From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 20 Apr 2009 05:14:00 +0000 (-0600)
Subject: lguest: fix guest crash on non-linear addresses in gdt pvops
X-Git-Tag: v2.6.30-rc3~45^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a489f0b555b753f9df8ddc24c7e74f657ef7ee7b;p=pandora-kernel.git

lguest: fix guest crash on non-linear addresses in gdt pvops

Fixes guest crash 'lguest: bad read address 0x4800000 len 256'

The new per-cpu allocator ends up handing a non-linear address to
write_gdt_entry.  We do __pa() on it, and hand it to the host, which
kills us.

I've long wanted to make the hypercall "LOAD_GDT_ENTRY" to match the IDT
code, but had no pressing reason until now.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: lguest@ozlabs.org
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