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Tue, 22 Oct 2024 15:40:00 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , "Daniel P . Smith" Subject: [PATCH 2/3] x86/boot: Simplify address calculations in move_memory() Date: Tue, 22 Oct 2024 23:39:53 +0100 Message-Id: <20241022223954.432554-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241022223954.432554-1-andrew.cooper3@citrix.com> References: <20241022223954.432554-1-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: 1729636843741116600 Given that soffs is the offset into the 2M superpage, start =3D (src - soffs) >> PAGE_SIFT is a complicated expression for the frame address of the containing superpa= ge. Except, start is converted straight back to a byte address to use, so the shifting is unnecessary too. The only done with the mapped pointer is to have soffs added back on for the memmove() call. bootstrap_map_addr() passes through the offset, so we can pass src directly in and simplify the memmove() call too. For the end mapp= ing address, this simplifies to just src + sz too. The same reasoning holds for dst and doffs. No functional change. Signed-off-by: Andrew Cooper Reviewed-by: Daniel P. Smith --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Daniel P. Smith --- xen/arch/x86/setup.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index 46a0b3093c2c..152cd696d6c2 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -492,31 +492,26 @@ static void __init noinline move_memory( =20 while ( size ) { - unsigned int start /* frame */; unsigned int end /* mapsz */; unsigned int soffs =3D src & mask; unsigned int doffs =3D dst & mask; unsigned int sz; void *d, *s; =20 - start =3D (src - soffs) >> PAGE_SHIFT; end =3D soffs + size; if ( end > blksz ) end =3D blksz; sz =3D end - soffs; - s =3D bootstrap_map_addr(pfn_to_paddr(start), - pfn_to_paddr(start) + end); + s =3D bootstrap_map_addr(src, src + sz); =20 - start =3D (dst - doffs) >> PAGE_SHIFT; end =3D doffs + size; if ( end > blksz ) end =3D blksz; if ( sz > end - doffs ) sz =3D end - doffs; - d =3D bootstrap_map_addr(pfn_to_paddr(start), - pfn_to_paddr(start) + end); + d =3D bootstrap_map_addr(dst, dst + sz); =20 - memmove(d + doffs, s + soffs, sz); + memmove(d, s, sz); =20 dst +=3D sz; src +=3D sz; --=20 2.39.5