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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