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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191024120938.11237-10-david@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=868 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040215 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=967 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040215 X-Mailman-Approved-At: Tue, 05 Nov 2019 11:54:16 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, Michal Hocko , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , kvm@vger.kernel.org, Pavel Tatashin , KarimAllah Ahmed , Dave Hansen , Alexander Duyck , Michal Hocko , linux-mm@kvack.org, Paul Mackerras , "H. Peter Anvin" , Wanpeng Li , Alexander Duyck , "K. Y. Srinivasan" , Thomas Gleixner , Kees Cook , devel@driverdev.osuosl.org, Stefano Stabellini , Stephen Hemminger , "Aneesh Kumar K.V" , Joerg Roedel , x86@kernel.org, YueHaibing , "Matthew Wilcox \(Oracle\)" , Mike Rapoport , Peter Zijlstra , Ingo Molnar , Vlastimil Babka , Anthony Yznaga , Oscar Salvador , "Isaac J. Manjarres" , Matt Sickler , Juergen Gross , Anshuman Khandual , Haiyang Zhang , Sasha Levin , kvm-ppc@vger.kernel.org, Qian Cai , Alex Williamson , Mike Rapoport , Borislav Petkov , Nicholas Piggin , Andy Lutomirski , xen-devel@lists.xenproject.org, Dan Williams , Vitaly Kuznetsov , Allison Randal , Jim Mattson , Mel Gorman , Cornelia Huck , Pavel Tatashin , Sean Christopherson , Johannes Weiner , Paolo Bonzini , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/24/19 8:09 AM, David Hildenbrand wrote: > diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c > index 4f2e78a5e4db..af69f057913a 100644 > --- a/drivers/xen/balloon.c > +++ b/drivers/xen/balloon.c > @@ -374,6 +374,13 @@ static void xen_online_page(struct page *page, unsigned int order) > mutex_lock(&balloon_mutex); > for (i = 0; i < size; i++) { > p = pfn_to_page(start_pfn + i); > + /* > + * TODO: The core used to mark the pages reserved. Most probably > + * we can stop doing that now. However, especially > + * alloc_xenballooned_pages() left PG_reserved set > + * on pages that can get mapped to user space. > + */ > + __SetPageReserved(p); I suspect this is not needed. Pages can get into balloon either from here or from non-hotplug path (e.g. decrease_reservation()) and so when we get a page from the balloon we would get a random page that may or may not have Reserved bit set. -boris > balloon_append(p); > } > mutex_unlock(&balloon_mutex); >