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bh=oYVFAVqYGf5neJ3Wr0VtiQUIg29jzhHrC/alVMqoehE=; b=azdGvDOIKHwCKt9lTyc6CILGls8H09AXU4IbRJhUtI+l6N3fjogVWuCg4gMe7nb0GpAAXY 7hPvXVCRahTlGE9u9ccqdg4/mQIaCgSoPARm39UnfM6gJGN3gH3esZKHCnXA2k77zyW9hk NY/99vGB4HGR7P56g5FlTbMqwGS8Tns= X-MC-Unique: fd_208t-M4WH4m7eLJ7wsA-1 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, mst@redhat.com, armbru@redhat.com, pbonzini@redhat.com, jean-philippe@linaro.org, bbhushan2@marvell.com, peterx@redhat.com Subject: [PATCH v6 3/5] virtio-iommu: Handle reserved regions in the translation process Date: Fri, 26 Jun 2020 12:30:55 +0200 Message-Id: <20200626103057.11263-4-eric.auger@redhat.com> In-Reply-To: <20200626103057.11263-1-eric.auger@redhat.com> References: <20200626103057.11263-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" When translating an address we need to check if it belongs to a reserved virtual address range. If it does, there are 2 cases: - it belongs to a RESERVED region: the guest should neither use this address in a MAP not instruct the end-point to DMA on them. We report an error - It belongs to an MSI region: we bypass the translation. Signed-off-by: Eric Auger Reviewed-by: Peter Xu Reviewed-by: Jean-Philippe Brucker Reviewed-by: Michael S. Tsirkin --- v1 -> v2: - use addr when testing addr belongs to the reserved region and use a block local variable --- hw/virtio/virtio-iommu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 5e72fd53a1..4a50e24d21 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -603,6 +603,7 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemory= Region *mr, hwaddr addr, uint32_t sid, flags; bool bypass_allowed; bool found; + int i; =20 interval.low =3D addr; interval.high =3D addr + 1; @@ -636,6 +637,25 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemor= yRegion *mr, hwaddr addr, goto unlock; } =20 + for (i =3D 0; i < s->nb_reserved_regions; i++) { + ReservedRegion *reg =3D &s->reserved_regions[i]; + + if (addr >=3D reg->low && addr <=3D reg->high) { + switch (reg->type) { + case VIRTIO_IOMMU_RESV_MEM_T_MSI: + entry.perm =3D flag; + break; + case VIRTIO_IOMMU_RESV_MEM_T_RESERVED: + default: + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + VIRTIO_IOMMU_FAULT_F_ADDRESS, + sid, addr); + break; + } + goto unlock; + } + } + if (!ep->domain) { if (!bypass_allowed) { error_report_once("%s %02x:%02x.%01x not attached to any domai= n", --=20 2.20.1