From: "Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: BUG: fbback doesn't unmap pages on disconnect
Date: Wed, 18 Dec 2013 16:14:50 +0100 [thread overview]
Message-ID: <52B1BBEA.8010404@gmail.com> (raw)
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./tools/qemu-xen-traditional-dir-remote/hw/xenfb.c:
/*
* FIXME: qemu can't un-init gfx display (yet?).
* Replacing the framebuffer with anonymous shared memory
* instead. This releases the guest pages and keeps qemu happy.
*/
fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
-1, 0);
Well it doesn't unmap. There is no unmap on this code path. And since
the mapping is read-write the pages which are supposed to be released,
are now not usable for holding paging table anymore. Can anyone suggest
a workaround to munmap those pages? Could this bug be fixed?
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next reply other threads:[~2013-12-18 15:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-18 15:14 Vladimir 'φ-coder/phcoder' Serbinenko [this message]
2013-12-20 10:03 ` BUG: fbback doesn't unmap pages on disconnect George Dunlap
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