[Qemu-devel] [PULL 02/11] cpu-all: complete "real" host page size API

[Alex Williamson <alex.williamson@redhat.com>]

From: Peter Crosthwaite <crosthwaitepeter@gmail.com>

Currently the "host" page size alignment API is really aligning to both
host and target page sizes. There is the qemu_real_page_size which can
be used for the actual host page size but it's missing a mask and ALIGN
macro as provided for qemu_page_size. Complete the API. This allows
system level code that cares about the host page size to use a
consistent alignment interface without having to un-needingly align to
the target page size. This also reduces system level code dependency
on the cpu specific TARGET_PAGE_SIZE.

Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 include/exec/cpu-all.h |    3 +++
 translate-all.c        |    2 ++
 2 files changed, 5 insertions(+)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 8999634..ea6a9a6 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -183,10 +183,13 @@ extern unsigned long reserved_va;
 
 /* ??? These should be the larger of uintptr_t and target_ulong.  */
 extern uintptr_t qemu_real_host_page_size;
+extern uintptr_t qemu_real_host_page_mask;
 extern uintptr_t qemu_host_page_size;
 extern uintptr_t qemu_host_page_mask;
 
 #define HOST_PAGE_ALIGN(addr) (((addr) + qemu_host_page_size - 1) & qemu_host_page_mask)
+#define REAL_HOST_PAGE_ALIGN(addr) (((addr) + qemu_real_host_page_size - 1) & \
+                                    qemu_real_host_page_mask)
 
 /* same as PROT_xxx */
 #define PAGE_READ      0x0001
diff --git a/translate-all.c b/translate-all.c
index 412bc90..50d53fd 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -118,6 +118,7 @@ typedef struct PageDesc {
 #define V_L1_SHIFT (L1_MAP_ADDR_SPACE_BITS - TARGET_PAGE_BITS - V_L1_BITS)
 
 uintptr_t qemu_real_host_page_size;
+uintptr_t qemu_real_host_page_mask;
 uintptr_t qemu_host_page_size;
 uintptr_t qemu_host_page_mask;
 
@@ -307,6 +308,7 @@ void page_size_init(void)
     /* NOTE: we can always suppose that qemu_host_page_size >=
        TARGET_PAGE_SIZE */
     qemu_real_host_page_size = getpagesize();
+    qemu_real_host_page_mask = ~(qemu_real_host_page_size - 1);
     if (qemu_host_page_size == 0) {
         qemu_host_page_size = qemu_real_host_page_size;
     }