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authorH. Peter Anvin <hpa@zytor.com>2009-04-13 19:43:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-04-13 19:43:35 -0700
commitdae8d6496ecd8afefc5e0bd6543c97f24282804f (patch)
tree90405386413aa83e690b608aba815082a09df5fc /doc
parent4c02b034c291c2a7dd5975f9140513e9b54c1be5 (diff)
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doc: add note about KVM restriction on CS.base
Add note about KVM restrictions on CS.base before entering real mode. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'doc')
-rw-r--r--doc/comboot.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/comboot.txt b/doc/comboot.txt
index 9c81c489..68f1e7e7 100644
--- a/doc/comboot.txt
+++ b/doc/comboot.txt
@@ -947,7 +947,9 @@ AX=0024h [3.80] Cleanup, shuffle and boot, raw version
For mode 0 (16-bit real mode), EAX will contain CR0 with bit 0
masked out, suitable for loading into CR0 to immediately enter
- real mode.
+ real mode. Note: if real-mode entry is planned,
+ (CS.base & 0xfff0000f) == 0 for compatibility with KVM, and
+ possibly other virtualization solutions.
In both mode 0 and mode 1, the data segments will be loaded
with base-zero read/write segments. For mode 0, B=0 and the