[Xen-changelog] [xen master] xen: arm: further clarify the requirement for cached mappings

[patchbot@xxxxxxx]

commit 41fbf77bc87c79ae0b7dab2c47b8864c5dd34fb3
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Thu Dec 19 10:08:39 2013 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Dec 19 11:28:33 2013 +0000

    xen: arm: further clarify the requirement for cached mappings
    
    We need to include all shared memory, including grant table mappings etc
    in this statement.
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/include/public/arch-arm.h |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index ef6217d..2e7fb3e 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -59,10 +59,17 @@
  * used regardless of guest type. Structures which are passed as
  * hypercall arguments are always little endian.
  *
- * All hypercall arguments passed via a pointer to guest memory must
- * reside in memory which is mapped as Normal Inner-cacheable. Any
- * Inner cache allocation strategy (Write-Back, Write-Through etc) is
- * acceptable. There is no restriction on the Outer-cacheability.
+ * All memory which is shared with other entities in the system
+ * (including the hypervisor and other guests) must reside in memory
+ * which is mapped as Normal Inner-cacheable. This applies to:
+ *  - hypercall arguments passed via a pointer to guest memory.
+ *  - memory shared via the grant table mechanism (including PV I/O
+ *    rings etc).
+ *  - memory shared with the hypervisor (struct shared_info, struct
+ *    vcpu_info, the grant table, etc).
+ *
+ * Any Inner cache allocation strategy (Write-Back, Write-Through etc)
+ * is acceptable. There is no restriction on the Outer-cacheability.
  */
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

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