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d="scan'208";a="8673772" From: Andrew Cooper To: Xen-devel Date: Wed, 13 Nov 2019 13:41:36 +0000 Message-ID: <20191113134136.16180-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH for-4.13] AMD/IOMMU: Fix crash in 'V' debugkey X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Andrew Cooper , Jan Beulich Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) c/s bb038f31168 "AMD/IOMMU: replace INTREMAP_ENTRIES" introduces a call to intremap_table_entries() in dump_intremap_table() before tbl.ptr is checked for NULL. intremap_table_entries() internally uses virt_to_page() which falls over ASSERT(va >=3D XEN_VIRT_START); in __virt_to_page(). Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Juergen Gross For 4.13. Regression vs 4.12 --- xen/drivers/passthrough/amd/iommu_intr.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/xen/drivers/passthrough/amd/iommu_intr.c b/xen/drivers/passthr= ough/amd/iommu_intr.c index 1eed60f265..5e92c023f8 100644 --- a/xen/drivers/passthrough/amd/iommu_intr.c +++ b/xen/drivers/passthrough/amd/iommu_intr.c @@ -847,11 +847,13 @@ static void dump_intremap_table(const struct amd_iomm= u *iommu, union irte_cptr tbl, const struct ivrs_mappings *ivrs_mapping) { - unsigned int count, nr =3D intremap_table_entries(tbl.ptr, iommu); + unsigned int count, nr; =20 if ( !tbl.ptr ) return; =20 + nr =3D intremap_table_entries(tbl.ptr, iommu); + for ( count =3D 0; count < nr; count++ ) { if ( iommu->ctrl.ga_en --=20 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel