linux/arch/ia64
Tony Luck 4dcc29e157 [IA64] Workaround for RSE issue
Problem: An application violating the architectural rules regarding
operation dependencies and having specific Register Stack Engine (RSE)
state at the time of the violation, may result in an illegal operation
fault and invalid RSE state.  Such faults may initiate a cascade of
repeated illegal operation faults within OS interruption handlers.
The specific behavior is OS dependent.

Implication: An application causing an illegal operation fault with
specific RSE state may result in a series of illegal operation faults
and an eventual OS stack overflow condition.

Workaround: OS interruption handlers that switch to kernel backing
store implement a check for invalid RSE state to avoid the series
of illegal operation faults.

The core of the workaround is the RSE_WORKAROUND code sequence
inserted into each invocation of the SAVE_MIN_WITH_COVER and
SAVE_MIN_WITH_COVER_R19 macros.  This sequence includes hard-coded
constants that depend on the number of stacked physical registers
being 96.  The rest of this patch consists of code to disable this
workaround should this not be the case (with the presumption that
if a future Itanium processor increases the number of registers, it
would also remove the need for this patch).

Move the start of the RBS up to a mod32 boundary to avoid some
corner cases.

The dispatch_illegal_op_fault code outgrew the spot it was
squatting in when built with this patch and CONFIG_VIRT_CPU_ACCOUNTING=y
Move it out to the end of the ivt.

Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-05-27 13:24:39 -07:00
..
configs [IA64] move defconfig to arch/ia64/configs/ 2008-03-04 14:19:06 -08:00
dig
hp tty: The big operations rework 2008-04-30 08:29:47 -07:00
ia32 [IA64] fix personality(PER_LINUX32) performance issue 2008-05-15 09:54:19 -07:00
kernel [IA64] Workaround for RSE issue 2008-05-27 13:24:39 -07:00
kvm KVM: ia64: fix GVMM module including position-dependent objects 2008-05-18 14:34:16 +03:00
lib
mm [IA64] fix personality(PER_LINUX32) performance issue 2008-05-15 09:54:19 -07:00
oprofile
pci PCI: ia64: use generic pci_enable_resources() 2008-04-20 21:47:05 -07:00
scripts
sn ia64: use non-racy method for proc entries creation 2008-04-29 08:06:21 -07:00
uv [IA64] machvec support for SGI UV platform 2008-05-14 14:22:04 -07:00
install.sh
Kconfig [IA64] machvec support for SGI UV platform 2008-05-14 14:22:04 -07:00
Kconfig.debug
Makefile [IA64] machvec support for SGI UV platform 2008-05-14 14:22:04 -07:00
module.lds