From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46065) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gL50I-0006y5-9K for qemu-devel@nongnu.org; Fri, 09 Nov 2018 06:31:15 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gL50G-0001xt-CR for qemu-devel@nongnu.org; Fri, 09 Nov 2018 06:31:10 -0500 From: Eric Auger Date: Fri, 9 Nov 2018 12:29:52 +0100 Message-Id: <20181109112957.10067-14-eric.auger@redhat.com> In-Reply-To: <20181109112957.10067-1-eric.auger@redhat.com> References: <20181109112957.10067-1-eric.auger@redhat.com> Subject: [Qemu-devel] [RFC v8 13/18] virtio_iommu: Handle reserved regions in translation process List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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, jean-philippe.brucker@arm.com Cc: kevin.tian@intel.com, tn@semihalf.com, bharat.bhushan@nxp.com, peterx@redhat.com 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 --- hw/virtio/virtio-iommu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index e5ab3db834..c88aecf18f 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -743,6 +743,7 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, viommu_interval interval; bool bypass_allowed; bool read_fault, write_fault; + struct virtio_iommu_probe_resv_mem *reg; interval.low = addr; interval.high = addr + 1; @@ -775,6 +776,21 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, goto unlock; } + reg = g_tree_lookup(ep->reserved_regions, (gpointer)(&interval)); + if (reg) { + switch (reg->subtype) { + case VIRTIO_IOMMU_RESV_MEM_T_MSI: + entry.perm = flag; + break; + case VIRTIO_IOMMU_RESV_MEM_T_RESERVED: + default: + virtio_iommu_report_fault(s, VIRTIO_IOMMU_FAULT_R_MAPPING, + 0, sid, addr); + break; + } + goto unlock; + } + if (!ep->domain) { if (!bypass_allowed) { qemu_log_mask(LOG_GUEST_ERROR, -- 2.17.2