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    Contents of /trunk/kernel26-xen/patches-2.6.25-r1/1093-2.6.25-xen-Use-__KERNEL_DS-as-SS-when-returning-to-a-kernel-thr.patch

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    Revision 606 - (show annotations) (download)
    Thu May 22 23:13:13 2008 UTC (15 years, 11 months ago) by niro
    File size: 1194 byte(s) 
    -ver bump to 2.6.25-magellan-r1:
- linux-2.6.25.4
- fbcondecor-0.9.4
- squashfs-3.3
- unionfs-2.3.3
- tuxonice-3.0-rc7
- linux-phc-0.3.0
- acpi-dstd-0.9a
- reiser4
- xen-3.2.0
. ipw3945-1.2.2
    1 From 480c680899ff2e22897fc8fea1c7ca9c53315649 Mon Sep 17 00:00:00 2001
    2 From: Eduardo Habkost <ehabkost@redhat.com>
    3 Date: Fri, 4 Jan 2008 11:35:15 -0200
    4 Subject: [PATCH] Use __KERNEL_DS as SS when returning to a kernel thread (VERIFY)
    5
    6 This is needed when the kernel is running on RING3, such as under Xen.
    7 x86_64 has a weird feature that makes it #GP on iret when SS is a null
    8 descriptor.
    9
    10 This need to be tested on bare metal to make sure it doesn't cause any
    11 problems. AMD specs say SS is always ignored (except on iret?).
    12
    13 Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
    14 ---
    15 arch/x86/kernel/entry_64.S | 3 ++-
    16 1 files changed, 2 insertions(+), 1 deletions(-)
    17
    18 diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
    19 index db76caa..9f31c00 100644
    20 --- a/arch/x86/kernel/entry_64.S
    21 +++ b/arch/x86/kernel/entry_64.S
    22 @@ -104,7 +104,8 @@ ENTRY(native_irq_enable_syscall_ret)
    23 .macro FAKE_STACK_FRAME child_rip
    24 /* push in order ss, rsp, eflags, cs, rip */
    25 xorl %eax, %eax
    26 - pushq %rax /* ss */
    27 + /*FIXME: check if this causes problems on bare metal */
    28 + pushq $__KERNEL_DS /* ss */
    29 CFI_ADJUST_CFA_OFFSET 8
    30 /*CFI_REL_OFFSET ss,0*/
    31 pushq %rax /* rsp */
    32 --
    33 1.5.4.1
    34