Commit ad06ef0e authored by Alex Bennée's avatar Alex Bennée
Browse files

util: add qemu_get_host_physmem utility function 



This will be used in a future patch. For POSIX systems _SC_PHYS_PAGES
isn't standardised but at least appears in the man pages for
Open/FreeBSD. The result is advisory so any users of it shouldn't just
fail if we can't work it out.

The win32 stub currently returns 0 until someone with a Windows system
can develop and test a patch.

Signed-off-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Message-Id: <20200724064509.331-5-alex.bennee@linaro.org>
parent 7d2d6522

include/qemu/osdep.h

+12 −0
Original line number Diff line number Diff line
@@ -668,4 +668,16 @@ static inline void qemu_reset_optind(void) 
 */

char *qemu_get_host_name(Error **errp);



/**

 * qemu_get_host_physmem:

 *

 * Operating system agnostic way of querying host memory.

 *

 * Returns amount of physical memory on the system. This is purely

 * advisery and may return 0 if we can't work it out. At the other

 * end we saturate to SIZE_MAX if you are lucky enough to have that

 * much memory.

 */

size_t qemu_get_host_physmem(void);



#endif

util/oslib-posix.c

+15 −0
Original line number Diff line number Diff line
@@ -841,3 +841,18 @@ char *qemu_get_host_name(Error **errp) 


    return g_steal_pointer(&hostname);

}



size_t qemu_get_host_physmem(void)

{

#ifdef _SC_PHYS_PAGES

    long pages = sysconf(_SC_PHYS_PAGES);

    if (pages > 0) {

        if (pages > SIZE_MAX / qemu_real_host_page_size) {

            return SIZE_MAX;

        } else {

            return pages * qemu_real_host_page_size;

        }

    }

#endif

    return 0;

}

util/oslib-win32.c

+6 −0
Original line number Diff line number Diff line
@@ -828,3 +828,9 @@ char *qemu_get_host_name(Error **errp) 


    return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);

}



size_t qemu_get_host_physmem(void)

{

    /* currently unimplemented */

    return 0;

}