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* xen: use iret for return from 64b kernel to 32b usermodeJeremy Fitzhardinge2009-12-031-2/+2
| | | | | | | | | | | | | | | If Xen wants to return to a 32b usermode with sysret it must use the right form. When using VCGF_in_syscall to trigger this, it looks at the code segment and does a 32b sysret if it is FLAT_USER_CS32. However, this is different from __USER32_CS, so it fails to return properly if we use the normal Linux segment. So avoid the whole mess by dropping VCGF_in_syscall and simply use plain iret to return to usermode. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jan Beulich <jbeulich@novell.com> Cc: Stable Kernel <stable@kernel.org>
* x86: style cleanups for xen assembliesTejun Heo2009-02-051-52/+55
| | | | | | | | | | | Make the following style cleanups: * drop unnecessary //#include from xen-asm_32.S * compulsive adding of space after comma * reformat multiline comments Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: make direct versions of irq_enable/disable/save/restore to common codeJeremy Fitzhardinge2009-02-041-131/+3
| | | | | | | | | | | | | | | | Now that x86-64 has directly accessible percpu variables, it can also implement the direct versions of these operations, which operate on a vcpu_info structure directly embedded in the percpu area. In fact, the 64-bit versions are more or less identical, and so can be shared. The only two differences are: 1. xen_restore_fl_direct takes its argument in eax on 32-bit, and rdi on 64-bit. Unfortunately it isn't possible to directly refer to the 2nd lsb of rdi directly (as you can with %ah), so the code isn't quite as dense. 2. check_events needs to variants to save different registers. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* x86-64: Move oldrsp from PDA to per-cpu.Brian Gerst2009-01-191-4/+4
| | | | | | | | | tj: * in asm-offsets_64.c, pda.h inclusion shouldn't be removed as pda is still referenced in the file * s/oldrsp/old_rsp/ Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* x86-64: Move kernelstack from PDA to per-cpu.Brian Gerst2009-01-191-12/+11
| | | | | | | | | | | Also clean up PER_CPU_VAR usage in xen-asm_64.S tj: * remove now unused stack_thread_info() * s/kernelstack/kernel_stack/ * added FIXME comment in xen-asm_64.S Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
* xen: clean up x86-64 warningsJeremy Fitzhardinge2008-10-031-3/+17
| | | | | | | | | | | There are a couple of Xen features which rely on directly accessing per-cpu data via a segment register, which is not yet available on x86-64. In the meantime, just disable direct access to the vcpu info structure; this leaves some of the code as dead, but it will come to life in time, and the warnings are suppressed. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: compile irq functions without -pg for ftraceJeremy Fitzhardinge2008-07-311-1/+1
| | | | | | | | | | | | | For some reason I managed to miss a bunch of irq-related functions which also need to be compiled without -pg when using ftrace. This patch moves them into their own file, and starts a cleanup process I've been meaning to do anyway. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: "Alex Nixon (Intern)" <Alex.Nixon@eu.citrix.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen: don't use sysret for sysexit32Jeremy Fitzhardinge2008-07-241-1/+1
| | | | | | | | | | When implementing sysexit32, don't let Xen use sysret to return to userspace. That results in usermode register state being trashed. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Mark McLoughlin <markmc@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen64: set up syscall and sysenter entrypoints for 64-bitJeremy Fitzhardinge2008-07-161-2/+127
| | | | | | | | | | | | We set up entrypoints for syscall and sysenter. sysenter is only used for 32-bit compat processes, whereas syscall can be used in by both 32 and 64-bit processes. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen64: deal with extra words Xen pushes onto exception framesJeremy Fitzhardinge2008-07-161-0/+5
| | | | | | | | | | | | | Xen pushes two extra words containing the values of rcx and r11. This pvop hook copies the words back into their appropriate registers, and cleans them off the stack. This leaves the stack in native form, so the normal handler can run unchanged. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* xen64: add 64-bit assemblerJeremy Fitzhardinge2008-07-161-0/+141
Split xen-asm into 32- and 64-bit files, and implement the 64-bit variants. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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