On 04/26/2011 06:13 PM, Takuya Yoshikawa wrote:
> Please post a simple patch that uses two get_user()s for that case > (64-bit pte on 32-bit host). Then work with the x86 tree to see if > they'll accept 64-bit get_user(), and once they do, we can go back to a > simple get_user() again. > > btw, I think we can use __get_user() here since the address must have > been already validated. Yes, I thought that at first. But don't we need to care KVM's address translation bugs?
It's a pity to do a runtime check when we can do a setup time check instead. So let's review the setup code and then use __get_user().
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