From patchwork Fri Jul 26 23:51:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 1965499 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=X1ZzTl4g; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WW4mH1xbwz1ybY for ; Sat, 27 Jul 2024 10:11:27 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=X1ZzTl4g; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WW4mH0wjVz301T for ; Sat, 27 Jul 2024 10:11:27 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=X1ZzTl4g; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=flex--seanjc.bounces.google.com (client-ip=2607:f8b0:4864:20::64a; helo=mail-pl1-x64a.google.com; envelope-from=3_takzgykddgmyuhdwaiiafy.wigfchorjjw-xypfcmnm.itfuvm.ila@flex--seanjc.bounces.google.com; receiver=lists.ozlabs.org) Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4WW4Mg1bhYz3dKH for ; Sat, 27 Jul 2024 09:53:35 +1000 (AEST) Received: by mail-pl1-x64a.google.com with SMTP id d9443c01a7336-1fc4e03a885so10835285ad.2 for ; Fri, 26 Jul 2024 16:53:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722038014; x=1722642814; darn=lists.ozlabs.org; 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=o1vHCUb6CZ680r+o/spGyfXDOmfamym0Nonz9UARGME=; b=X1ZzTl4gs1TUCZsl5fcWhPUR8gH5U+WFW8AE+uSUYzPv9BINDaX4YKmq0B8I2jC6w5 stjoebjAJF5pOuQisjDqipTyMJZJyUf3GifiC7srBJqyDrRXu1BpbMucoctd4a0ZS2Oe d5hc4gVmBXBeYQgQZmjZ7pNd1J83cTOj+rT5e2CaRnKAMR03BFlO4RUYszs4b7rq5oCA NMkufd/PgeejEZ9xEmtly7vbwyDydFTej8lj+skagGEcKBGxvxe8yYJ9fUTDjUK8CEXs sILWRmDC28kpJUJo4UU4LLhyWuyunlUVyV+GqL4ERW1Mq87VOJ3oycX/KnPEzTZJzDTl +Xbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722038014; x=1722642814; 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=o1vHCUb6CZ680r+o/spGyfXDOmfamym0Nonz9UARGME=; b=IEt1YwJaffPlx0Rd3azuBGK8TG+d9LRNiyaVq/VGKBDupwWG/w3B1lDEIrnlsZ/Uix HMZ0KEL2AJESAhUh6Nsdm7hJYwX0xwiH89l1XSeyce6+4SPhJQ63kHJnb1xIL0ORPShJ xq/ykAal1h5kbBH9m0c5SC56Tq6/qe++u4mK1/L8y0iDrobfiZ53LA6WAueiDv77yRBZ XsVavIsz1rw4yMtQPOghAr4uoi2Uzoex0zQUyWnxCkyLlkKOX07FckF345vrxawllHoQ XVQjYJSQwB6FcMb4DR2p5LzH5cAWFaXoxsOtDEU2473lSjg5YIynCn/IirssuRO1pcuP amYQ== X-Forwarded-Encrypted: i=1; AJvYcCXW0w+jPPsR3CIeQ/+A7kHUd04z8gREllbIjFkjwc69TawOomSy0UyBuqxoXw10Rv2abRwbb98naSUEh7+FVOH2lulRLgQLA+/eXuMtPQ== X-Gm-Message-State: AOJu0Yyo+7Ebf8owb1UIFw0KfMwI3O8FEpip7SiGCBKiuaSZKvHcBnAI XaStLvI9ar1rSqZNYT6+tebr6qpXEW66FaD9+gWPfmwAjFMkrIayHhstncpJhxWN3ZEr/rhYjCR gSA== X-Google-Smtp-Source: AGHT+IEBaNygerYKF4xG2tivsYC4I+4KiNqX7pDiMNbM1xexlfLGsv92ykpFMstIuclC7BO9j6NqEQXsK1A= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:d2c5:b0:1f9:b35f:a2b6 with SMTP id d9443c01a7336-1ff047dce33mr22915ad.1.1722038013079; Fri, 26 Jul 2024 16:53:33 -0700 (PDT) Date: Fri, 26 Jul 2024 16:51:36 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Mime-Version: 1.0 References: <20240726235234.228822-1-seanjc@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240726235234.228822-28-seanjc@google.com> Subject: [PATCH v12 27/84] KVM: pfncache: Precisely track refcounted pages From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Cc: kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, David Matlack , David Stevens , loongarch@lists.linux.dev, kvmarm@lists.linux.dev, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Track refcounted struct page memory using kvm_follow_pfn.refcounted_page instead of relying on kvm_release_pfn_clean() to correctly detect that the pfn is associated with a struct page. Signed-off-by: Sean Christopherson --- virt/kvm/pfncache.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index 067daf9ad6ef..728d2c1b488a 100644 --- a/virt/kvm/pfncache.c +++ b/virt/kvm/pfncache.c @@ -159,11 +159,14 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) kvm_pfn_t new_pfn = KVM_PFN_ERR_FAULT; void *new_khva = NULL; unsigned long mmu_seq; + struct page *page; + struct kvm_follow_pfn kfp = { .slot = gpc->memslot, .gfn = gpa_to_gfn(gpc->gpa), .flags = FOLL_WRITE, .hva = gpc->uhva, + .refcounted_page = &page, }; lockdep_assert_held(&gpc->refresh_lock); @@ -198,7 +201,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) if (new_khva != old_khva) gpc_unmap(new_pfn, new_khva); - kvm_release_pfn_clean(new_pfn); + kvm_release_page_unused(page); cond_resched(); } @@ -218,7 +221,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) new_khva = gpc_map(new_pfn); if (!new_khva) { - kvm_release_pfn_clean(new_pfn); + kvm_release_page_unused(page); goto out_error; } @@ -236,11 +239,11 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) gpc->khva = new_khva + offset_in_page(gpc->uhva); /* - * Put the reference to the _new_ pfn. The pfn is now tracked by the + * Put the reference to the _new_ page. The page is now tracked by the * cache and can be safely migrated, swapped, etc... as the cache will * invalidate any mappings in response to relevant mmu_notifier events. */ - kvm_release_pfn_clean(new_pfn); + kvm_release_page_clean(page); return 0;