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Mon, 8 Jun 2026 12:51:44 +0000 (GMT) Date: Mon, 8 Jun 2026 14:51:42 +0200 From: Steffen Eiden To: Claudio Imbrenda Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, david@kernel.org, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com Subject: Re: [PATCH v1 2/3] KVM: s390: Add capability to support 2G hugepages Message-ID: <20260608125142.100035-E-seiden@linux.ibm.com> References: <20260603154758.234768-1-imbrenda@linux.ibm.com> <20260603154758.234768-3-imbrenda@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260603154758.234768-3-imbrenda@linux.ibm.com> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=HppG3UTS c=1 sm=1 tr=0 ts=6a26bae5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=kj9zAlcOel0A:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=4-Kizkfy_kV8THoGgC0A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: Z9a0eGC7JfXKZw9qN3yIEQPfuY3YznoV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA4MDExOSBTYWx0ZWRfX39sicRsMCSpq QJ0rDLQqB+gqVi7wpIrdMAdOE2em0dLcOndmyKM1vCXhUz6oXs8fob6fm6dhfKnnxdCQlGBUYFh 7gIOqwg1fHdn3Be1/k2q3w8Fy4vpGEtAiHo2rW3cLkKLs0W6mBsZNa4gCwe5PMAPbsdPMKdmY+j s0gGIs8JkJ5kx8Rghww+Y6EAvwZTb92sRot7SNEuFFOJc9LYPwZT/uofDta9Vg5DyO+HAGX6fnp bjspKONkkeZJj1zXUhK0YmOCB16WFvipKl5e2vWyNgG6mKl+c/zIwK/JxCtE5cnF6orxpHu6d+7 wTqCuOc4gHFbv2mXU9KLTBuhxT46QIRRoa2qRna7zT/+yPJAKfWwY6SPvajP5q9oTUGwBysgdKc 0liqmU2IbXHGPzFxzEHd6MLp2T00+gI6wcqdWYpDY5Ld7U9AaOxBkrV+6Up9MtIMbra5CEETprg HtW8eI9rF/jWMByZ6iQ== X-Proofpoint-ORIG-GUID: Z9a0eGC7JfXKZw9qN3yIEQPfuY3YznoV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-08_03,2026-06-05_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 phishscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606080119 On Wed, Jun 03, 2026 at 05:47:57PM +0200, Claudio Imbrenda wrote: > Add KVM_CAP_S390_HPAGE_2G to signal to userspace that 2G hugepages may > be used to back the guest; restrictions apply similar to 1M hugepages. > > Enable the (for now still ignored) GMAP_FLAG_ALLOW_HPAGE_2G flag for > the guest gmap, and propagate / disable it as necessary. > > Signed-off-by: Claudio Imbrenda Reviewed-by: Steffen Eiden