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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181107170100.9435-1-jgross@suse.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB X-ClientProxiedBy: AMSPEX02CAS01.citrite.net (10.69.22.112) To AMSPEX02CL02.citrite.net (10.69.22.126) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/11/18 17:01, Juergen Gross wrote: > Commit 9da3f2b7405440 ("x86/fault: BUG() when uaccess helpers fault on > kernel addresses") introduced a regression for booting Xen PV guests. > > Xen PV guests are using __put_user() and __get_user() for accessing the > p2m map (physical to machine frame number map) as accesses might fail > in case of not populated areas of the map. > > With above commit using __put_user() and __get_user() for accessing > kernel pages is no longer valid. So replace the Xen hack by adding > appropriate p2m access functions using the default fixup handler. > > Fixes: 9da3f2b7405440 ("x86/fault: BUG() when uaccess helpers fault on kernel addresses") > Signed-off-by: Juergen Gross Reviewed-by: Andrew Cooper