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d="scan'208";a="58889162" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH 2/8] x86/boot: Better describe the pagetable relocation loops Date: Tue, 30 Nov 2021 10:04:39 +0000 Message-ID: <20211130100445.31156-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20211130100445.31156-1-andrew.cooper3@citrix.com> References: <20211130100445.31156-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1638266730146100001 The first loop relocates all reachable non-leaf entries in idle_pg_table[], which includes l2_xenmap[511]'s reference to l1_fixmap_x[]. The second loop relocates only leaf mappings in l2_xenmap[], so update the skip condition to be opposite to the first loop. No functional change. Signed-off-by: Andrew Cooper Acked-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu --- xen/arch/x86/setup.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index 6f241048425c..495b4b7d51fb 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -1245,7 +1245,7 @@ void __init noreturn __start_xen(unsigned long mbi_p) barrier(); move_memory(e, XEN_IMG_OFFSET, _end - _start, 1); =20 - /* Walk initial pagetables, relocating page directory entries.= */ + /* Walk idle_pg_table, relocating non-leaf entries. */ pl4e =3D __va(__pa(idle_pg_table)); for ( i =3D 0 ; i < L4_PAGETABLE_ENTRIES; i++, pl4e++ ) { @@ -1277,18 +1277,18 @@ void __init noreturn __start_xen(unsigned long mbi_= p) } } =20 - /* The only data mappings to be relocated are in the Xen area.= */ - pl2e =3D __va(__pa(l2_xenmap)); - BUG_ON(using_2M_mapping() && l2_table_offset((unsigned long)_erodata) =3D=3D l2_table_offset((unsigned long)_stext)); =20 + /* Walk l2_xenmap[], relocating 2M superpage leaves. */ + pl2e =3D __va(__pa(l2_xenmap)); for ( i =3D 0; i < L2_PAGETABLE_ENTRIES; i++, pl2e++ ) { unsigned int flags; =20 if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) || + !(l2e_get_flags(*pl2e) & _PAGE_PSE) || (l2e_get_pfn(*pl2e) >=3D pte_update_limit) ) continue; =20 --=20 2.11.0