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Sun, 30 May 2021 08:06:53 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [RFC PATCH V3 11/11] HV/Storvsc: Add Isolation VM support for storvsc driver Date: Sun, 30 May 2021 11:06:28 -0400 Message-Id: <20210530150628.2063957-12-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210530150628.2063957-1-ltykernel@gmail.com> References: <20210530150628.2063957-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" From: Tianyu Lan In Isolation VM, all shared memory with host needs to mark visible to host via hvcall. vmbus_establish_gpadl() has already done it for storvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_ mpb_desc() still need to handle. Use DMA API to map/umap these memory during sending/receiving packet and Hyper-V DMA ops callback will use swiotlb function to allocate bounce buffer and copy data from/to bounce buffer. Signed-off-by: Tianyu Lan --- drivers/scsi/storvsc_drv.c | 63 +++++++++++++++++++++++++++++++++++--- 1 file changed, 58 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 403753929320..32da419c134e 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include #include #include @@ -427,6 +429,8 @@ struct storvsc_cmd_request { u32 payload_sz; =20 struct vstor_packet vstor_packet; + u32 hvpg_count; + struct hv_dma_range *dma_range; }; =20 =20 @@ -1267,6 +1271,7 @@ static void storvsc_on_channel_callback(void *context) struct hv_device *device; struct storvsc_device *stor_device; struct Scsi_Host *shost; + int i; =20 if (channel->primary_channel !=3D NULL) device =3D channel->primary_channel->device_obj; @@ -1321,6 +1326,17 @@ static void storvsc_on_channel_callback(void *contex= t) request =3D (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); } =20 + if (request->dma_range) { + for (i =3D 0; i < request->hvpg_count; i++) + dma_unmap_page(&device->device, + request->dma_range[i].dma, + request->dma_range[i].mapping_size, + request->vstor_packet.vm_srb.data_in + =3D=3D READ_TYPE ? + DMA_FROM_DEVICE : DMA_TO_DEVICE); + kfree(request->dma_range); + } + storvsc_on_receive(stor_device, packet, request); continue; } @@ -1817,7 +1833,9 @@ static int storvsc_queuecommand(struct Scsi_Host *hos= t, struct scsi_cmnd *scmnd) unsigned int hvpgoff, hvpfns_to_add; unsigned long offset_in_hvpg =3D offset_in_hvpage(sgl->offset); unsigned int hvpg_count =3D HVPFN_UP(offset_in_hvpg + length); + dma_addr_t dma; u64 hvpfn; + u32 size; =20 if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { =20 @@ -1831,6 +1849,13 @@ static int storvsc_queuecommand(struct Scsi_Host *ho= st, struct scsi_cmnd *scmnd) payload->range.len =3D length; payload->range.offset =3D offset_in_hvpg; =20 + cmd_request->dma_range =3D kcalloc(hvpg_count, + sizeof(*cmd_request->dma_range), + GFP_ATOMIC); + if (!cmd_request->dma_range) { + ret =3D -ENOMEM; + goto free_payload; + } =20 for (i =3D 0; sgl !=3D NULL; sgl =3D sg_next(sgl)) { /* @@ -1854,9 +1879,30 @@ static int storvsc_queuecommand(struct Scsi_Host *ho= st, struct scsi_cmnd *scmnd) * last sgl should be reached at the same time that * the PFN array is filled. */ - while (hvpfns_to_add--) - payload->range.pfn_array[i++] =3D hvpfn++; + while (hvpfns_to_add--) { + size =3D min(HV_HYP_PAGE_SIZE - offset_in_hvpg, + (unsigned long)length); + dma =3D dma_map_page(&dev->device, + pfn_to_page(hvpfn++), + offset_in_hvpg, size, + scmnd->sc_data_direction); + if (dma_mapping_error(&dev->device, dma)) { + ret =3D -ENOMEM; + goto free_dma_range; + } + + if (offset_in_hvpg) { + payload->range.offset =3D dma & ~HV_HYP_PAGE_MASK; + offset_in_hvpg =3D 0; + } + + cmd_request->dma_range[i].dma =3D dma; + cmd_request->dma_range[i].mapping_size =3D size; + payload->range.pfn_array[i++] =3D dma >> HV_HYP_PAGE_SHIFT; + length -=3D size; + } } + cmd_request->hvpg_count =3D hvpg_count; } =20 cmd_request->payload =3D payload; @@ -1867,13 +1913,20 @@ static int storvsc_queuecommand(struct Scsi_Host *h= ost, struct scsi_cmnd *scmnd) put_cpu(); =20 if (ret =3D=3D -EAGAIN) { - if (payload_sz > sizeof(cmd_request->mpb)) - kfree(payload); /* no more space */ - return SCSI_MLQUEUE_DEVICE_BUSY; + ret =3D SCSI_MLQUEUE_DEVICE_BUSY; + goto free_dma_range; } =20 return 0; + +free_dma_range: + kfree(cmd_request->dma_range); + +free_payload: + if (payload_sz > sizeof(cmd_request->mpb)) + kfree(payload); + return ret; } =20 static struct scsi_host_template scsi_driver =3D { --=20 2.25.1