From nobody Mon Sep 15 23:28:28 2025 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 BCA57C54EBD for ; Mon, 9 Jan 2023 21:54:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237790AbjAIVyY (ORCPT ); Mon, 9 Jan 2023 16:54:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237601AbjAIVyI (ORCPT ); Mon, 9 Jan 2023 16:54:08 -0500 Received: from mail-ot1-x349.google.com (mail-ot1-x349.google.com [IPv6:2607:f8b0:4864:20::349]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C8BB14D13 for ; Mon, 9 Jan 2023 13:54:07 -0800 (PST) Received: by mail-ot1-x349.google.com with SMTP id cz20-20020a0568306a1400b006849b669d65so570193otb.10 for ; Mon, 09 Jan 2023 13:54:07 -0800 (PST) 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:from:to:cc:subject:date:message-id:reply-to; bh=SDYN0MRDIF+SnOeyd4pyYdGIKCrHRaNe9q+tU9g7tHk=; b=JpgU+lBoUCLbZ56Jvj7Pn/vdi78vU5U3QuKtvIBxucZgLmZuMLmd88ZuQTUzyBKvak 6URYiypCIW+TZt6tpj3vahCJkJfZ/bLR5/iBFmcgS2xJWZjSs5Km1XmDOCZFVyYNrNdF aQxMRNm9CoVdpDALfBC57x8+EFA1cfuvZqgDxyITXdGCIOEqTxQiAuVy9uJ1cxGO/3EV abfT9ocI5Otykw8Nadc9eXPbqcQZXXaZrNB0el9+yvluuWfZF1VWhrmpIVzBQ0tBz6CD +6oL0xnc06/xPuEhNIL+kfwdmFZFTaFbgKl3SlvFFlUqQ7wMRKAH+9CjY0D5URbPHfBd jhMg== 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:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=SDYN0MRDIF+SnOeyd4pyYdGIKCrHRaNe9q+tU9g7tHk=; b=nHXUnBLmbpCrMrKDdDHa+yfY5zztlxds2uXJF7VqDIZrXZ3TEu+wPxbkidlLxSDuSp jgKsoY62oLX/pKzL5sSCw/vmP2fqhO4o00OcsvJITPXFjG3WpQTdvQQWtBrIqnFs3de4 xg3qyQShIAQP0FUUk8SyNVWCcWZ9ASfLYIRQMPcLTERDPAQE7jVmoo5pc9p/N9RkHUUg W8O295G0atdSo0sB+vr6MB4GZwnpfbK+/MaR3h5sxlZ07h88m/wqFnLJQXyKtiyr/ioX 2VLVmxQnDBCr57w3/40Cw3TVHJP9L9HOCLweqYLUo3bjIDs8A/OkisBOkVAIepAencRa d3Cg== X-Gm-Message-State: AFqh2kpRn1JWcazTFAgdVuvowfRO6IuYedsJ3cQx4SvFt24foHmI6n8L zO65E3HQ4lh5xw7BM7IUkRO3B99sk8yx X-Google-Smtp-Source: AMrXdXtrkhTOwelbRPQw7yNs/JV3tuDLBxCLoimzlrlEKqCeF4IooRkE3J40GXTjhloRi+UlLLpIxIlpLZyo X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:22b5]) (user=rananta job=sendgmr) by 2002:a05:6808:1a1d:b0:364:532d:215a with SMTP id bk29-20020a0568081a1d00b00364532d215amr195559oib.187.1673301246427; Mon, 09 Jan 2023 13:54:06 -0800 (PST) Date: Mon, 9 Jan 2023 21:53:44 +0000 In-Reply-To: <20230109215347.3119271-1-rananta@google.com> Mime-Version: 1.0 References: <20230109215347.3119271-1-rananta@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230109215347.3119271-4-rananta@google.com> Subject: [RFC PATCH 3/6] KVM: Define kvm_flush_remote_tlbs_range From: Raghavendra Rao Ananta To: Oliver Upton , Marc Zyngier , Ricardo Koller , Reiji Watanabe , James Morse , Alexandru Elisei , Suzuki K Poulose Cc: Paolo Bonzini , Catalin Marinas , Will Deacon , Jing Zhang , Colton Lewis , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Define kvm_flush_remote_tlbs_range() to limit the TLB flush only to a certain range of addresses. Replace this with the existing call to kvm_flush_remote_tlbs() in the MMU notifier path. Architectures such as arm64 can define this to flush only the necessary addresses, instead of the entire range. Signed-off-by: Raghavendra Rao Ananta --- arch/arm64/kvm/mmu.c | 10 ++++++++++ include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 7 ++++++- 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 39d9a334efb57..70f76bc909c5d 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -91,6 +91,16 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu); } =20 +void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, uns= igned long end) +{ + struct kvm_s2_mmu *mmu =3D &kvm->arch.mmu; + + if (system_supports_tlb_range()) + kvm_call_hyp(__kvm_tlb_flush_range_vmid_ipa, mmu, start, end, 0); + else + kvm_flush_remote_tlbs(kvm); +} + static bool kvm_is_device_pfn(unsigned long pfn) { return !pfn_is_map_memory(pfn); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f51eb9419bfc3..a76cede9dc3bb 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 usermode_vcpu_not_eligib= le); =20 void kvm_flush_remote_tlbs(struct kvm *kvm); +void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, uns= igned long end); =20 #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 03e6a38094c17..f538ecc984f5b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -376,6 +376,11 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) ++kvm->stat.generic.remote_tlb_flush; } EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); + +void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, uns= igned long end) +{ + kvm_flush_remote_tlbs(kvm); +} #endif =20 static void kvm_flush_shadow_all(struct kvm *kvm) @@ -637,7 +642,7 @@ static __always_inline int __kvm_handle_hva_range(struc= t kvm *kvm, } =20 if (range->flush_on_ret && ret) - kvm_flush_remote_tlbs(kvm); + kvm_flush_remote_tlbs_range(kvm, range->start, range->end - 1); =20 if (locked) { KVM_MMU_UNLOCK(kvm); --=20 2.39.0.314.g84b9a713c41-goog