[Qemu-devel] [PATCH v2 06/10] target-mips: Set target page size to 16K in KVM mode

[James Hogan <james.hogan@imgtec.com>]

From: Sanjay Lal <sanjayl@kymasys.com>

With larger set associative caches KVM can open the possibility of cache
aliasing between the memory that QEMU allocates with mmap and the
mapping into the guest address space. Therefore increase the target page
size to 16K when KVM is configured.

Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
---
Changes in v2:
 - Expand commit message
---
 target-mips/mips-defs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target-mips/mips-defs.h b/target-mips/mips-defs.h
index bf094a3..473ddf8 100644
--- a/target-mips/mips-defs.h
+++ b/target-mips/mips-defs.h
@@ -5,7 +5,12 @@
 //#define USE_HOST_FLOAT_REGS
 
 /* Real pages are variable size... */
+#ifdef CONFIG_KVM
+/* For KVM/MIPS the minimum page size is 16K due to cache aliasing issues */
+#define TARGET_PAGE_BITS 14
+#else
 #define TARGET_PAGE_BITS 12
+#endif
 #define MIPS_TLB_MAX 128
 
 #if defined(TARGET_MIPS64)
-- 
1.8.1.2