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x86/msr: Document the I/O-like write semantics in the msr driver

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Explain why msr_write() does not advance the index.

  [ bp: Massage commit message. ]

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260629173759.1770596-1-twiederh@redhat.com
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Tim Wiederhake 2026-06-29 19:37:59 +02:00 committed by Borislav Petkov (AMD)
parent cdb4d57c3e
commit b096d79bc1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/msr.c
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@ -13,6 +13,9 @@
* and then read/write in chunks of 8 bytes. A larger size means multiple
* reads or writes of the same register.
*
* Writing the same register multiple times can be useful for MSRs with
* I/O-like semantics, e.g. a virtual MSR that accepts logging information.
*
* This driver uses /dev/cpu/%d/msr where %d is the minor number, and on
* an SMP box will direct the access to CPU %d.
*/