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linux-user/x86_64: Handle the vsyscall page in open_self_maps_{2,4}
This is the only case in which we expect to have no host memory backing for a guest memory page, because in general linux user processes cannot map any pages in the top half of the 64-bit address space. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2170 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> (cherry picked from commit 4ef1f55) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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