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Thu, 14 Nov 2024 06:58:13 -0800 (PST) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper Subject: [PATCH v3 1/4] x86/mm: introduce helpers to detect super page alignment Date: Thu, 14 Nov 2024 15:57:12 +0100 Message-ID: <20241114145715.59777-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241114145715.59777-1-roger.pau@citrix.com> References: <20241114145715.59777-1-roger.pau@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: 1731596322019116600 Split the code that detects whether the physical and linear address of a mapping request are suitable to be used in an L3 or L2 slot. No functional change intended. Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- Changes since v2: - Fix parenthesization of macro parameter. - Add another usage of IS_L2E_ALIGNED(). Changes since v1: - Make the macros local to map_pages_to_xen(). - Some adjustments to macro logic. --- xen/arch/x86/mm.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index 11933321a3d5..ebb50a7836ac 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -5493,6 +5493,13 @@ int map_pages_to_xen( } \ } while (0) =20 +/* Check if a (virt, mfn) tuple is aligned for a given slot level. */ +#define IS_LnE_ALIGNED(v, m, n) \ + IS_ALIGNED(PFN_DOWN(v) | mfn_x(m), \ + (1UL << (PAGETABLE_ORDER * ((n) - 1))) - 1) +#define IS_L2E_ALIGNED(v, m) IS_LnE_ALIGNED(v, m, 2) +#define IS_L3E_ALIGNED(v, m) IS_LnE_ALIGNED(v, m, 3) + L3T_INIT(current_l3page); =20 while ( nr_mfns !=3D 0 ) @@ -5510,9 +5517,7 @@ int map_pages_to_xen( L3T_LOCK(current_l3page); ol3e =3D *pl3e; =20 - if ( cpu_has_page1gb && - !(((virt >> PAGE_SHIFT) | mfn_x(mfn)) & - ((1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1)) && + if ( cpu_has_page1gb && IS_L3E_ALIGNED(virt, mfn) && nr_mfns >=3D (1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) && !(flags & (_PAGE_PAT | MAP_SMALL_PAGES)) ) { @@ -5631,8 +5636,7 @@ int map_pages_to_xen( if ( !pl2e ) goto out; =20 - if ( ((((virt >> PAGE_SHIFT) | mfn_x(mfn)) & - ((1u << PAGETABLE_ORDER) - 1)) =3D=3D 0) && + if ( IS_L2E_ALIGNED(virt, mfn) && (nr_mfns >=3D (1u << PAGETABLE_ORDER)) && !(flags & (_PAGE_PAT|MAP_SMALL_PAGES)) ) { @@ -5749,9 +5753,7 @@ int map_pages_to_xen( nr_mfns -=3D 1UL; =20 if ( (flags =3D=3D PAGE_HYPERVISOR) && - ((nr_mfns =3D=3D 0) || - ((((virt >> PAGE_SHIFT) | mfn_x(mfn)) & - ((1u << PAGETABLE_ORDER) - 1)) =3D=3D 0)) ) + ((nr_mfns =3D=3D 0) || IS_L2E_ALIGNED(virt, mfn)) ) { unsigned long base_mfn; const l1_pgentry_t *l1t; @@ -5802,9 +5804,7 @@ int map_pages_to_xen( check_l3: if ( cpu_has_page1gb && (flags =3D=3D PAGE_HYPERVISOR) && - ((nr_mfns =3D=3D 0) || - !(((virt >> PAGE_SHIFT) | mfn_x(mfn)) & - ((1UL << (L3_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1))) ) + ((nr_mfns =3D=3D 0) || IS_L3E_ALIGNED(virt, mfn)) ) { unsigned long base_mfn; const l2_pgentry_t *l2t; @@ -5848,6 +5848,9 @@ int map_pages_to_xen( } } =20 +#undef IS_L3E_ALIGNED +#undef IS_L2E_ALIGNED +#undef IS_LnE_ALIGNED #undef flush_flags =20 rc =3D 0; --=20 2.46.0