From nobody Wed Sep 17 05:51:33 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 730A4C05051 for ; Sat, 29 Jul 2023 01:36:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233684AbjG2BgA (ORCPT ); Fri, 28 Jul 2023 21:36:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237373AbjG2Bfw (ORCPT ); Fri, 28 Jul 2023 21:35:52 -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 731BC3C12 for ; Fri, 28 Jul 2023 18:35:50 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-584139b6b03so27878337b3.3 for ; Fri, 28 Jul 2023 18:35:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1690594549; x=1691199349; 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=jEX944Eq3FR7IMm0zyV2J78IA1pYMR7a1LBZmsndkp4=; b=EusHJXExcAmxW94p+Y+WzpBoXgOHGapVubepNLVe1AjQFq4L5DyiXFwSfT7lAKZP2B LbstAlazYFqIHYNHWE9V6nKli4q5Y0K2fyfD216QZG3evAmQp6EgzhArMOhsjP2D0ElV B6qwPZ9a/i9In0E55fHIM4mb9ugp3zYDctkxuHsv6F88IcOYAE2VED+v+Lk/ZmoPYG/2 lkQCY3PhAbTRH+u8Ae/SnMEwzw13MNUKDcBi0qG4LXNUvbTFAvrgKXodpE6AzSf38TDQ sMQJ+cT1fMFi0cUz1wu0ff5mLmSDncQAQiHhjP1MSwt+Xyt6OmHxozc9Cly/LUlxpBCN YceQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690594549; x=1691199349; 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=jEX944Eq3FR7IMm0zyV2J78IA1pYMR7a1LBZmsndkp4=; b=fO3DfKCJ4T9TWX2k4HHwSnlVqw7d1GEsDZeZ0B+CUVY7hRkAPI+Ms4aej18Y38etwF K7bLzWT/mAXuLY2A+laiqbpCE16VEXOG2Gqp/RBLQyPCArrJldNE06AGtI5koRl9gGYa AntKFd/0dAv4+I2HDgWIQ+o4ZXGE/957ZTbIpGclMT1WCi/l5o4AX8wxqIXSUZ0JX8y4 Pr6AFKtgIhu7bd5m7CpLCvHoWfqoTCrHC1tb+/7OytV+RHf1eIGxw42LC+9QFNiyRuo1 jWf8Uy3k9I2kMxaaZ44O0OsD7/l8QaGCh+gbXaV9kiHsHSj8Wb5tCmeiBWOrXfOneyCV iF0g== X-Gm-Message-State: ABy/qLZhmRZjFoEBq1CPvBa/Vyl7O1xAqB/5p6ZWJHccCvUwB48jo7Vb rScI+4I4mjdeF4NVeQR8d/5Z/l3Svao= X-Google-Smtp-Source: APBJJlHaMJ266s4owvydBsGasNevM0zaMSoOGKTU1pN9RjVzgaKXC6MzhQvAdGBBorhN1PRis7f6VXl7qB0= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a81:af03:0:b0:583:9db4:6c20 with SMTP id n3-20020a81af03000000b005839db46c20mr22745ywh.1.1690594549610; Fri, 28 Jul 2023 18:35:49 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 28 Jul 2023 18:35:09 -0700 In-Reply-To: <20230729013535.1070024-1-seanjc@google.com> Mime-Version: 1.0 References: <20230729013535.1070024-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.487.g6d72f3e995-goog Message-ID: <20230729013535.1070024-4-seanjc@google.com> Subject: [PATCH v4 03/29] drm/i915/gvt: Verify hugepages are contiguous in physical address space From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Zhenyu Wang , Zhi Wang Cc: kvm@vger.kernel.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Yan Zhao , Yongwei Ma , Ben Gardon Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When shadowing a GTT entry with a 2M page, verify that the pfns are contiguous, not just that the struct page pointers are contiguous. The memory map is virtual contiguous if "CONFIG_FLATMEM=3Dy || CONFIG_SPARSEMEM_VMEMMAP=3Dy", but not for "CONFIG_SPARSEMEM=3Dy && CONFIG_SPARSEMEM_VMEMMAP=3Dn", so theoretically KVMGT could encounter struct pages that are virtually contiguous, but not physically contiguous. In practice, this flaw is likely a non-issue as it would cause functional problems iff a section isn't 2M aligned _and_ is directly adjacent to another section with discontiguous pfns. Tested-by: Yongwei Ma Signed-off-by: Sean Christopherson Reviewed-by: Yan Zhao Reviewed-by: Zhi Wang --- drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kv= mgt.c index de675d799c7d..429f0f993a13 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -161,7 +161,7 @@ static int gvt_pin_guest_page(struct intel_vgpu *vgpu, = unsigned long gfn, =20 if (npage =3D=3D 0) base_page =3D cur_page; - else if (base_page + npage !=3D cur_page) { + else if (page_to_pfn(base_page) + npage !=3D page_to_pfn(cur_page)) { gvt_vgpu_err("The pages are not continuous\n"); ret =3D -EINVAL; npage++; --=20 2.41.0.487.g6d72f3e995-goog