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Wed, 24 Jan 2024 00:45:03 -0800 (PST) From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Jan Beulich , Andrew Cooper , George Dunlap , Wei Liu Subject: [PATCH] x86/p2m-pt: fix off by one in entry check assert Date: Wed, 24 Jan 2024 09:37:42 +0100 Message-ID: <20240124083742.24324-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.43.0 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: 1706085929173100001 The MMIO RO rangeset overlap check is bogus: the rangeset is inclusive so t= he passed end mfn should be the last mfn to be mapped (not last + 1). Fixes: 6fa1755644d0 ('amd/npt/shadow: replace assert that prevents creating= 2M/1G MMIO entries') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: George Dunlap --- xen/arch/x86/mm/p2m-pt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c index 640a11f5647f..348130d0dd3b 100644 --- a/xen/arch/x86/mm/p2m-pt.c +++ b/xen/arch/x86/mm/p2m-pt.c @@ -552,7 +552,7 @@ static void check_entry(mfn_t mfn, p2m_type_t new, p2m_= type_t old, if ( new =3D=3D p2m_mmio_direct ) ASSERT(!mfn_eq(mfn, INVALID_MFN) && !rangeset_overlaps_range(mmio_ro_ranges, mfn_x(mfn), - mfn_x(mfn) + (1UL << order))); + mfn_x(mfn) + (1UL << order) - 1)); else if ( p2m_allows_invalid_mfn(new) || new =3D=3D p2m_invalid || new =3D=3D p2m_mmio_dm ) ASSERT(mfn_valid(mfn) || mfn_eq(mfn, INVALID_MFN)); --=20 2.43.0