Commit ce29a1f8 authored Sep 03, 2007 by Christian Ehrhardt Committed by H. Peter Anvin Sep 05, 2007

[x86 setup] Work around bug in Xen HVM



Apparently XEN does not keep the contents of the 48-bit gdt_48 data
structure that is passed to lgdt in the XEN machine state. Instead it
appears to save the _address_ of the 48-bit descriptor
somewhere. Unfortunately this data happens to reside on the stack and
is probably no longer availiable at the time of the actual protected
mode jump.

This is Xen bug but given that there is a one-line patch to work
around this problem, the linux kernel should probably do this.  My fix
is to make the gdt_48 description in setup_gdt static (in setup_idt
this is already the case). This allows the kernel to boot under
Xen HVM again.

Signed-off-by: Christian Ehrhardt <lk@c--e.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

parent 40ffbfad

arch/i386/boot/pm.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -122,7 +122,11 @@ static void setup_gdt(void)
		/* DS: data, read/write, 4 GB, base 0 */
		[GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff),
		};
		struct gdt_ptr gdt;
		/* Xen HVM incorrectly stores a pointer to the gdt_ptr, instead
		of the gdt_ptr contents. Thus, make it static so it will
		stay in memory, at least long enough that we switch to the
		proper kernel GDT. */
		static struct gdt_ptr gdt;

		gdt.len = sizeof(boot_gdt)-1;
		gdt.ptr = (u32)&boot_gdt + (ds() << 4);