From nobody Thu Oct 2 03:22:59 2025 Delivered-To: importer@patchew.org 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; Authentication-Results: mx.zohomail.com; dkim=fail; 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 ARC-Seal: i=1; a=rsa-sha256; t=1584439903; cv=none; d=zohomail.com; s=zohoarc; b=atwoCEAABRcpa1O0VMd3T1JQi61+IgsQLYiophoJLxhyWjuRwfzITiy7Z2Do/9G6pMHGUfKIgZ4yPszBAcvArAB0/I1FKGqaJ9oEb1kiAdtxAjOngYrUHJ+XNtoVVwRxAXtFHiRSfU1XBwW1GUHQEBVJ5NfVEAHQuHEKzS1tkvw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1584439903; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=c/mEKgl4NVafK8fJFMAP4mZYSI/dUNQB1Tcii52sZNI=; b=d1qfPMM1SZEhqBQMXOdMNi7ccFextV7lvqNnzMVTE5hW23K6DgmmVnR3XITiWxGU3ElBB8yInRhpIXVs2mWlM8GTGn/RmNi0boUnr/NpTh36aszy8yBjD3c2bB2Jy32GAVnuNKw6nzYxEH89mcGB1wxMtlyy+C50ddmz/G5JmC0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; 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 1584439903618276.51526623792347; Tue, 17 Mar 2020 03:11:43 -0700 (PDT) Received: from localhost ([::1]:55618 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jE9CI-0005OO-Fr for importer@patchew.org; Tue, 17 Mar 2020 06:11:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45007) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jE95a-0000lq-UM for qemu-devel@nongnu.org; Tue, 17 Mar 2020 06:04:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jE95Z-0001jB-Hg for qemu-devel@nongnu.org; Tue, 17 Mar 2020 06:04:46 -0400 Received: from bilbo.ozlabs.org ([2401:3900:2:1::2]:54747 helo=ozlabs.org) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jE95Z-0001GI-6D; Tue, 17 Mar 2020 06:04:45 -0400 Received: by ozlabs.org (Postfix, from userid 1007) id 48hTKw1c4dz9sSZ; Tue, 17 Mar 2020 21:04:36 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1584439476; bh=RZjMlsbNKA6+ViTuycxwZ7IU6OPn0vl7+MnQX6dTb5A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WYwZqVnRIl9qJBBVo+yIXb1F1PtrGwJDiksVSNUMfBB16Q2xIXN4pQsEG2CV6NUmS HJrwVBhy1YYKa3+y1BFuHE3A1L2zwel2pO1KIWeDb7aMZXMeJslSEOybMDpZu1gYPu n+gqjUUVKjNBRe3FZzoc7/hjOzfJAch/Rj5/UvD4= From: David Gibson To: peter.maydell@linaro.org Subject: [PULL 10/45] spapr, ppc: Remove VPM0/RMLS hacks for POWER9 Date: Tue, 17 Mar 2020 21:03:48 +1100 Message-Id: <20200317100423.622643-11-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200317100423.622643-1-david@gibson.dropbear.id.au> References: <20200317100423.622643-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2401:3900:2:1::2 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lvivier@redhat.com, aik@ozlabs.ru, mdroth@linux.vnet.ibm.com, qemu-devel@nongnu.org, groug@kaod.org, qemu-ppc@nongnu.org, clg@kaod.org, David Gibson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" For the "pseries" machine, we use "virtual hypervisor" mode where we only model the CPU in non-hypervisor privileged mode. This means that we need guest physical addresses within the modelled cpu to be treated as absolute physical addresses. We used to do that by clearing LPCR[VPM0] and setting LPCR[RMLS] to a high limit so that the old offset based translation for guest mode applied, which does what we need. However, POWER9 has removed support for that translation mode, which meant we had some ugly hacks to keep it working. We now explicitly handle this sort of translation for virtual hypervisor mode, so the hacks aren't necessary. We don't need to set VPM0 and RMLS from the machine type code - they're now ignored in vhyp mode. On the cpu side we don't need to allow LPCR[RMLS] to be set on POWER9 in vhyp mode - that was only there to allow the hack on the machine side. Signed-off-by: David Gibson Reviewed-by: C=C3=A9dric Le Goater Reviewed-by: Greg Kurz --- hw/ppc/spapr_cpu_core.c | 10 +--------- target/ppc/mmu-hash64.c | 8 -------- 2 files changed, 1 insertion(+), 17 deletions(-) diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index d09125d9af..36ed3a2b66 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -50,22 +50,14 @@ static void spapr_reset_vcpu(PowerPCCPU *cpu) * the settings below ensure proper operations with TCG in absence of * a real hypervisor. * - * Clearing VPM0 will also cause us to use RMOR in mmu-hash64.c for - * real mode accesses, which thankfully defaults to 0 and isn't - * accessible in guest mode. - * * Disable Power-saving mode Exit Cause exceptions for the CPU, so * we don't get spurious wakups before an RTAS start-cpu call. * For the same reason, set PSSCR_EC. */ - lpcr &=3D ~(LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_KBV | pcc->lpcr_pm= ); + lpcr &=3D ~(LPCR_VPM1 | LPCR_ISL | LPCR_KBV | pcc->lpcr_pm); lpcr |=3D LPCR_LPES0 | LPCR_LPES1; env->spr[SPR_PSSCR] |=3D PSSCR_EC; =20 - /* Set RMLS to the max (ie, 16G) */ - lpcr &=3D ~LPCR_RMLS; - lpcr |=3D 1ull << LPCR_RMLS_SHIFT; - ppc_store_lpcr(cpu, lpcr); =20 /* Set a full AMOR so guest can use the AMR as it sees fit */ diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c index e372c42add..caf47ad6fc 100644 --- a/target/ppc/mmu-hash64.c +++ b/target/ppc/mmu-hash64.c @@ -1126,14 +1126,6 @@ void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong va= l) (LPCR_PECE_L_MASK & (LPCR_PDEE | LPCR_HDEE | LPCR_EE= E | LPCR_DEE | LPCR_OEE)) | LPCR_MER | LPCR_GTSE | LPCR_= TC | LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | LPCR_HDICE); - /* - * If we have a virtual hypervisor, we need to bring back RMLS. It - * doesn't exist on an actual P9 but that's all we know how to - * configure with softmmu at the moment - */ - if (cpu->vhyp) { - lpcr |=3D (val & LPCR_RMLS); - } break; default: g_assert_not_reached(); --=20 2.24.1