From: Tianyu Lan <ltykernel@xxxxxxxxx> 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@xxxxxxxxxxxxx>
