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util: add qemu_get_host_physmem utility function

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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: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard 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>
This commit is contained in:
Alex Bennée 2020-07-24 07:44:57 +01:00
parent 7d2d6522bb
commit ad06ef0efb
3 changed files with 33 additions and 0 deletions
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15
util/oslib-posix.c
View file

@ -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;
}