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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1731919073; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BFAzC/3A8VNELRadQtvx21DMF/FHqh9bzHESjVSr+tw=; b=HLWu/VUyIHlp20pk+e89UAGWWglHPvutouo5BzzgZ/17RDx6whZw1Gbz0II4NHL8xqDqFp t8z4QxNVH3VGfiwUUADvGwH9EmF1/AcOfaYM5Q5Wfz9dYf442Vn517Cc9JVvJnWi7C2Pgi FEhl05wqEgLjfX3LVM+2P59bPVgSYJA= X-MC-Unique: AWsNTAW4PlyJaXdnTyh_IQ-1 X-Mimecast-MFC-AGG-ID: AWsNTAW4PlyJaXdnTyh_IQ From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , =?UTF-8?q?Corvin=20K=C3=B6hne?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PULL 2/3] vfio/igd: fix calculation of graphics stolen memory Date: Mon, 18 Nov 2024 09:37:36 +0100 Message-ID: <20241118083737.174219-3-clg@redhat.com> In-Reply-To: <20241118083737.174219-1-clg@redhat.com> References: <20241118083737.174219-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.141, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1731919168961116600 From: Corvin K=C3=B6hne When copying the calculation of the stolen memory size for Intels integrated graphics device of gen 9 and later from the Linux kernel [1], we missed subtracting 0xf0 from the graphics mode select value for values above 0xf0. This leads to QEMU reporting a very large size of the graphics stolen memory area. That's just a waste of memory. Additionally the guest firmware might = be unable to allocate such a large buffer. [1] https://github.com/torvalds/linux/blob/7c626ce4bae1ac14f60076d00eafe71a= f30450ba/arch/x86/kernel/early-quirks.c#L455-L460 Signed-off-by: Corvin K=C3=B6hne Reviewed-by: Philippe Mathieu-Daud=C3=A9 Fixes: 871922416683 ("vfio/igd: correctly calculate stolen memory size for = gen 9 and later") Reviewed-by: Alex Williamson [ clg: Changed commit subject ] Signed-off-by: C=C3=A9dric Le Goater --- hw/vfio/igd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c index c5282827ec9112be3c53fbef953abed0bac64298..4047f4f0717f82f48f8e255873f= 9895a157e210a 100644 --- a/hw/vfio/igd.c +++ b/hw/vfio/igd.c @@ -501,7 +501,7 @@ static int igd_get_stolen_mb(int gen, uint32_t gmch) if (gms < 0xf0) return gms * 32; else - return gms * 4 + 4; + return (gms - 0xf0) * 4 + 4; } } =20 --=20 2.47.0