Jeremy Fitzhardinge 9ec2b804e0 xen: use iret directly when possible ... Most of the time we can simply use the iret instruction to exit the kernel, rather than having to use the iret hypercall - the only exception is if we're returning into vm86 mode, or from delivering an NMI (which we don't support yet). When running native, iret has the behaviour of testing for a pending interrupt atomically with re-enabling interrupts. Unfortunately there's no way to do this with Xen, so there's a window in which we could get a recursive exception after enabling events but before actually returning to userspace. This causes a problem: if the nested interrupt causes one of the task's TIF_WORK_MASK flags to be set, they will not be checked again before returning to userspace. This means that pending work may be left pending indefinitely, until the process enters and leaves the kernel again. The net effect is that a pending signal or reschedule event could be delayed for an unbounded amount of time. To deal with this, the xen event upcall handler checks to see if the EIP is within the critical section of the iret code, after events are (potentially) enabled up to the iret itself. If its within this range, it calls the iret critical section fixup, which adjusts the stack to deal with any unrestored registers, and then shifts the stack frame up to replace the previous invocation. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>		2007-07-18 08:47:46 -07:00
..
acpi	Remove some unused variables	2007-07-03 18:27:53 -07:00
cpu	HOTPLUG: Adapt thermal throttle to CPU_DYING	2007-07-16 12:05:50 +03:00
.gitignore	[PATCH] x86: gitignore some autogenerated files for i386	2006-02-14 16:09:35 -08:00
alternative.c	Revert "[PATCH] x86: __pa and __pa_symbol address space separation"	2007-05-07 08:44:24 -07:00
apic.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
apm.c	Freezer: make kernel threads nonfreezable by default	2007-07-17 10:23:02 -07:00
asm-offsets.c	xen: use iret directly when possible	2007-07-18 08:47:46 -07:00
bootflag.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
cpuid.c	Add suspend-related notifications for CPU hotplug	2007-05-09 12:30:56 -07:00
crash_dump.c	[PATCH] kdump: read previous kernel's memory	2006-01-10 08:01:28 -08:00
crash.c	move die notifier handling to common code	2007-05-08 11:15:04 -07:00
doublefault.c	[PATCH] i386: i386 separate hardware-defined TSS from Linux additions	2007-05-02 19:27:13 +02:00
e820.c	Make definitions for struct e820entry and struct e820map consistent	2007-07-12 10:55:54 -07:00
early_printk.c
efi_stub.S	[PATCH] x86: remove unused include from efi_stub.S	2006-09-26 08:48:56 -07:00
efi.c	arch/i386/* fs/* ipc/*: mark variables with uninitialized_var()	2007-07-17 16:23:19 -04:00
entry.S	xen: use iret directly when possible	2007-07-18 08:47:46 -07:00
head.S	xen: Core Xen implementation	2007-07-18 08:47:42 -07:00
hpet.c	[PATCH] Add suspend/resume for HPET	2007-03-29 10:25:32 -07:00
i386_ksyms.c	[PATCH] i386: Convert PDA into the percpu section	2007-05-02 19:27:16 +02:00
i387.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
i8237.c	[PATCH] mmc (mainly): add "or later" clause to licence statement.	2006-10-01 00:39:23 -07:00
i8253.c	[VOYAGER] clockevents: correct boot cpu is zero assumption	2007-05-01 10:06:42 -05:00
i8259.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
init_task.c	[PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c	2006-10-02 07:57:20 -07:00
io_apic.c	Freezer: make kernel threads nonfreezable by default	2007-07-17 10:23:02 -07:00
ioport.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
irq.c	[PATCH] i386: Convert PDA into the percpu section	2007-05-02 19:27:16 +02:00
kprobes.c	Kprobes: The ON/OFF knob thru debugfs	2007-05-08 11:15:19 -07:00
ldt.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
legacy_serial.c	x86, serial: convert legacy COM ports to platform devices	2007-05-08 11:15:23 -07:00
machine_kexec.c	[PATCH] i386: Avoid overwriting the current pgd (V4, i386)	2006-09-26 10:52:38 +02:00
Makefile	i386: move common parts of smp into their own file	2007-05-15 08:54:00 -07:00
mca.c	[PATCH] i386: replace kmalloc+memset with kzalloc	2006-12-07 02:14:19 +01:00
microcode.c	microcode: fix section mismatch warning	2007-06-01 08:18:30 -07:00
module.c	[PATCH] Generic BUG for i386	2006-12-08 08:28:39 -08:00
mpparse.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
msr.c	Add suspend-related notifications for CPU hotplug	2007-05-09 12:30:56 -07:00
nmi.c	i386: speedup touch_nmi_watchdog	2007-07-17 10:23:04 -07:00
numaq.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
paravirt.c	Add a sched_clock paravirt_op	2007-07-18 08:47:42 -07:00
pci-dma.c	x86: Disable DAC on VIA bridges	2007-06-20 14:27:25 -07:00
pcspeaker.c	[PATCH] x86: Unify pcspeaker platform device code between i386/x86-64	2007-02-13 13:26:26 +01:00
process.c	make seccomp zerocost in schedule	2007-07-16 09:05:50 -07:00
ptrace.c	PTRACE_POKEDATA consolidation	2007-07-17 10:23:03 -07:00
quirks.c	Clean up E7520/7320/7525 quirk printk.	2007-07-07 13:53:13 -07:00
reboot_fixups.c	GEODE: reboot fixup for geode machines with CS5536 boards	2007-07-06 11:45:11 -07:00
reboot.c	Work around Dell E520 BIOS reboot bug	2007-06-01 08:18:28 -07:00
relocate_kernel.S	[PATCH] i386: Avoid overwriting the current pgd (V4, i386)	2006-09-26 10:52:38 +02:00
scx200.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
setup.c	paravirt: add a hook for once the allocator is ready	2007-07-18 08:47:41 -07:00
sigframe.h	[PATCH] __user annotations for pointers in i386 sigframe	2005-09-09 10:31:59 -07:00
signal.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
smp.c	paravirt: unstatic leave_mm	2007-07-18 08:47:41 -07:00
smpboot.c	paravirt: make siblingmap functions visible	2007-07-18 08:47:41 -07:00
smpcommon.c	i386: Allow smp_call_function_single() to current cpu	2007-07-16 12:05:50 +03:00
srat.c	ACPI: build fix for IBM x440 - CONFIG_X86_SUMMIT	2007-02-02 21:47:33 -05:00
summit.c
sys_i386.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
syscall_table.S	signal/timer/event: eventfd wire up x86 arches	2007-05-11 08:29:37 -07:00
sysenter.c	[PATCH] i386: In compat mode, the return value here was uninitialized.	2007-05-02 19:27:16 +02:00
time.c	[PATCH] i386: pit_latch_buggy has no effect	2007-05-02 19:27:05 +02:00
topology.c	Replace remaining references to "driverfs" with "sysfs".	2007-02-17 19:13:42 +01:00
trampoline.S	[PATCH] i386: Rename boot_gdt_table to boot_gdt	2007-05-02 19:27:10 +02:00
traps.c	Report that kernel is tainted if there was an OOPS	2007-07-17 10:23:02 -07:00
tsc_sync.c	[PATCH] x86: rewrite SMP TSC sync code	2007-02-16 08:13:57 -08:00
tsc.c	Add a sched_clock paravirt_op	2007-07-18 08:47:42 -07:00
vm86.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
vmi.c	Add a sched_clock paravirt_op	2007-07-18 08:47:42 -07:00
vmiclock.c	Add a sched_clock paravirt_op	2007-07-18 08:47:42 -07:00
vmlinux.lds.S	xen: Core Xen implementation	2007-07-18 08:47:42 -07:00
vsyscall-int80.S
vsyscall-note.S	Add nosegneg capability to the vsyscall page notes	2007-07-18 08:47:42 -07:00
vsyscall-sigreturn.S	[PATCH] Mark unwind info for signal trampolines in vDSOs	2006-03-31 12:18:52 -08:00
vsyscall-sysenter.S	[PATCH] vdso: randomize the i386 vDSO by moving it into a vma	2006-06-27 17:32:38 -07:00
vsyscall.lds.S	[PATCH] i386: VDSO_PRELINK warning fix	2007-05-02 19:27:09 +02:00
vsyscall.S