[Xen-devel] [PATCH v2] xen/x86: add a comment regarding how to get the VCPU ID on HVM

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Add a note to the public headers regarding how to get the VCPU ID for
HVM guests (on x86).

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Acked-by: Matt Wilson <msw@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Matt Wilson <msw@xxxxxxxxxx>
---
This is what Linux PVHVM does AFAIK, and also what I've been using in
my FreeBSD PVHVM series, but it's not written anywere.
---
Changes since v1:
 * Reworded the comment as requested by Matt.
---
 xen/include/public/vcpu.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/include/public/vcpu.h b/xen/include/public/vcpu.h
index e888daf..f09367a 100644
--- a/xen/include/public/vcpu.h
+++ b/xen/include/public/vcpu.h
@@ -35,6 +35,10 @@
  * @cmd        == VCPUOP_??? (VCPU operation).
  * @vcpuid     == VCPU to operate on.
  * @extra_args == Operation-specific extra arguments (NULL if none).
+ *
+ * For x86 HVM domains that use VCPU operations the VCPU ID is the ACPI
+ * Processor ID of the CPU (not to be confused with the APIC ID), as
+ * fetched from the MADT table.
  */
 
 /*
-- 
1.7.7.5 (Apple Git-26)


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