From patchwork Fri Aug 11 04:51:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raghavendra Rao Ananta X-Patchwork-Id: 13350088 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 6D40CC41513 for ; Fri, 11 Aug 2023 04:51:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233612AbjHKEv5 (ORCPT ); Fri, 11 Aug 2023 00:51:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233483AbjHKEvo (ORCPT ); Fri, 11 Aug 2023 00:51:44 -0400 Received: from mail-oo1-xc49.google.com (mail-oo1-xc49.google.com [IPv6:2607:f8b0:4864:20::c49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D80C2D72 for ; Thu, 10 Aug 2023 21:51:41 -0700 (PDT) Received: by mail-oo1-xc49.google.com with SMTP id 006d021491bc7-56d2c34fa25so1790442eaf.1 for ; Thu, 10 Aug 2023 21:51:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1691729500; x=1692334300; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=K3pnh3N/YIF0SxqOcKLFCFAu/7kR/Uv7ltNd2DAApng=; b=Q/eD8y0h2l6JvWr9yxmhkzDz3/gU+uCMrAapE+RfKfpEujedU2m/cioIEtNiwyWcDq 6oU/mRQTOMuz+meNoZkHUXpRaB1Kf60Q4R97OmOR3SyHx7RuYNOseDNnfQaON1qyo5sp Yy7qpgB8KdX4r7NgDYWnxRanbAd0O25zsnOgYls8iU4oaEYwKOd4OuGHRAElOOULjwZ7 zv+qj9vFVZl3xEcKvgpLumSuTYsp2PPSqwEIKmfHkh1NMsSMLhmU4qETWPBj1KkWIsjx AfAcpwHEssHw6PsET2R5l/KBjsPVbkindLK/jYg8Jg4IOgwBWrE2JstApGnRH9vE/HVL nJiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691729500; x=1692334300; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=K3pnh3N/YIF0SxqOcKLFCFAu/7kR/Uv7ltNd2DAApng=; b=drkrBd51WB4moL5PtoaITOondtRglZqWvx2n616+2iXUh8/opGIlMjbQeoa75MVK6n T3qb1ynOgmnaCtdY/M1FFIR8vKcf7RZeQH5aZm33Q63AyzvipdAzBHIS8BvMMo6qO9mQ +hlbofN9FOKUS0FyhPEbZKOgGDwmScYPr3Anthq8N/LRf8eNSYwUvho3O4uLSfBUV829 dJglbppNM9Xl2Ih38p2TiiKCctHBmEHaHXvCUOCAsw22jrpqsnOXKmJw+Jz5uS0V6cjk c9l5nMh3VJNXKSE1YqzlZBgsNDqgZfPEOGzoD4Prw0lb/Khu93jhYgGPiTuCzhppix7i V88A== X-Gm-Message-State: AOJu0YxPNNaf4VoWHnyTbVECfYpvbzpK+TRCaQanyq2EffxojIZPYuUq X1r/qWFN73M/6njW431E68kW9uztEBFR X-Google-Smtp-Source: AGHT+IFGVe7NxFpz5VE0E4/WvtFaQI/uiF+IxB2dFVJtq+EJbiYPxTNleKK3q6v99h+PTIzxrx3AKKcqdkl2 X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:22b5]) (user=rananta job=sendgmr) by 2002:a05:6870:7685:b0:1c2:d3de:c298 with SMTP id dx5-20020a056870768500b001c2d3dec298mr3535oab.11.1691729500567; Thu, 10 Aug 2023 21:51:40 -0700 (PDT) Date: Fri, 11 Aug 2023 04:51:18 +0000 In-Reply-To: <20230811045127.3308641-1-rananta@google.com> Mime-Version: 1.0 References: <20230811045127.3308641-1-rananta@google.com> X-Mailer: git-send-email 2.41.0.640.ga95def55d0-goog Message-ID: <20230811045127.3308641-6-rananta@google.com> Subject: [PATCH v9 05/14] KVM: Allow range-based TLB invalidation from common code From: Raghavendra Rao Ananta To: Oliver Upton , Marc Zyngier , James Morse , Suzuki K Poulose Cc: Paolo Bonzini , Sean Christopherson , Huacai Chen , Zenghui Yu , Anup Patel , Atish Patra , Jing Zhang , Reiji Watanabe , Colton Lewis , Raghavendra Rao Anata , David Matlack , Fuad Tabba , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Gavin Shan , Shaoqin Huang Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Matlack Make kvm_flush_remote_tlbs_range() visible in common code and create a default implementation that just invalidates the whole TLB. This paves the way for several future features/cleanups: - Introduction of range-based TLBI on ARM. - Eliminating kvm_arch_flush_remote_tlbs_memslot() - Moving the KVM/x86 TDP MMU to common code. No functional change intended. Signed-off-by: David Matlack Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Gavin Shan Reviewed-by: Shaoqin Huang Reviewed-by: Anup Patel Acked-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/mmu/mmu.c | 10 ++++------ arch/x86/kvm/mmu/mmu_internal.h | 3 --- include/linux/kvm_host.h | 11 +++++++++++ virt/kvm/kvm_main.c | 13 +++++++++++++ 5 files changed, 30 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a2d3cfc2eb75c..b547d17c58f63 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1804,6 +1804,8 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) return -ENOTSUPP; } +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE + #define kvm_arch_pmi_in_guest(vcpu) \ ((vcpu) && (vcpu)->arch.handling_intr_from_guest) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index ec169f5c7dce2..00f7bda9202f2 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -278,16 +278,14 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) return kvm_x86_ops.flush_remote_tlbs_range; } -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, - gfn_t nr_pages) +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages) { int ret = -EOPNOTSUPP; if (kvm_x86_ops.flush_remote_tlbs_range) - ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, start_gfn, - nr_pages); - if (ret) - kvm_flush_remote_tlbs(kvm); + ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages); + + return ret; } static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index); diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index d39af5639ce97..86cb83bb34804 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -170,9 +170,6 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm, struct kvm_memory_slot *slot, u64 gfn, int min_level); -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, - gfn_t nr_pages); - /* Flush the given page (huge or not) of guest memory. */ static inline void kvm_flush_remote_tlbs_gfn(struct kvm *kvm, gfn_t gfn, int level) { diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ade5d4500c2ce..89d2614e4b7a6 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1359,6 +1359,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode); void kvm_flush_remote_tlbs(struct kvm *kvm); +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages); #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min); @@ -1488,6 +1489,16 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) int kvm_arch_flush_remote_tlbs(struct kvm *kvm); #endif +#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE +static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, + gfn_t gfn, u64 nr_pages) +{ + return -EOPNOTSUPP; +} +#else +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages); +#endif + #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA void kvm_arch_register_noncoherent_dma(struct kvm *kvm); void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d6b0507861550..26e91000f579d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -366,6 +366,19 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) } EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages) +{ + if (!kvm_arch_flush_remote_tlbs_range(kvm, gfn, nr_pages)) + return; + + /* + * Fall back to a flushing entire TLBs if the architecture range-based + * TLB invalidation is unsupported or can't be performed for whatever + * reason. + */ + kvm_flush_remote_tlbs(kvm); +} + static void kvm_flush_shadow_all(struct kvm *kvm) { kvm_arch_flush_shadow_all(kvm);