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Fri, 27 Aug 2021 10:21:30 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, gregkh@linuxfoundation.org, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, brijesh.singh@amd.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, pgonda@google.com, martin.b.radev@gmail.com, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, aneesh.kumar@linux.ibm.com, krish.sadhukhan@oracle.com, saravanand@fb.com, linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, rientjes@google.com, ardb@kernel.org, michael.h.kelley@microsoft.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, parri.andrea@gmail.com, dave.hansen@intel.com Subject: [PATCH V4 04/13] hyperv: Mark vmbus ring buffer visible to host in Isolation VM Date: Fri, 27 Aug 2021 13:21:02 -0400 Message-Id: <20210827172114.414281-5-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210827172114.414281-1-ltykernel@gmail.com> References: <20210827172114.414281-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Tianyu Lan Mark vmbus ring buffer visible with set_memory_decrypted() when establish gpadl handle. Signed-off-by: Tianyu Lan --- Change since v3: * Change vmbus_teardown_gpadl() parameter and put gpadl handle, buffer and buffer size in the struct vmbus_gpadl. --- drivers/hv/channel.c | 36 ++++++++++++++++++++++++++++----- drivers/net/hyperv/hyperv_net.h | 1 + drivers/net/hyperv/netvsc.c | 16 +++++++++++---- drivers/uio/uio_hv_generic.c | 14 +++++++++++-- include/linux/hyperv.h | 8 +++++++- 5 files changed, 63 insertions(+), 12 deletions(-) diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index f3761c73b074..82650beb3af0 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -474,6 +475,13 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, if (ret) return ret; + ret = set_memory_decrypted((unsigned long)kbuffer, + HVPFN_UP(size)); + if (ret) { + pr_warn("Failed to set host visibility for new GPADL %d.\n", ret); + return ret; + } + init_completion(&msginfo->waitevent); msginfo->waiting_channel = channel; @@ -549,6 +557,11 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel, } kfree(msginfo); + + if (ret) + set_memory_encrypted((unsigned long)kbuffer, + HVPFN_UP(size)); + return ret; } @@ -639,6 +652,7 @@ static int __vmbus_open(struct vmbus_channel *newchannel, struct vmbus_channel_open_channel *open_msg; struct vmbus_channel_msginfo *open_info = NULL; struct page *page = newchannel->ringbuffer_page; + struct vmbus_gpadl gpadl; u32 send_pages, recv_pages; unsigned long flags; int err; @@ -759,7 +773,10 @@ static int __vmbus_open(struct vmbus_channel *newchannel, error_free_info: kfree(open_info); error_free_gpadl: - vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); + gpadl.gpadl_handle = newchannel->ringbuffer_gpadlhandle; + gpadl.buffer = page_address(newchannel->ringbuffer_page); + gpadl.size = (send_pages + recv_pages) << PAGE_SHIFT; + vmbus_teardown_gpadl(newchannel, &gpadl); newchannel->ringbuffer_gpadlhandle = 0; error_clean_ring: hv_ringbuffer_cleanup(&newchannel->outbound); @@ -806,7 +823,7 @@ EXPORT_SYMBOL_GPL(vmbus_open); /* * vmbus_teardown_gpadl -Teardown the specified GPADL handle */ -int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) +int vmbus_teardown_gpadl(struct vmbus_channel *channel, struct vmbus_gpadl *gpadl) { struct vmbus_channel_gpadl_teardown *msg; struct vmbus_channel_msginfo *info; @@ -825,7 +842,7 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; msg->child_relid = channel->offermsg.child_relid; - msg->gpadl = gpadl_handle; + msg->gpadl = gpadl->gpadl_handle; spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_add_tail(&info->msglistentry, @@ -859,6 +876,12 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); kfree(info); + + ret = set_memory_encrypted((unsigned long)gpadl->buffer, + HVPFN_UP(gpadl->size)); + if (ret) + pr_warn("Fail to set mem host visibility in GPADL teardown %d.\n", ret); + return ret; } EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); @@ -896,6 +919,7 @@ void vmbus_reset_channel_cb(struct vmbus_channel *channel) static int vmbus_close_internal(struct vmbus_channel *channel) { struct vmbus_channel_close_channel *msg; + struct vmbus_gpadl gpadl; int ret; vmbus_reset_channel_cb(channel); @@ -934,8 +958,10 @@ static int vmbus_close_internal(struct vmbus_channel *channel) /* Tear down the gpadl for the channel's ring buffer */ else if (channel->ringbuffer_gpadlhandle) { - ret = vmbus_teardown_gpadl(channel, - channel->ringbuffer_gpadlhandle); + gpadl.gpadl_handle = channel->ringbuffer_gpadlhandle; + gpadl.buffer = page_address(channel->ringbuffer_page); + gpadl.size = channel->ringbuffer_pagecount; + ret = vmbus_teardown_gpadl(channel, &gpadl); if (ret) { pr_err("Close failed: teardown gpadl return %d\n", ret); /* diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index bc48855dff10..aa7c9962dbd8 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -1082,6 +1082,7 @@ struct netvsc_device { /* Send buffer allocated by us */ void *send_buf; + u32 send_buf_size; u32 send_buf_gpadl_handle; u32 send_section_cnt; u32 send_section_size; diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 7bd935412853..f19bffff6a63 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -276,11 +276,14 @@ static void netvsc_teardown_recv_gpadl(struct hv_device *device, struct netvsc_device *net_device, struct net_device *ndev) { + struct vmbus_gpadl gpadl; int ret; if (net_device->recv_buf_gpadl_handle) { - ret = vmbus_teardown_gpadl(device->channel, - net_device->recv_buf_gpadl_handle); + gpadl.gpadl_handle = net_device->recv_buf_gpadl_handle; + gpadl.buffer = net_device->recv_buf; + gpadl.size = net_device->recv_buf_size; + ret = vmbus_teardown_gpadl(device->channel, &gpadl); /* If we failed here, we might as well return and have a leak * rather than continue and a bugchk @@ -298,11 +301,15 @@ static void netvsc_teardown_send_gpadl(struct hv_device *device, struct netvsc_device *net_device, struct net_device *ndev) { + struct vmbus_gpadl gpadl; int ret; if (net_device->send_buf_gpadl_handle) { - ret = vmbus_teardown_gpadl(device->channel, - net_device->send_buf_gpadl_handle); + gpadl.gpadl_handle = net_device->send_buf_gpadl_handle; + gpadl.buffer = net_device->send_buf; + gpadl.size = net_device->send_buf_size; + + ret = vmbus_teardown_gpadl(device->channel, &gpadl); /* If we failed here, we might as well return and have a leak * rather than continue and a bugchk @@ -463,6 +470,7 @@ static int netvsc_init_buf(struct hv_device *device, ret = -ENOMEM; goto cleanup; } + net_device->send_buf_size = buf_size; /* Establish the gpadl handle for this buffer on this * channel. Note: This call uses the vmbus connection rather diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 652fe2547587..13c5df8dd11d 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -179,14 +179,24 @@ hv_uio_new_channel(struct vmbus_channel *new_sc) static void hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata) { + struct vmbus_gpadl gpadl; + if (pdata->send_gpadl) { - vmbus_teardown_gpadl(dev->channel, pdata->send_gpadl); + gpadl.gpadl_handle = pdata->send_gpadl; + gpadl.buffer = pdata->send_buf; + gpadl.size = SEND_BUFFER_SIZE; + + vmbus_teardown_gpadl(dev->channel, &gpadl); pdata->send_gpadl = 0; vfree(pdata->send_buf); } if (pdata->recv_gpadl) { - vmbus_teardown_gpadl(dev->channel, pdata->recv_gpadl); + gpadl.gpadl_handle = pdata->recv_gpadl; + gpadl.buffer = pdata->recv_buf; + gpadl.size = RECV_BUFFER_SIZE; + + vmbus_teardown_gpadl(dev->channel, &gpadl); pdata->recv_gpadl = 0; vfree(pdata->recv_buf); } diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index ddc8713ce57b..757e09606fd3 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -803,6 +803,12 @@ struct vmbus_device { #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096 +struct vmbus_gpadl { + u32 gpadl_handle; + u32 size; + void *buffer; +}; + struct vmbus_channel { struct list_head listentry; @@ -1195,7 +1201,7 @@ extern int vmbus_establish_gpadl(struct vmbus_channel *channel, u32 *gpadl_handle); extern int vmbus_teardown_gpadl(struct vmbus_channel *channel, - u32 gpadl_handle); + struct vmbus_gpadl *gpadl); void vmbus_reset_channel_cb(struct vmbus_channel *channel);