From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 899F8C43217 for ; Wed, 2 Nov 2022 23:22:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230006AbiKBXWw (ORCPT ); Wed, 2 Nov 2022 19:22:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231158AbiKBXVb (ORCPT ); Wed, 2 Nov 2022 19:21:31 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAC2CAE6F for ; Wed, 2 Nov 2022 16:20:01 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-368036d93abso580217b3.18 for ; Wed, 02 Nov 2022 16:20:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=0o+EzHHK0qEKuJS4nAvuf1qFUtMYU5Pn7Tw+MdMbo24=; b=EIb+S3KjwEE+ZmqC6GbVJJy8amB++eLjJ+/jiG87MMc/wFbRU0kx0J4wCKJ8j6nNjs za+Fdn/Zmx7Nwq0npY2wSE6K/65mKpituGYshWgszbXujsa2C4LOGKYmBrXWAMqsHhZk dzAug91CI+xQams4Ntwr0hTe4dRBZOSfAhxxeRSz8D7gTCIm4bWh+wmhFWuITQJ5GWZI p8Ppdaut1HKYwQiz88BhbW052nrk95os7SRI+oqJvvM8DT8p9187Bsm3Ibwh0slRJL7C GuHqGcSZ+hhn6XS4bRu2tYDaytkFylv9nYI38h0KA40gF/Dhf137+j/nMwytxcCY0bIV yxuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=0o+EzHHK0qEKuJS4nAvuf1qFUtMYU5Pn7Tw+MdMbo24=; b=wvL3uS8oFxyfC6qnx2ki4owPPt5D59yANRC645I+oU6PRZwmRCIxhppnSLPN+OAmBm WePlGT9bN5JBcOcl6Zwznau41FuVfpAiXJoGNu21qQjpnl4/MEqYjW+qY7Bzb3gIuhG/ anRI3S5fVRwlx61LSPWxDNqX5RGOiBRBfBBWOcPxkQEJyH/zp4zU6K/9OwsnZAGjIYsY WBvGyz40hEaBXfsUyIz/98ub6ysfcsEOEhaRVXC/WtUWx1c71h/0O/LePuE34PNtfN5M sdKySq1qEJ9XSbKLGNuBJvdlbvnDfKsrlvu151KW494t5gK24uLzyQbXtQ91zn1YRqzZ a/cw== X-Gm-Message-State: ACrzQf0sGEbOZ2cX50k9trCugav+sJ/zrobXAZzECBRuoT6NIjz0mXhN p6l9liLjHxnNxkV10J03PdS7EBOpNvs= X-Google-Smtp-Source: AMsMyM4BtppDJKgcriXyYQiJchXeoNkFVVMupwaiPk8mRMPwi+bT/3boEB5+2TF1+6y9viZ/we/mwFmDxqY= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a81:3984:0:b0:370:7d9b:7a6d with SMTP id g126-20020a813984000000b003707d9b7a6dmr13100947ywa.274.1667431186021; Wed, 02 Nov 2022 16:19:46 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 2 Nov 2022 23:18:46 +0000 In-Reply-To: <20221102231911.3107438-1-seanjc@google.com> Mime-Version: 1.0 References: <20221102231911.3107438-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221102231911.3107438-20-seanjc@google.com> Subject: [PATCH 19/44] KVM: MIPS: Hardcode callbacks to hardware virtualization extensions From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Sean Christopherson , Vitaly Kuznetsov Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Isaku Yamahata , Fabiano Rosas , Michael Ellerman , Chao Gao , Thomas Gleixner , Yuan Yao Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Now that KVM no longer supports trap-and-emulate (see commit 45c7e8af4a5e "MIPS: Remove KVM_TE support"), hardcode the MIPS callbacks to the virtualization callbacks. Harcoding the callbacks eliminates the technically-unnecessary check on non-NULL kvm_mips_callbacks in kvm_arch_init(). MIPS has never supported multiple in-tree modules, i.e. barring an out-of-tree module, where copying and renaming kvm.ko counts as "out-of-tree", KVM could never encounter a non-NULL set of callbacks during module init. The callback check is also subtly broken, as it is not thread safe, i.e. if there were multiple modules, loading both concurrently would create a race between checking and setting kvm_mips_callbacks. Given that out-of-tree shenanigans are not the kernel's responsibility, hardcode the callbacks to simplify the code. Signed-off-by: Sean Christopherson --- arch/mips/include/asm/kvm_host.h | 2 +- arch/mips/kvm/Makefile | 2 +- arch/mips/kvm/callback.c | 14 -------------- arch/mips/kvm/mips.c | 9 ++------- arch/mips/kvm/vz.c | 7 ++++--- 5 files changed, 8 insertions(+), 26 deletions(-) delete mode 100644 arch/mips/kvm/callback.c diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 28f0ba97db71..2803c9c21ef9 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -758,7 +758,7 @@ struct kvm_mips_callbacks { void (*vcpu_reenter)(struct kvm_vcpu *vcpu); }; extern struct kvm_mips_callbacks *kvm_mips_callbacks; -int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks); +int kvm_mips_emulation_init(void); /* Debug: dump vcpu state */ int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu); diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile index 21ff75bcdbc4..805aeea2166e 100644 --- a/arch/mips/kvm/Makefile +++ b/arch/mips/kvm/Makefile @@ -17,4 +17,4 @@ kvm-$(CONFIG_CPU_LOONGSON64) += loongson_ipi.o kvm-y += vz.o obj-$(CONFIG_KVM) += kvm.o -obj-y += callback.o tlb.o +obj-y += tlb.o diff --git a/arch/mips/kvm/callback.c b/arch/mips/kvm/callback.c deleted file mode 100644 index d88aa2173fb0..000000000000 --- a/arch/mips/kvm/callback.c +++ /dev/null @@ -1,14 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. - * Authors: Yann Le Du - */ - -#include -#include - -struct kvm_mips_callbacks *kvm_mips_callbacks; -EXPORT_SYMBOL_GPL(kvm_mips_callbacks); diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index af29490d9740..f0a6c245d1ff 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -1012,17 +1012,12 @@ long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) int kvm_arch_init(void *opaque) { - if (kvm_mips_callbacks) { - kvm_err("kvm: module already exists\n"); - return -EEXIST; - } - - return kvm_mips_emulation_init(&kvm_mips_callbacks); + return kvm_mips_emulation_init(); } void kvm_arch_exit(void) { - kvm_mips_callbacks = NULL; + } int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index c706f5890a05..dafab003ea0d 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -3304,7 +3304,10 @@ static struct kvm_mips_callbacks kvm_vz_callbacks = { .vcpu_reenter = kvm_vz_vcpu_reenter, }; -int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) +/* FIXME: Get rid of the callbacks now that trap-and-emulate is gone. */ +struct kvm_mips_callbacks *kvm_mips_callbacks = &kvm_vz_callbacks; + +int kvm_mips_emulation_init(void) { if (!cpu_has_vz) return -ENODEV; @@ -3318,7 +3321,5 @@ int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) return -ENODEV; pr_info("Starting KVM with MIPS VZ extensions\n"); - - *install_callbacks = &kvm_vz_callbacks; return 0; } -- 2.38.1.431.g37b22c650d-goog