[Qemu-devel] [PATCH] Define OS-dependent qemu_getpagesize()

[Qemu-devel] [PATCH] Define OS-dependent qemu_getpagesize()

[Hollis Blanchard]

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

diff --git a/qemu/exec.c b/qemu/exec.c
--- a/qemu/exec.c
+++ b/qemu/exec.c
@@ -239,16 +239,7 @@ static void page_init(void)
 {
     /* NOTE: we can always suppose that qemu_host_page_size >=
        TARGET_PAGE_SIZE */
-#ifdef _WIN32
-    {
-        SYSTEM_INFO system_info;
-
-        GetSystemInfo(&system_info);
-        qemu_real_host_page_size = system_info.dwPageSize;
-    }
-#else
-    qemu_real_host_page_size = getpagesize();
-#endif
+    qemu_real_host_page_size = qemu_getpagesize();
     if (qemu_host_page_size == 0)
         qemu_host_page_size = qemu_real_host_page_size;
     if (qemu_host_page_size < TARGET_PAGE_SIZE)
diff --git a/qemu/osdep.c b/qemu/osdep.c
--- a/qemu/osdep.c
+++ b/qemu/osdep.c
@@ -64,6 +64,14 @@ void qemu_vfree(void *ptr)
 void qemu_vfree(void *ptr)
 {
     VirtualFree(ptr, 0, MEM_RELEASE);
+}
+
+long qemu_getpagesize(void)
+{
+    SYSTEM_INFO system_info;
+
+    GetSystemInfo(&system_info);
+    return system_info.dwPageSize;
 }
 
 #else
@@ -190,6 +198,11 @@ void *qemu_memalign(size_t alignment, si
 #endif
 }
 
+long qemu_getpagesize(void)
+{
+    return sysconf(_SC_PAGESIZE);
+}
+
 /* alloc shared memory pages */
 void *qemu_vmalloc(size_t size)
 {
diff --git a/qemu/osdep.h b/qemu/osdep.h
--- a/qemu/osdep.h
+++ b/qemu/osdep.h
@@ -72,6 +72,7 @@ void *qemu_memalign(size_t alignment, si
 void *qemu_memalign(size_t alignment, size_t size);
 void *qemu_vmalloc(size_t size);
 void qemu_vfree(void *ptr);
+long qemu_getpagesize(void);
 
 int qemu_create_pidfile(const char *filename);
 

[Qemu-devel] Allocate guest memory on host page boundaries.

[Hollis Blanchard]

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
diff --git a/osdep.c b/osdep.c
index 8ff260a..30a1263 100644
--- a/osdep.c
+++ b/osdep.c
@@ -213,7 +213,7 @@ void *qemu_vmalloc(size_t size)
 #ifdef _BSD
     return valloc(size);
 #else
-    return memalign(4096, size);
+    return memalign(qemu_getpagesize(), size);
 #endif
 }
 

Re: [Qemu-devel] [PATCH] Define OS-dependent qemu_getpagesize()

[Anthony Liguori]

Hollis Blanchard wrote:
> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
>   

Applied both.  Thanks.

In the future, please try to give better descriptions.  The change might 
be simple but it's usually hard to infer why a change is needed just 
from the code unless it's a simple bug fix.

Regards,

Anthony Liguori

Re: [Qemu-devel] [PATCH] Define OS-dependent qemu_getpagesize()

[Anthony Liguori]

Hollis Blanchard wrote:
> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
>   

This breaks the -linux-user build.

> diff --git a/qemu/exec.c b/qemu/exec.c
> --- a/qemu/exec.c
> +++ b/qemu/exec.c
> @@ -239,16 +239,7 @@ static void page_init(void)
>  {
>      /* NOTE: we can always suppose that qemu_host_page_size >=
>         TARGET_PAGE_SIZE */
> -#ifdef _WIN32
> -    {
> -        SYSTEM_INFO system_info;
> -
> -        GetSystemInfo(&system_info);
> -        qemu_real_host_page_size = system_info.dwPageSize;
> -    }
> -#else
> -    qemu_real_host_page_size = getpagesize();
> -#endif
> +    qemu_real_host_page_size = qemu_getpagesize();
>      if (qemu_host_page_size == 0)
>          qemu_host_page_size = qemu_real_host_page_size;
>      if (qemu_host_page_size < TARGET_PAGE_SIZE)
>   

This is only used by -linux-user, which does not use osdep.c.

I've reverted this changeset and changed qemu_vmalloc() to just use 
getpagesize().

Regards,

Anthony Liguori