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SubjectRE: [PATCH V7 0/5] x86/Hyper-V: Add Hyper-V Isolation VM support(Second part)
Date
From: Tianyu Lan <ltykernel@gmail.com> Sent: Sunday, December 12, 2021 11:14 PM
>
> 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
> hyperv_cc_platform_has().
> * Add comment in pci-swiotlb-xen.c to explain why add
> dependency between hyperv_swiotlb_detect() and pci_
> xen_swiotlb_detect().
> * 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(-)
>
> --
> 2.25.1

For the entire series,

Reviewed-by: Michael Kelley <mikelley@microsoft.com>

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