Re: [RFC PATCH 3/3] boot bzImages under paravirt

[Jeremy Fitzhardinge]

H. Peter Anvin wrote:
> In 32-bit mode?  Surely you're joking, Mr. Feynman!
>   

Right, yes.

> What's worse, reloading segments here might be highly unsafe, if the
> memory previously occupied by the GDT has been overwritten.  Keep in
> mind the GDT is touched on a segment *load*, not on a segment *access*;
> in areas such as booting that can be a huge difference.
>   

Yep, suits me.  I'm happy for the code to assume that at least %cs and
%ds are sane; I guess %ss too.  We could copy %ds into %[efg]s if we
want to be sure (since I could imagine a bootloader leaving them in a
less defined state).

But if the gdt could be missing altogether, then, yes, we should not
touch them at all.

    J
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/