[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] x86/microcode: improve documentation for ucode=
commit 6e73e7186dd73e8f638730135c298474f49de6a4 Author: Eslam Elnikety <elnikety@xxxxxxxxxx> AuthorDate: Fri Jan 24 10:30:54 2020 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Jan 24 10:30:54 2020 +0100 x86/microcode: improve documentation for ucode= 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> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> --- docs/misc/xen-command-line.pandoc | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line.pandoc index e0e16fbef1..5eb3a07276 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -2137,10 +2137,15 @@ logic applies: opted in to with `smt=0 spec-ctrl=md-clear`, at which point TSX will remain active by default. -### ucode (x86) +### ucode > `= 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 @@ -2158,6 +2163,8 @@ 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 +When using xen.efi, the `ucode=<filename>` config file setting takes +precedence 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 -- generated by git-patchbot for /home/xen/git/xen.git#staging _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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