From: "leohou@tom.com" <leohou@tom.com>
To: virtualization <virtualization@lists.linux-foundation.org>,
iommu <iommu@lists.linux.dev>, qemu-arm <qemu-arm@nongnu.org>,
jasowang <jasowang@redhat.com>
Cc: leohou1402 <leohou1402@gmail.com>
Subject: vIOMMU&IOMMU gIOVA to HPA mapping
Date: Mon, 14 Nov 2022 20:31:49 +0800 [thread overview]
Message-ID: <2022111420314945171759@tom.com> (raw)
Hi，
Here is my application scenario：
1. The NIC (Network Information Center) passes through to the VM(Virtual Machine);
2. The VM uses the user mode driver DPDK;
Question:
1. vIOMMU maintains the mapping gIOVA->gPA, When do you use this gPA ?
2. Physical IOMMU maintains the GIOVA->HPA mapping ? If so, by what means (gIOVA -> HPA) mapping ?
3. What does QEMU do in NIC pass-through address translation ？
---------------------------------------------------------------------------------------------------------------------
_____________________________________________________________________________
| ___________________________________________________________ |
| | _____________________________________________________ | |
| | | | | |
| | | __________________________________ | | |
| | | | ______ | | | | ______
| | | User | | Mem |-----------------------|----|-|----|-----> | |
| | | | |______| DPDK | | | | (gVA) |______|
| | | | (gVA) | | | | | |
| | | |______|___________________________| | | | | |
| | |--GuestOS----------|--------------------------------| | | | |
| | | ______\/__________________________ | | | | |
| | VM | | VFIO | | | | | |
| User | | Kernel |___________ __________________| | | | | |
| | | | vfio-pci | | | | | | | |
| | | | (gIOVA) | | vfio_iommu_type2 | | | | | |
Software | | | |______|____|___|__________________| | | | | |
| | |___________________|________________________________| | | | |
| | ____________________________________________________ | | | |
| | | ______|____ __________________ | | | \/ \/
| | | | \/ | | | | | | ______
| | | | NIC | | vIOMMU | | | | | |
| | | QEMU | Instance | | --|----|-|----|-----> |______|
| | | | (gIOVA) | | (GIOVA-->GPA) | | | | (gPA) | |
| | | |_____|_____| |__________________| | | | | |
| | |__________________|_________________________________| | | | |
| |_______________________|___________________________________| | | |
|---HostOS---------------------------|----------------------------------------| | |
| ___________________________________________________________ | | |
| | | | | | |
| | | VFIO | | | |
| Kernel |_______________________|_____ _________________________| | | |
| | \/ | | | | | |
| | vfio-pci | | vfio_iommu_type1 | | | |
| | | | | | | | |
| |_______________________|_____|___|_________________________| | | |
|____________________________________|________________________________________| | |
-----------------------------------------------|-------------------------------------------------|----|--------------
____________________________________\/____ _________________________ ___\/___\/___________
| | | | | | | | |
Hardware | NIC | DMA (gIOVA) --|---|-> IOMMU --|---------|->|______| |
| |_____________________________| | (gIOVA-->HPA) | (HPA) | Physical Memory |
|__________________________________________| |_________________________| |_____________________|
---------------------------------------------------------------------------------------------------------------------
leohou@tom.com
next reply other threads:[~2022-11-14 12:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-14 12:31 leohou [this message]
2022-11-14 16:18 ` vIOMMU&IOMMU gIOVA to HPA mapping Alex Williamson
2022-11-14 16:18 ` Alex Williamson
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