From nobody Sun Sep 28 15:58:42 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1756307695314488.1632202159594; Wed, 27 Aug 2025 08:14:55 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1urHnY-0006RL-LS; Wed, 27 Aug 2025 11:10:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1urHkM-0008Bi-I4; Wed, 27 Aug 2025 11:07:35 -0400 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1urHkK-0005eS-KR; Wed, 27 Aug 2025 11:07:34 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id A3DCB14C557; Wed, 27 Aug 2025 18:02:59 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 8C56726985E; Wed, 27 Aug 2025 18:03:26 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Glenn Miles , Nicholas Piggin , Michael Kowal , Caleb Schlossin , Gautam Menghani , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Michael Tokarev Subject: [Stable-10.0.4 46/59] ppc/xive2: Fix treatment of PIPR in CPPR update Date: Wed, 27 Aug 2025 18:02:51 +0300 Message-ID: <20250827150323.2694101-46-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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-ZM-MESSAGEID: 1756307697462116600 From: Glenn Miles According to the XIVE spec, updating the CPPR should also update the PIPR. The final value of the PIPR depends on other factors, but it should never be set to a value that is above the CPPR. Also added support for redistributing an active group interrupt when it is precluded as a result of changing the CPPR value. Signed-off-by: Glenn Miles Reviewed-by: Nicholas Piggin Reviewed-by: Michael Kowal Reviewed-by: Caleb Schlossin Tested-by: Gautam Menghani Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-11-npiggin@g= mail.com Signed-off-by: C=C3=A9dric Le Goater (cherry picked from commit d4720a7faf4bb415f3fe7f10e5c888212b81316a) Signed-off-by: Michael Tokarev diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c index 2b4d0f51be..1971c05fa1 100644 --- a/hw/intc/xive2.c +++ b/hw/intc/xive2.c @@ -995,7 +995,9 @@ static void xive2_tctx_set_cppr(XiveTCTX *tctx, uint8_t= ring, uint8_t cppr) } } } - regs[TM_PIPR] =3D pipr_min; + + /* PIPR should not be set to a value greater than CPPR */ + regs[TM_PIPR] =3D (pipr_min > cppr) ? cppr : pipr_min; =20 rc =3D xive2_tctx_get_nvp_indexes(tctx, ring_min, &nvp_blk, &nvp_idx); if (rc) { --=20 2.47.2