Boris Ostrovsky 91e2eea98f 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> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2015-12-19 09:55:52 +01:00
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alpha
arc
arm	KVM/ARM fixes for v4.4-rc4	2015-12-04 10:17:20 -08:00
arm64	KVM/ARM fixes for v4.4-rc4	2015-12-04 10:17:20 -08:00
avr32
blackfin
c6x
cris
frv
h8300
hexagon
ia64
m32r
m68k
metag
microblaze
mips	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2015-11-29 17:24:35 -08:00
mn10300	mn10300: Select CONFIG_HAVE_UID16 to fix build failure	2015-11-30 07:01:40 -08:00
nios2	nios2: fix cache coherency	2015-11-26 22:25:58 +08:00
openrisc
parisc
powerpc
s390
score
sh
sparc
tile
um	um: fix returns without va_end	2015-12-08 22:26:00 +01:00
unicore32
x86	x86/xen: Avoid fast syscall path for Xen PV guests	2015-12-19 09:55:52 +01:00
xtensa
.gitignore
Kconfig