Re: [PATCH v2] linux-user: Add emulation for MADV_WIPEONFORK and MADV_KEEPONFORK in madvise()

[Ilya Leoshkevich]

On Tue, Dec 13, 2022 at 06:03:09PM +0100, Helge Deller wrote:
> Both parameters have a different value on the parisc platform, so first
> translate the target value into a host value for usage in the native
> madvise() syscall.
> 
> Those parameters are often used by security sensitive applications (e.g.
> tor browser, boringssl, ...) which expect the call to return a proper
> return code on failure, so return -EINVAL if qemu fails to forward the
> syscall to the host OS.
> 
> While touching this code, enhance the comments about MADV_DONTNEED.
> 
> Tested with testcase of tor browser when running hppa-linux guest on
> x86-64 host.
> 
> Signed-off-by: Helge Deller <deller@gmx.de>
> 
> ---
> v2: based on feedback from Ilya Leoshkevich <iii@linux.ibm.com>
> - rename can_passthrough_madv_dontneed() to can_passthrough_madvise()
> - rephrase the comment about MADV_DONTNEED

Thanks!

Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>