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linux-user: init_guest_commpage: Add a comment about size check 

Signed-off-by: Luke Shumaker <lukeshu@parabola.nu>
Message-Id: <20171228180814.9749-7-lukeshu@lukeshu.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Luke Shumaker 2017-12-28 13:08:09 -05:00 committed by Laurent Vivier
parent 293f206008
commit 955e304f6f
1 changed files with 5 additions and 0 deletions
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linux-user/elfload.c
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@ -374,6 +374,11 @@ static int init_guest_commpage(unsigned long guest_base,
/* If the commpage lies within the already allocated guest space,
* then there is no way we can allocate it.
*
* You may be thinking that that this check is redundant because
* we already validated the guest size against MAX_RESERVED_VA;
* but if qemu_host_page_mask is unusually large, then
* test_page_addr may be lower.
*/
if (test_page_addr >= guest_base
&& test_page_addr < (guest_base + guest_size)) {