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SubjectRE: [PATCH V7 5/5] net: netvsc: Add Isolation VM support for netvsc driver
Date


> -----Original Message-----
> From: Tianyu Lan <ltykernel@gmail.com>
> Sent: Monday, December 13, 2021 2:14 AM
> To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang <haiyangz@microsoft.com>; Stephen
> Hemminger <sthemmin@microsoft.com>; wei.liu@kernel.org; Dexuan Cui <decui@microsoft.com>;
> tglx@linutronix.de; mingo@redhat.com; bp@alien8.de; dave.hansen@linux.intel.com;
> x86@kernel.org; hpa@zytor.com; davem@davemloft.net; kuba@kernel.org; jejb@linux.ibm.com;
> martin.petersen@oracle.com; arnd@arndb.de; hch@infradead.org; m.szyprowski@samsung.com;
> robin.murphy@arm.com; thomas.lendacky@amd.com; Tianyu Lan <Tianyu.Lan@microsoft.com>;
> Michael Kelley (LINUX) <mikelley@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 <vkuznets@redhat.com>; brijesh.singh@amd.com;
> konrad.wilk@oracle.com; hch@lst.de; joro@8bytes.org; parri.andrea@gmail.com;
> dave.hansen@intel.com
> Subject: [PATCH V7 5/5] net: netvsc: Add Isolation VM support for netvsc driver
>
> From: Tianyu Lan <Tianyu.Lan@microsoft.com>
>
> In Isolation VM, all shared memory with host needs to mark visible
> to host via hvcall. vmbus_establish_gpadl() has already done it for
> netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_
> pagebuffer() stills need to be handled. Use DMA API to map/umap
> these memory during sending/receiving packet and Hyper-V swiotlb
> bounce buffer dma address will be returned. The swiotlb bounce buffer
> has been masked to be visible to host during boot up.
>
> rx/tx ring buffer is allocated via vzalloc() and they need to be
> mapped into unencrypted address space(above vTOM) before sharing
> with host and accessing. Add hv_map/unmap_memory() to map/umap rx
> /tx ring buffer.
>
> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> ---
> Change since v3:
> * Replace HV_HYP_PAGE_SIZE with PAGE_SIZE and virt_to_hvpfn()
> with vmalloc_to_pfn() in the hv_map_memory()
>
> Change since v2:
> * Add hv_map/unmap_memory() to map/umap rx/tx ring buffer.
> ---
> arch/x86/hyperv/ivm.c | 28 ++++++
> drivers/hv/hv_common.c | 11 +++
> drivers/net/hyperv/hyperv_net.h | 5 ++
> drivers/net/hyperv/netvsc.c | 136 +++++++++++++++++++++++++++++-
> drivers/net/hyperv/netvsc_drv.c | 1 +
> drivers/net/hyperv/rndis_filter.c | 2 +
> include/asm-generic/mshyperv.h | 2 +
> include/linux/hyperv.h | 5 ++
> 8 files changed, 187 insertions(+), 3 deletions(-)
>

Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>

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