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Subject[PATCH V7 0/5] x86/Hyper-V: Add Hyper-V Isolation VM support(Second part)
From: Tianyu Lan <>

Hyper-V provides two kinds of Isolation VMs. VBS(Virtualization-based
security) and AMD SEV-SNP unenlightened Isolation VMs. This patchset
is to add support for these Isolation VM support in Linux.

The memory of these vms are encrypted and host can't access guest
memory directly. Hyper-V provides new host visibility hvcall and
the guest needs to call new hvcall to mark memory visible to host
before sharing memory with host. For security, all network/storage
stack memory should not be shared with host and so there is bounce
buffer requests.

Vmbus channel ring buffer already plays bounce buffer role because
all data from/to host needs to copy from/to between the ring buffer
and IO stack memory. So mark vmbus channel ring buffer visible.

For SNP isolation VM, guest needs to access the shared memory via
extra address space which is specified by Hyper-V CPUID HYPERV_CPUID_
ISOLATION_CONFIG. The access physical address of the shared memory
should be bounce buffer memory GPA plus with shared_gpa_boundary
reported by CPUID.

This patchset is to enable swiotlb bounce buffer for netvsc/storvsc
drivers in Isolation VM.

Change since v6:
* Fix compile error in hv_init.c and mshyperv.c when swiotlb
is not enabled.
* Change the order in the cc_platform_has() and check sev first.

Change sicne v5:
* Modify "Swiotlb" to "swiotlb" in commit log.
* Remove CONFIG_HYPERV check in the hyperv_cc_platform_has()

Change since v4:
* Remove Hyper-V IOMMU IOMMU_INIT_FINISH related functions
and set SWIOTLB_FORCE and swiotlb_unencrypted_base in the
ms_hyperv_init_platform(). Call swiotlb_update_mem_attributes()
in the hyperv_init().

Change since v3:
* Fix boot up failure on the host with mem_encrypt=on.
Move calloing of set_memory_decrypted() back from
swiotlb_init_io_tlb_mem to swiotlb_late_init_with_tbl()
and rmem_swiotlb_device_init().
* Change code style of checking GUEST_MEM attribute in the
* Add comment in pci-swiotlb-xen.c to explain why add
dependency between hyperv_swiotlb_detect() and pci_
* Return directly when fails to allocate Hyper-V swiotlb
buffer in the hyperv_iommu_swiotlb_init().

Change since v2:
* Remove Hyper-V dma ops and dma_alloc/free_noncontiguous. Add
hv_map/unmap_memory() to map/umap netvsc rx/tx ring into extra
address space.
* Leave mem->vaddr in swiotlb code with phys_to_virt(mem->start)
when fail to remap swiotlb memory.

Change since v1:
* Add Hyper-V Isolation support check in the cc_platform_has()
and return true for guest memory encrypt attr.
* Remove hv isolation check in the sev_setup_arch()

Tianyu Lan (5):
swiotlb: Add swiotlb bounce buffer remap function for HV IVM
x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()
hyper-v: Enable swiotlb bounce buffer for Isolation VM
scsi: storvsc: Add Isolation VM support for storvsc driver
net: netvsc: Add Isolation VM support for netvsc driver

arch/x86/hyperv/hv_init.c | 12 +++
arch/x86/hyperv/ivm.c | 28 ++++++
arch/x86/kernel/cc_platform.c | 8 ++
arch/x86/kernel/cpu/mshyperv.c | 15 +++-
drivers/hv/hv_common.c | 11 +++
drivers/hv/vmbus_drv.c | 4 +
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 +
drivers/scsi/storvsc_drv.c | 37 ++++----
include/asm-generic/mshyperv.h | 2 +
include/linux/hyperv.h | 6 ++
include/linux/swiotlb.h | 6 ++
kernel/dma/swiotlb.c | 43 +++++++++-
15 files changed, 294 insertions(+), 22 deletions(-)


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