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From: Hongyan Xia To: xen-devel@lists.xenproject.org Subject: [PATCH 5/6] x86/pv: map and unmap page tables in mark_pv_pt_pages_rdonly Date: Fri, 17 Apr 2020 10:52:07 +0100 Message-Id: <9287363e13924f4a633b47b53c23b3466e26e4a8.1587116799.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: Julien Grall --- xen/arch/x86/pv/dom0_build.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c index 5678da782d..28a939b68a 100644 --- a/xen/arch/x86/pv/dom0_build.c +++ b/xen/arch/x86/pv/dom0_build.c @@ -50,17 +50,17 @@ static __init void mark_pv_pt_pages_rdonly(struct domai= n *d, unsigned long count; struct page_info *page; l4_pgentry_t *pl4e; - l3_pgentry_t *pl3e; - l2_pgentry_t *pl2e; - l1_pgentry_t *pl1e; + l3_pgentry_t *pl3e, *l3t; + l2_pgentry_t *pl2e, *l2t; + l1_pgentry_t *pl1e, *l1t; =20 pl4e =3D l4start + l4_table_offset(vpt_start); - pl3e =3D l4e_to_l3e(*pl4e); - pl3e +=3D l3_table_offset(vpt_start); - pl2e =3D l3e_to_l2e(*pl3e); - pl2e +=3D l2_table_offset(vpt_start); - pl1e =3D l2e_to_l1e(*pl2e); - pl1e +=3D l1_table_offset(vpt_start); + l3t =3D map_l3t_from_l4e(*pl4e); + pl3e =3D l3t + l3_table_offset(vpt_start); + l2t =3D map_l2t_from_l3e(*pl3e); + pl2e =3D l2t + l2_table_offset(vpt_start); + l1t =3D map_l1t_from_l2e(*pl2e); + pl1e =3D l1t + l1_table_offset(vpt_start); for ( count =3D 0; count < nr_pt_pages; count++ ) { l1e_remove_flags(*pl1e, _PAGE_RW); @@ -85,12 +85,20 @@ static __init void mark_pv_pt_pages_rdonly(struct domai= n *d, if ( !((unsigned long)++pl2e & (PAGE_SIZE - 1)) ) { if ( !((unsigned long)++pl3e & (PAGE_SIZE - 1)) ) - pl3e =3D l4e_to_l3e(*++pl4e); - pl2e =3D l3e_to_l2e(*pl3e); + { + unmap_domain_page(l3t); + pl3e =3D l3t =3D map_l3t_from_l4e(*++pl4e); + } + unmap_domain_page(l2t); + pl2e =3D l2t =3D map_l2t_from_l3e(*pl3e); } - pl1e =3D l2e_to_l1e(*pl2e); + unmap_domain_page(l1t); + pl1e =3D l1t =3D map_l1t_from_l2e(*pl2e); } } + unmap_domain_page(l1t); + unmap_domain_page(l2t); + unmap_domain_page(l3t); } =20 static __init void setup_pv_physmap(struct domain *d, unsigned long pgtbl_= pfn, --=20 2.24.1.AMZN