The patch titled
cleanup: Initialize esp0 properly all the time
has been added to the -mm tree. Its filename is
cleanup-initialize-esp0-properly-all-the-time.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cleanup: Initialize esp0 properly all the time
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Whenever we schedule, __switch_to calls load_esp0 which does:
tss->esp0 = thread->esp0;
This is never initialized for the initial thread (ie "swapper"), so when we're
scheduling that, we end up setting esp0 to 0. This is fine: the swapper never
leaves ring 0, so this field is never used.
lguest, however, gets upset that we're trying to used an unmapped page as our
kernel stack. Rather than work around it there, let's initialize it.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-i386/processor.h | 1 +
1 file changed, 1 insertion(+)
diff -puN include/asm-i386/processor.h~cleanup-initialize-esp0-properly-all-the-time include/asm-i386/processor.h
--- a/include/asm-i386/processor.h~cleanup-initialize-esp0-properly-all-the-time
+++ a/include/asm-i386/processor.h
@@ -429,6 +429,7 @@ struct thread_struct {
};
#define INIT_THREAD { \
+ .esp0 = sizeof(init_stack) + (long)&init_stack, \
.vm86_info = NULL, \
.sysenter_cs = __KERNEL_CS, \
.io_bitmap_ptr = NULL, \
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
origin.patch
cleanup-paravirt-unhandled-fallthrough.patch
cleanup-initialize-esp0-properly-all-the-time.patch
cleanup-make-hvc_consolec-compile-on-non-powerpc.patch
cleanup-move-mce_disabled-to-asm-mceh.patch
cleanup-rename-cpu_gdt_descr-and-remove-extern.patch
cleanup-remove-extern-declaration-from.patch
cleanup-make-disable_acpi-valid-w-o-config_acpi.patch
lguest-preparation-export_symbol_gpl-5-functions.patch
lguest-preparation-expose-futex-infrastructure.patch
lguest-kconfig-and-headers.patch
lguest-the-host-code-lgko.patch
lguest-guest-code.patch
lguest-makefile.patch
lguest-trivial-guest-network-driver.patch
lguest-trivial-guest-network-driver-fix.patch
lguest-trivial-guest-console-driver.patch
lguest-trivial-guest-block-driver.patch
lguest-documentatation-and-example-launcher.patch
vmi-versus-hrtimers.patch
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