Implement ACPI APEI ERST feature

APEI are ACPI4.0 new features. It consists of ERST, BERT, HEST, and
EINJ.  ERST is used to save fault error log to a platform persistent
storage, so that when reboot os can retrieve the error log and handle
it.

This patch is used to implement ERST feature to Xen.  It consists of
3-level hierarchy: operation level, action level, and instru= ction
level.  Instruction do basic io; Action done by sequential
instructions parsed from ACPI ERST table; Operation done by
sequential actions defined by ACPI spec, providing erst_write/
erst_read/ erst_clear interfaces to MCE/ NMI/ PCIe error handling
mechanism, etc.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/xen/include/xen/spinlock.h b/xen/include/xen/spinlock.h
index f6f737d756..a2d1ed99bf 100644
--- a/xen/include/xen/spinlock.h
+++ b/xen/include/xen/spinlock.h
@@ -181,6 +181,13 @@ int _rw_is_write_locked(rwlock_t *lock);
 #define spin_is_locked(l)             _spin_is_locked(l)
 #define spin_trylock(l)               _spin_trylock(l)
 
+#define spin_trylock_irqsave(lock, flags)       \
+({                                              \
+    local_irq_save(flags);                      \
+    spin_trylock(lock) ?                        \
+    1 : ({ local_irq_restore(flags); 0; });     \
+})
+
 /* Ensure a lock is quiescent between two critical operations. */
 #define spin_barrier(l)               _spin_barrier(l)
 #define spin_barrier_irq(l)           _spin_barrier_irq(l)