-----Original Message-----
From: Tianyu Lan <redacted>
Sent: Monday, December 13, 2021 2:14 AM
To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang <haiyangz@microsoft.com>; Stephen
Hemminger [off-list ref]; wei.liu@kernel.org; Dexuan Cui [off-list ref];
tglx@linutronix.de; mingo@redhat.com; bp@alien8.de; dave.hansen@linux.intel.com;
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robin.murphy@arm.com; thomas.lendacky@amd.com; Tianyu Lan [off-list ref];
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Subject: [PATCH V7 5/5] net: netvsc: Add Isolation VM support for netvsc driver

From: Tianyu Lan <redacted>

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 <redacted>
---
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>