Boris Ostrovsky 5fdf5d37f4 x86/xen: Avoid fast syscall path for Xen PV guests ... After 32-bit syscall rewrite, and specifically after commit: 5f310f739b ("x86/entry/32: Re-implement SYSENTER using the new C path") ... the stack frame that is passed to xen_sysexit is no longer a "standard" one (i.e. it's not pt_regs). Since we end up calling xen_iret from xen_sysexit we don't need to fix up the stack and instead follow entry_SYSENTER_32's IRET path directly to xen_iret. We can do the same thing for compat mode even though stack does not need to be fixed. This will allow us to drop usergs_sysret32 paravirt op (in the subsequent patch) Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Borislav Petkov <bp@suse.de> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: david.vrabel@citrix.com Cc: konrad.wilk@oracle.com Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1447970147-1733-2-git-send-email-boris.ostrovsky@oracle.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-11-23 10:48:16 +01:00
..
boot	kasan: move KASAN_SANITIZE in arch/x86/boot/Makefile	2015-11-05 19:34:48 -08:00
configs	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-09-04 15:49:32 -07:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2015-11-04 09:11:12 -08:00
entry	x86/xen: Avoid fast syscall path for Xen PV guests	2015-11-23 10:48:16 +01:00
ia32	Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 21:05:40 -08:00
include	x86/xen: Avoid fast syscall path for Xen PV guests	2015-11-23 10:48:16 +01:00
kernel	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-22 12:00:12 -08:00
kvm	Four changes:	2015-11-12 14:34:06 -08:00
lguest	genirq: Remove irq argument from irq flow handlers	2015-09-16 15:47:51 +02:00
lib	Linux 4.3-rc1	2015-09-13 11:25:35 +02:00
math-emu	Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 21:05:40 -08:00
mm	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-22 12:00:12 -08:00
net	ebpf: migrate bpf_prog's flags to bitfield	2015-10-03 05:02:39 -07:00
oprofile
pci	PCI changes for the v4.4 merge window:	2015-11-06 11:29:53 -08:00
platform	Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 21:33:18 -08:00
power	x86/ldt: Make modify_ldt synchronous	2015-07-31 10:23:23 +02:00
purgatory
ras	x86/ras/mce_amd_inj: Inject bank 4 errors on the NBC	2015-10-12 16:15:48 +02:00
realmode
tools
um	Merge branch 'for-linus-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml	2015-11-10 16:33:37 -08:00
video
xen	x86/xen: Avoid fast syscall path for Xen PV guests	2015-11-23 10:48:16 +01:00
.gitignore
Kbuild	x86/asm/entry, x86/vdso: Move the vDSO code to arch/x86/entry/vdso/	2015-06-03 18:51:37 +02:00
Kconfig	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 18:59:10 -08:00
Kconfig.cpu	x86/Kconfig/cpus: Fix/complete CPU type help texts	2015-10-21 11:12:56 +02:00
Kconfig.debug	x86: don't make DEBUG_WX default to 'y' even with DEBUG_RODATA	2015-11-06 09:12:41 -08:00
Makefile	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2015-11-04 09:11:12 -08:00
Makefile_32.cpu
Makefile.um