Message ID | 20210201144814.2701-5-parri.andrea@gmail.com (mailing list archive) |
---|---|
State | Not Applicable |
Delegated to: | Netdev Maintainers |
Headers | show |
Series | Drivers: hv: vmbus: Restrict devices and configurations on 'isolated' guests | expand |
From: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Sent: Monday, February 1, 2021 6:48 AM > > Restrict the NVSP protocol version(s) that will be negotiated with the > host to be NVSP_PROTOCOL_VERSION_61 or greater if the guest is running > isolated. Moreover, do not advertise the SR-IOV capability and ignore > NVSP_MSG_4_TYPE_SEND_VF_ASSOCIATION messages in isolated guests, which > are not supposed to support SR-IOV. This reduces the footprint of the > code that will be exercised by Confidential VMs and hence the exposure > to bugs and vulnerabilities. > > Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> > Acked-by: Jakub Kicinski <kuba@kernel.org> > Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: netdev@vger.kernel.org > --- > drivers/net/hyperv/netvsc.c | 18 ++++++++++++++++-- > 1 file changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c > index 1510a236aa341..51005f2d4a821 100644 > --- a/drivers/net/hyperv/netvsc.c > +++ b/drivers/net/hyperv/netvsc.c > @@ -22,6 +22,7 @@ > #include <linux/prefetch.h> > > #include <asm/sync_bitops.h> > +#include <asm/mshyperv.h> > > #include "hyperv_net.h" > #include "netvsc_trace.h" > @@ -544,7 +545,10 @@ static int negotiate_nvsp_ver(struct hv_device *device, > init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; > > if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { > - init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; > + if (hv_is_isolation_supported()) > + netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n"); > + else > + init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; > > /* Teaming bit is needed to receive link speed updates */ > init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; > @@ -591,6 +595,13 @@ static int netvsc_connect_vsp(struct hv_device *device, > goto cleanup; > } > > + if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) { > + netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n", > + net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61); > + ret = -EPROTO; > + goto cleanup; > + } > + > pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); > > /* Send the ndis version */ > @@ -1357,7 +1368,10 @@ static void netvsc_receive_inband(struct net_device *ndev, > break; > > case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: > - netvsc_send_vf(ndev, nvmsg, msglen); > + if (hv_is_isolation_supported()) > + netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n"); > + else > + netvsc_send_vf(ndev, nvmsg, msglen); > break; > } > } > -- > 2.25.1 Reviewed-by: Michael Kelley <mikelley@microsoft.com>
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 1510a236aa341..51005f2d4a821 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -22,6 +22,7 @@ #include <linux/prefetch.h> #include <asm/sync_bitops.h> +#include <asm/mshyperv.h> #include "hyperv_net.h" #include "netvsc_trace.h" @@ -544,7 +545,10 @@ static int negotiate_nvsp_ver(struct hv_device *device, init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { - init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; + if (hv_is_isolation_supported()) + netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n"); + else + init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; /* Teaming bit is needed to receive link speed updates */ init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; @@ -591,6 +595,13 @@ static int netvsc_connect_vsp(struct hv_device *device, goto cleanup; } + if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) { + netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n", + net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61); + ret = -EPROTO; + goto cleanup; + } + pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); /* Send the ndis version */ @@ -1357,7 +1368,10 @@ static void netvsc_receive_inband(struct net_device *ndev, break; case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: - netvsc_send_vf(ndev, nvmsg, msglen); + if (hv_is_isolation_supported()) + netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n"); + else + netvsc_send_vf(ndev, nvmsg, msglen); break; } }