From nobody Sat May 4 06:47:05 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1586952007; cv=none; d=zohomail.com; s=zohoarc; b=S/5nZzuwahZ07UwPJpXg9oqpwUJdKWVmft+m6XSXYb2ejnVWWoSQQCYANSJxCF/AiDoH72sTT3eLLzA7iYzV0CV78/I9avXxAJF/SsFRaxdfj+en+12JdYzQ6W89f3poNzHKhWR4VtPeukHT72pyH8bkMpYWSRtMWzPEMREUg7M= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1586952007; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=9mcwfS2UNApo7+gpEmAq4QsskjJ6UAD8MG/Ev2F27Uc=; b=Jg8Jrtko1gLnpf3jNg00uJeBAKXwO7rvn1qA6ukkOWUoVy2P+aVUX/sbySHaTbr+HXVHl3JPgVDbQYu8oU6Aav24HsSRoBs/f/cXWn4pgBOS7cPXagXb0uYw8WqssKxN6Zh8gSAEGBKPdypLh7ga71OBGQu7OEGnrJNHrHxiXMs= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1586952007200963.6059855730624; Wed, 15 Apr 2020 05:00:07 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jOghi-0003Ef-Lx; Wed, 15 Apr 2020 11:59:42 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jOghh-0003EK-5Z for xen-devel@lists.xenproject.org; Wed, 15 Apr 2020 11:59:41 +0000 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 96400832-7f10-11ea-b58d-bc764e2007e4; Wed, 15 Apr 2020 11:59:40 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jOghg-00027R-9f; Wed, 15 Apr 2020 11:59:40 +0000 Received: from 54-240-197-226.amazon.com ([54.240.197.226] helo=u1bbd043a57dd5a.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1jOghf-0008L0-Vd; Wed, 15 Apr 2020 11:59:40 +0000 X-Inumbo-ID: 96400832-7f10-11ea-b58d-bc764e2007e4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=9mcwfS2UNApo7+gpEmAq4QsskjJ6UAD8MG/Ev2F27Uc=; b=RV3IORgR7mWX/59sDGHfPn9mNz p0JKr88IhtNwd8y4fBK2mP2U45nI4djiIpC63+Rv4jz4VtzY4uP/6GkpPj4MnMDLZyxRUjxDaxLya autw7/H49qggpvOok3nkV0gUVTFOsgn2no1BIuKc9mzV8s8ZhhRhJ1UquB7PbXF4c7KY=; From: Hongyan Xia To: xen-devel@lists.xenproject.org Subject: [PATCH v3 1/4] x86/shim: map and unmap page tables in replace_va_mapping Date: Wed, 15 Apr 2020 12:59:24 +0100 Message-Id: <37ad7487bc6e6f76e2082c0b42b4cf819007f513.1586951696.git.hongyxia@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , julien@xen.org, Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Liu Also, introduce lYe_from_lXe() macros which do not rely on the direct map when walking page tables. Unfortunately, they cannot be inline functions due to the header dependency on domain_page.h, so keep them as macros just like map_lYt_from_lXe(). Signed-off-by: Wei Liu Signed-off-by: Hongyan Xia --- Changed in v3: - use unmap_domain_page() instead of the macro in several places. - also introduce l1e_from_l2e(). - add _ prefix in macros to avoid aliasing. Changed in v2: - instead of map, map, map, read/write, unmap, unmap, unmap, do map, read PTE, unmap for each level instead. - use lYe_from_lXe() macros and lift them from a later patch to this patch. - const qualify pointers in new macros. --- xen/arch/x86/pv/shim.c | 9 +++++---- xen/include/asm-x86/page.h | 19 +++++++++++++++++++ 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index ed2ece8a8a..31264582cc 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -168,16 +168,17 @@ const struct platform_bad_page *__init pv_shim_reserv= ed_pages(unsigned int *size static void __init replace_va_mapping(struct domain *d, l4_pgentry_t *l4st= art, unsigned long va, mfn_t mfn) { - l4_pgentry_t *pl4e =3D l4start + l4_table_offset(va); - l3_pgentry_t *pl3e =3D l4e_to_l3e(*pl4e) + l3_table_offset(va); - l2_pgentry_t *pl2e =3D l3e_to_l2e(*pl3e) + l2_table_offset(va); - l1_pgentry_t *pl1e =3D l2e_to_l1e(*pl2e) + l1_table_offset(va); + l4_pgentry_t l4e =3D l4start[l4_table_offset(va)]; + l3_pgentry_t l3e =3D l3e_from_l4e(l4e, l3_table_offset(va)); + l2_pgentry_t l2e =3D l2e_from_l3e(l3e, l2_table_offset(va)); + l1_pgentry_t *pl1e =3D map_l1t_from_l2e(l2e) + l1_table_offset(va); struct page_info *page =3D mfn_to_page(l1e_get_mfn(*pl1e)); =20 put_page_and_type(page); =20 *pl1e =3D l1e_from_mfn(mfn, (!is_pv_32bit_domain(d) ? L1_PROT : COMPAT_L1_PROT)); + unmap_domain_page(pl1e); } =20 static void evtchn_reserve(struct domain *d, unsigned int port) diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h index eb73a0fc23..d50989a357 100644 --- a/xen/include/asm-x86/page.h +++ b/xen/include/asm-x86/page.h @@ -197,6 +197,25 @@ static inline l4_pgentry_t l4e_from_paddr(paddr_t pa, = unsigned int flags) #define map_l2t_from_l3e(x) (l2_pgentry_t *)map_domain_page(l3e_get= _mfn(x)) #define map_l3t_from_l4e(x) (l3_pgentry_t *)map_domain_page(l4e_get= _mfn(x)) =20 +/* Unlike lYe_to_lXe(), lXe_from_lYe() do not rely on the direct map. */ +#define l1e_from_l2e(_l2e, _offset) ({ \ + const l1_pgentry_t *_l1t =3D map_l1t_from_l2e(_l2e); \ + l1_pgentry_t _l1e =3D _l1t[_offset]; \ + unmap_domain_page(_l1t); \ + _l1e; }) + +#define l2e_from_l3e(_l3e, _offset) ({ \ + const l2_pgentry_t *_l2t =3D map_l2t_from_l3e(_l3e); \ + l2_pgentry_t _l2e =3D _l2t[_offset]; \ + unmap_domain_page(_l2t); \ + _l2e; }) + +#define l3e_from_l4e(_l4e, _offset) ({ \ + const l3_pgentry_t *_l3t =3D map_l3t_from_l4e(_l4e); \ + l3_pgentry_t _l3e =3D _l3t[_offset]; \ + unmap_domain_page(_l3t); \ + _l3e; }) + /* Given a virtual address, get an entry offset into a page table. */ #define l1_table_offset(a) \ (((a) >> L1_PAGETABLE_SHIFT) & (L1_PAGETABLE_ENTRIES - 1)) --=20 2.24.1.AMZN From nobody Sat May 4 06:47:05 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1586952011; cv=none; d=zohomail.com; s=zohoarc; b=BepeBhtq/KzZYDVUqmn6Q5ud+crodxaLo+fKY/vFdxTcMtkDsU4RMu3Hzy4viQ0Sxm+uDu4tp/X+RLjzSvzK5UrP39EpGPlkD3muKetmbx5LF73L2hO8cOs2RxfvZq9rTIpADHkbHZdpXYB5EBEawbW/zq6Z4hfV6YAs0gSKiBg= ARC-Message-Signature: i=1; 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Wed, 15 Apr 2020 11:59:46 +0000 Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 973ca8c6-7f10-11ea-83d8-bc764e2007e4; Wed, 15 Apr 2020 11:59:42 +0000 (UTC) Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jOghh-00027X-Oa; Wed, 15 Apr 2020 11:59:41 +0000 Received: from 54-240-197-226.amazon.com ([54.240.197.226] helo=u1bbd043a57dd5a.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1jOghh-0008L0-Eb; Wed, 15 Apr 2020 11:59:41 +0000 X-Inumbo-ID: 973ca8c6-7f10-11ea-83d8-bc764e2007e4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=CtlOkdsHjlKFcb39XzK+uw2HvlaIF3cGj21C2XsAUj8=; b=FpVo8693YOPFA2t/1W+vffr5Ws 3tlJRH5F3gQAuMtWynTMp+WVSXr11rzOZbjUkHl5iMEBCTrPQAtJF53/Q3NaLj2s4ZwysEC24w4rA yAnvGCube/J6z8s1HAaSrMBRTieI2+S5xAS6acQQ8UnYjCrzRHRxBE43dGM4NyxRxscg=; From: Hongyan Xia To: xen-devel@lists.xenproject.org Subject: [PATCH v3 2/4] x86_64/mm: map and unmap page tables in m2p_mapped Date: Wed, 15 Apr 2020 12:59:25 +0100 Message-Id: <4e76f1b1ad2f63c460571924632fa910c33a16fd.1586951696.git.hongyxia@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , julien@xen.org, Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Liu Signed-off-by: Wei Liu Signed-off-by: Hongyan Xia Reviewed-by: Jan Beulich --- Changed in v3: - rename l3e_ro_mpt and l2e_ro_mpt, just call them l3e and l2e. Changed in v2: - avoid adding goto labels, simply get the PTE and unmap quickly. - code style fixes. --- xen/arch/x86/x86_64/mm.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c index cee836ec37..41755ded26 100644 --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -129,14 +129,13 @@ static mfn_t alloc_hotadd_mfn(struct mem_hotadd_info = *info) static int m2p_mapped(unsigned long spfn) { unsigned long va; - l3_pgentry_t *l3_ro_mpt; - l2_pgentry_t *l2_ro_mpt; + l3_pgentry_t l3e; + l2_pgentry_t l2e; =20 va =3D RO_MPT_VIRT_START + spfn * sizeof(*machine_to_phys_mapping); - l3_ro_mpt =3D l4e_to_l3e(idle_pg_table[l4_table_offset(va)]); + l3e =3D l3e_from_l4e(idle_pg_table[l4_table_offset(va)], l3_table_offs= et(va)); =20 - switch ( l3e_get_flags(l3_ro_mpt[l3_table_offset(va)]) & - (_PAGE_PRESENT |_PAGE_PSE)) + switch ( l3e_get_flags(l3e) & (_PAGE_PRESENT | _PAGE_PSE) ) { case _PAGE_PSE|_PAGE_PRESENT: return M2P_1G_MAPPED; @@ -146,9 +145,9 @@ static int m2p_mapped(unsigned long spfn) default: return M2P_NO_MAPPED; } - l2_ro_mpt =3D l3e_to_l2e(l3_ro_mpt[l3_table_offset(va)]); + l2e =3D l2e_from_l3e(l3e, l2_table_offset(va)); =20 - if (l2e_get_flags(l2_ro_mpt[l2_table_offset(va)]) & _PAGE_PRESENT) + if ( l2e_get_flags(l2e) & _PAGE_PRESENT ) return M2P_2M_MAPPED; =20 return M2P_NO_MAPPED; --=20 2.24.1.AMZN From nobody Sat May 4 06:47:05 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1586952003; cv=none; d=zohomail.com; s=zohoarc; b=CpnhnIx48eQoJ7RwyH5DtF9gZZd8nknTbD0U8R1i3yxEyxA2got70NjwBGksl9gP8HpFWF7Kby05+9zZiz99H+mum+mWxQ1rAt0jSB/XwlObwpwVwpuwsnUWmrzfYmobjVJwKxiVEkQ7DCzyB9djrf7/JZGbMjI/4im2s0JBOi4= ARC-Message-Signature: i=1; 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bh=NjsU0mvN8f3Kkt58hhovqMgTFjoAL4EcJkT/EkRsASw=; b=YRocKqYUdMym1/68P8V3o6gmma mAV7pQqwqJ9R1TFAkiQ6tJ6gWhh+ncMYSwHckl/uC3xssDklx5AXNGn/5L8LE9Il09LtghxsftmIc Y5MrQ3pt2oguIL/oYpLJ8pO8Fv01Ad5nggAPS+NvKOYTY7AypvphkNKZqwSy6+ZHB8Po=; From: Hongyan Xia To: xen-devel@lists.xenproject.org Subject: [PATCH v3 3/4] x86_64/mm: map and unmap page tables in share_hotadd_m2p_table Date: Wed, 15 Apr 2020 12:59:26 +0100 Message-Id: <584d70dfd76de21231b1f39f25a36fe58375e4f0.1586951696.git.hongyxia@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , julien@xen.org, Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Liu Fetch lYe by mapping and unmapping lXe instead of using the direct map, which is now done via the lYe_from_lXe() helpers. Signed-off-by: Wei Liu Signed-off-by: Hongyan Xia Reviewed-by: Jan Beulich --- Changed in v2: - the introduction of the macros is now lifted to a previous patch. --- xen/arch/x86/x86_64/mm.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c index 41755ded26..cfaeae84e9 100644 --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -166,14 +166,14 @@ static int share_hotadd_m2p_table(struct mem_hotadd_i= nfo *info) v +=3D n << PAGE_SHIFT ) { n =3D L2_PAGETABLE_ENTRIES * L1_PAGETABLE_ENTRIES; - l3e =3D l4e_to_l3e(idle_pg_table[l4_table_offset(v)])[ - l3_table_offset(v)]; + l3e =3D l3e_from_l4e(idle_pg_table[l4_table_offset(v)], + l3_table_offset(v)); if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) ) continue; if ( !(l3e_get_flags(l3e) & _PAGE_PSE) ) { n =3D L1_PAGETABLE_ENTRIES; - l2e =3D l3e_to_l2e(l3e)[l2_table_offset(v)]; + l2e =3D l2e_from_l3e(l3e, l2_table_offset(v)); if ( !(l2e_get_flags(l2e) & _PAGE_PRESENT) ) continue; m2p_start_mfn =3D l2e_get_mfn(l2e); @@ -194,11 +194,11 @@ static int share_hotadd_m2p_table(struct mem_hotadd_i= nfo *info) v !=3D RDWR_COMPAT_MPT_VIRT_END; v +=3D 1 << L2_PAGETABLE_SHIFT ) { - l3e =3D l4e_to_l3e(idle_pg_table[l4_table_offset(v)])[ - l3_table_offset(v)]; + l3e =3D l3e_from_l4e(idle_pg_table[l4_table_offset(v)], + l3_table_offset(v)); if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) ) continue; - l2e =3D l3e_to_l2e(l3e)[l2_table_offset(v)]; + l2e =3D l2e_from_l3e(l3e, l2_table_offset(v)); if ( !(l2e_get_flags(l2e) & _PAGE_PRESENT) ) continue; m2p_start_mfn =3D l2e_get_mfn(l2e); --=20 2.24.1.AMZN From nobody Sat May 4 06:47:05 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; 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Wed, 15 Apr 2020 11:59:44 +0000 X-Inumbo-ID: 99053150-7f10-11ea-9e09-bc764e2007e4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=Onk2HyVxQC7Z1tK6M5fg+SsU7UsZSdPa4/KYlIbZ/2E=; b=0BLd2aIvG8etsRxbRHXjrkXjYV m37WBxwdF8k193NgpVxpzByiBdRFWR7gLrFHhfvSkCiiWfQngczijQAKUzHuh6AEYFr2r8DNiS5vB EfXiSa4qGaQpHuVJXEA3fSfP5BYUY83fnpWVrA9oVn0EqErWL5sq9ZzFq9tZL1YfWJU8=; From: Hongyan Xia To: xen-devel@lists.xenproject.org Subject: [PATCH v3 4/4] x86_64/mm: map and unmap page tables in destroy_m2p_mapping Date: Wed, 15 Apr 2020 12:59:27 +0100 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , julien@xen.org, Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Liu Signed-off-by: Wei Liu Signed-off-by: Hongyan Xia --- Changed in v3: - rename l2_ro_mpt into pl2e to avoid confusion. Changed in v2: - no point in re-mapping l2t because it is exactly the same as l2_ro_mpt. - point l2_ro_mpt to the entry instead of doing l2_table_offset() all the time. --- xen/arch/x86/x86_64/mm.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c index cfaeae84e9..30ed4e98dd 100644 --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -263,7 +263,8 @@ static void destroy_m2p_mapping(struct mem_hotadd_info = *info) unsigned long i, va, rwva; unsigned long smap =3D info->spfn, emap =3D info->epfn; =20 - l3_ro_mpt =3D l4e_to_l3e(idle_pg_table[l4_table_offset(RO_MPT_VIRT_STA= RT)]); + l3_ro_mpt =3D map_l3t_from_l4e( + idle_pg_table[l4_table_offset(RO_MPT_VIRT_START)]); =20 /* * No need to clean m2p structure existing before the hotplug @@ -271,7 +272,7 @@ static void destroy_m2p_mapping(struct mem_hotadd_info = *info) for (i =3D smap; i < emap;) { unsigned long pt_pfn; - l2_pgentry_t *l2_ro_mpt; + l2_pgentry_t *pl2e; =20 va =3D RO_MPT_VIRT_START + i * sizeof(*machine_to_phys_mapping); rwva =3D RDWR_MPT_VIRT_START + i * sizeof(*machine_to_phys_mapping= ); @@ -285,26 +286,30 @@ static void destroy_m2p_mapping(struct mem_hotadd_inf= o *info) continue; } =20 - l2_ro_mpt =3D l3e_to_l2e(l3_ro_mpt[l3_table_offset(va)]); - if (!(l2e_get_flags(l2_ro_mpt[l2_table_offset(va)]) & _PAGE_PRESEN= T)) + pl2e =3D map_l2t_from_l3e(l3_ro_mpt[l3_table_offset(va)]) + + l2_table_offset(va); + if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) ) { i =3D ( i & ~((1UL << (L2_PAGETABLE_SHIFT - 3)) - 1)) + (1UL << (L2_PAGETABLE_SHIFT - 3)) ; + UNMAP_DOMAIN_PAGE(pl2e); continue; } =20 - pt_pfn =3D l2e_get_pfn(l2_ro_mpt[l2_table_offset(va)]); + pt_pfn =3D l2e_get_pfn(*pl2e); if ( hotadd_mem_valid(pt_pfn, info) ) { destroy_xen_mappings(rwva, rwva + (1UL << L2_PAGETABLE_SHIFT)); =20 - l2_ro_mpt =3D l3e_to_l2e(l3_ro_mpt[l3_table_offset(va)]); - l2e_write(&l2_ro_mpt[l2_table_offset(va)], l2e_empty()); + l2e_write(pl2e, l2e_empty()); } i =3D ( i & ~((1UL << (L2_PAGETABLE_SHIFT - 3)) - 1)) + (1UL << (L2_PAGETABLE_SHIFT - 3)); + UNMAP_DOMAIN_PAGE(pl2e); } =20 + UNMAP_DOMAIN_PAGE(l3_ro_mpt); + destroy_compat_m2p_mapping(info); =20 /* Brute-Force flush all TLB */ --=20 2.24.1.AMZN