diff options
Diffstat (limited to 'docs/misc/xen-command-line.markdown')
| -rw-r--r-- | docs/misc/xen-command-line.markdown | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index 56c9729803..dc724738dd 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -897,10 +897,12 @@ pages) must also be specified via the tbuf\_size parameter. > `= unstable | skewed` ### ucode -> `= <integer>` +> `= [<integer> | scan]` + +Specify how and where to find CPU microcode update blob. -Specify the CPU microcode update blob module index. When positive, this -specifies the n-th module (in the GrUB entry, zero based) to be used +'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 for updating CPU micrcode. When negative, counting starts at the end of the modules in the GrUB entry (so with the blob commonly being last, one could specify `ucode=-1`). Note that the value of zero is not valid @@ -910,6 +912,12 @@ when used with xen.efi (there the concept of modules doesn't exist, and the blob gets specified via the `ucode=<filename>` config file/section entry; see [EFI configuration file description](efi.html)). +'scan' instructs the hypervisor to scan the multiboot images for an cpio +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 + ### unrestricted\_guest > `= <boolean>` |