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/xen-4.10.0-shim-comet/xen/drivers/passthrough/amd/
A Diommu_guest.c777 uint64_t reg_old, mmio; in guest_iommu_mmio_write() local
798 reg_old = iommu_mmio_read64(iommu, mmio); in guest_iommu_mmio_write()
799 reg_old &= ~(mask << shift); in guest_iommu_mmio_write()
800 val = reg_old | ((val & mask) << shift); in guest_iommu_mmio_write()

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