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Wed, 17 Jul 2024 09:14:21 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH 1/3] x86/mm: Drop duplicate l1_disallow_mask() calls Date: Wed, 17 Jul 2024 17:14:13 +0100 Message-Id: <20240717161415.3586195-2-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240717161415.3586195-1-andrew.cooper3@citrix.com> References: <20240717161415.3586195-1-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: 1721232887975116600 Even in release builds, gdprintk() evalues its parameters for side effects, and l1_disallow_mask() is full of them. Calculate the disallow mask once and reuse the variable. This improves code generation in release builds: add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-207 (-207) Function old new delta mod_l1_entry 1947 1860 -87 get_page_from_l1e 1391 1271 -120 Also, render the bad flags message with a 0x prefix. No practical change. Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 --- xen/arch/x86/mm.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index 648d6dd475ba..0ecea0f707b2 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -842,7 +842,7 @@ get_page_from_l1e( { unsigned long mfn =3D l1e_get_pfn(l1e); struct page_info *page =3D mfn_to_page(_mfn(mfn)); - uint32_t l1f =3D l1e_get_flags(l1e); + uint32_t l1f =3D l1e_get_flags(l1e), disallow; struct vcpu *curr =3D current; struct domain *real_pg_owner; bool write, valid; @@ -853,10 +853,10 @@ get_page_from_l1e( return 0; } =20 - if ( unlikely(l1f & l1_disallow_mask(l1e_owner)) ) + disallow =3D l1_disallow_mask(l1e_owner); + if ( unlikely(l1f & disallow) ) { - gdprintk(XENLOG_WARNING, "Bad L1 flags %x\n", - l1f & l1_disallow_mask(l1e_owner)); + gdprintk(XENLOG_WARNING, "Bad L1 flags %#x\n", l1f & disallow); return -EINVAL; } =20 @@ -2155,11 +2155,12 @@ static int mod_l1_entry(l1_pgentry_t *pl1e, l1_pgen= try_t nl1e, if ( l1e_get_flags(nl1e) & _PAGE_PRESENT ) { struct page_info *page =3D NULL; + uint32_t disallow =3D l1_disallow_mask(pt_dom); =20 - if ( unlikely(l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom)) ) + if ( unlikely(l1e_get_flags(nl1e) & disallow) ) { - gdprintk(XENLOG_WARNING, "Bad L1 flags %x\n", - l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom)); + gdprintk(XENLOG_WARNING, "Bad L1 flags %#x\n", + l1e_get_flags(nl1e) & disallow); return -EINVAL; } =20 --=20 2.39.2