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    Subject[RFC PATCH V4 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support
    Date
    From: Tianyu Lan <Tianyu.Lan@microsoft.com>

    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.

    There are two exceptions - packets sent by vmbus_sendpacket_
    pagebuffer() and vmbus_sendpacket_mpb_desc(). These packets
    contains IO stack memory address and host will access these memory.
    So add allocation bounce buffer support in vmbus for these packets.

    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.

    Change since v3:
    - Add interface set_memory_decrypted_map() to decrypt memory and
    map bounce buffer in extra address space
    - Remove swiotlb remap function and store the remap address
    returned by set_memory_decrypted_map() in swiotlb mem data structure.
    - Introduce hv_set_mem_enc() to make code more readable in the __set_memory_enc_dec().

    Change since v2:
    - Remove not UIO driver in Isolation VM patch
    - Use vmap_pfn() to replace ioremap_page_range function in
    order to avoid exposing symbol ioremap_page_range() and
    ioremap_page_range()
    - Call hv set mem host visibility hvcall in set_memory_encrypted/decrypted()
    - Enable swiotlb force mode instead of adding Hyper-V dma map/unmap hook
    - Fix code style

    Tianyu Lan (12):
    x86/HV: Initialize shared memory boundary in the Isolation VM.
    x86/HV: Add new hvcall guest address host visibility support
    HV: Mark vmbus ring buffer visible to host in Isolation VM
    HV: Add Write/Read MSR registers via ghcb page
    HV: Add ghcb hvcall support for SNP VM
    HV/Vmbus: Add SNP support for VMbus channel initiate message
    HV/Vmbus: Initialize VMbus ring buffer for Isolation VM
    x86/Swiotlb/HV: Add Swiotlb bounce buffer remap function for HV IVM
    HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM
    HV/Netvsc: Add Isolation VM support for netvsc driver
    HV/Storvsc: Add Isolation VM support for storvsc driver
    x86/HV: Not set memory decrypted/encrypted during kexec alloc/free
    page in IVM

    arch/x86/hyperv/Makefile | 2 +-
    arch/x86/hyperv/hv_init.c | 25 +--
    arch/x86/hyperv/ivm.c | 299 +++++++++++++++++++++++++++++
    arch/x86/include/asm/hyperv-tlfs.h | 18 ++
    arch/x86/include/asm/mshyperv.h | 84 +++++++-
    arch/x86/include/asm/set_memory.h | 2 +
    arch/x86/include/asm/sev-es.h | 4 +
    arch/x86/kernel/cpu/mshyperv.c | 5 +
    arch/x86/kernel/machine_kexec_64.c | 5 +-
    arch/x86/kernel/sev-es-shared.c | 21 +-
    arch/x86/mm/pat/set_memory.c | 34 +++-
    arch/x86/xen/pci-swiotlb-xen.c | 3 +-
    drivers/hv/Kconfig | 1 +
    drivers/hv/channel.c | 48 ++++-
    drivers/hv/connection.c | 71 ++++++-
    drivers/hv/hv.c | 129 +++++++++----
    drivers/hv/hyperv_vmbus.h | 3 +
    drivers/hv/ring_buffer.c | 84 ++++++--
    drivers/hv/vmbus_drv.c | 3 +
    drivers/iommu/hyperv-iommu.c | 62 ++++++
    drivers/net/hyperv/hyperv_net.h | 6 +
    drivers/net/hyperv/netvsc.c | 144 +++++++++++++-
    drivers/net/hyperv/rndis_filter.c | 2 +
    drivers/scsi/storvsc_drv.c | 68 ++++++-
    include/asm-generic/hyperv-tlfs.h | 1 +
    include/asm-generic/mshyperv.h | 53 ++++-
    include/linux/hyperv.h | 16 ++
    include/linux/swiotlb.h | 4 +
    kernel/dma/swiotlb.c | 11 +-
    29 files changed, 1097 insertions(+), 111 deletions(-)
    create mode 100644 arch/x86/hyperv/ivm.c

    --
    2.25.1

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