From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> 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 in Isolation VM. Add Hyper-V dma ops and provide dma_alloc/free_ noncontiguous and vmap/vunmap_noncontiguous callback. Allocate rx/tx ring via dma_alloc_noncontiguous() and map them into extra address space via dma_vmap_noncontiguous(). Tianyu Lan (5): x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM dma-mapping: Add vmap/vunmap_noncontiguous() callback in dma ops hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM net: netvsc: Add Isolation VM support for netvsc driver scsi: storvsc: Add Isolation VM support for storvsc driver arch/x86/mm/mem_encrypt.c | 4 +- arch/x86/xen/pci-swiotlb-xen.c | 3 +- drivers/hv/Kconfig | 1 + drivers/hv/vmbus_drv.c | 6 + drivers/iommu/hyperv-iommu.c | 164 +++++++++++++++++++++++++ drivers/net/hyperv/hyperv_net.h | 5 + drivers/net/hyperv/netvsc.c | 192 +++++++++++++++++++++++++++--- drivers/net/hyperv/rndis_filter.c | 2 + drivers/scsi/storvsc_drv.c | 37 +++--- include/linux/dma-map-ops.h | 3 + include/linux/hyperv.h | 17 +++ include/linux/swiotlb.h | 6 + kernel/dma/mapping.c | 18 ++- kernel/dma/swiotlb.c | 75 ++++++++++-- 14 files changed, 488 insertions(+), 45 deletions(-) -- 2.25.1
