the default value. Also state that, in case of
EFI, the microcode update blob specified in the EFI cfg takes precedence
over `ucode=scan`, if the latter is specified on Xen commend line.

No functional changes.

Signed-off-by: Eslam Elnikety <elnikety@xxxxxxxxxx>
---
 docs/misc/xen-command-line.pandoc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/docs/misc/xen-command-line.pandoc 
b/docs/misc/xen-command-line.pandoc
index 981a5e2381..ebec6d387e 100644
--- a/docs/misc/xen-command-line.pandoc
+++ b/docs/misc/xen-command-line.pandoc
@@ -2134,7 +2134,12 @@ logic applies:
 ### ucode (x86)
 > `= List of [ <integer> | scan=<bool>, nmi=<bool> ]`
 
-Specify how and where to find CPU microcode update blob.
+    Applicability: x86
+    Default: `nmi`
+
+Controls for CPU microcode loading. For early loading, this parameter can
+specify how and where to find the microcode update blob. For late loading,
+this parameter specifies if the update happens within a NMI handler.
 
 'integer' specifies the CPU microcode update blob module index. When positive,
 this specifies the n-th module (in the GrUB entry, zero based) to be used
@@ -2152,6 +2157,7 @@ image that contains microcode. Depending on the platform 
the blob with the
 microcode in the cpio name space must be:
   - on Intel: kernel/x86/microcode/GenuineIntel.bin
   - on AMD  : kernel/x86/microcode/AuthenticAMD.bin
+If EFI boot, the `ucode=<filename>` config takes precendence over `scan`.
 
 'nmi' determines late loading is performed in NMI handler or just in
 stop_machine context. In NMI handler, even NMIs are blocked, which is
-- 
2.17.1


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