是 B550 芯片组不支持还是 Ryzen G 系列不支持 acs

肯定都是支持的，我是 5700x + b550 重炮手，芯片组出来的那个 x16 的插槽插了张 dg1 显卡，直通给虚拟转码用完全没问题

B550 不支持

Gagabyte 是啥？➡️ Gigabyte

我的是华硕 TUF B550M ，PVE 8.0 ，默认内核，没打 acs 补丁
B550 对 ACS 的支持不完善，有些 PCIe 是拆不开的，需要覆盖两个选项，增加拆分粒度
在 GRUB_CMDLINE_LINUX_DEFAULT 中添加 pcie_acs_override=downstream,multifunction

downstream
作用于 PCIe 总线的下游设备。
当启用此选项时，内核会强制认为在 PCIe 交换机的下游所有端口都启用了 ACS 分离，从而尝试将下游设备分成更多的小组。下游包括主板连接的所有设备，比如 GPU 、NVMe SSD 等。

multifunction
作用于多功能设备（ Multi-Function Devices ）。
假设一个 PCIe 卡槽上的设备同时有多个功能（如多核显卡、网卡额外的管理端口），按照默认行为可能被分配到同一个 IOMMU Group 。这个选项允许内核将这些功能模块以更细的粒度划分为单独的组。

通过组合这两个选项，pcie_acs_override=downstream,multifunction 旨在尽可能地将 PCIe 设备划分成独立的 IOMMU Group ，增加虚拟化或硬件直通的灵活性。

@wniming 直通显卡没问题啊，我 pcie 拆分成 8x/8x 直通进去的，因为 pcie 显卡单独一个 iommu 组，但板载那些网卡不是。

@Unboundwill pcie_acs_override=downstream,multifunction 试过了，我是最新的 PVE 8.3 ，grub 设置了跟没设置一样

@Vtoecha 注意我说的是 “芯片组出来的那个 x16 的插槽”，这个如果不使用 acs 会和网卡那些分到同一个 iommu 组的，我把我的 iommu 分组情况给你参考一下：


d@server:~$ sudo dmidecode -t 2
# dmidecode 3.5
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: TUF GAMING B550M-PLUS (WI-FI)
Version: Rev X.0x
Serial Number: 210585824000952
Asset Tag: Default string
Features:
Board is a hosting board
Board is replaceable
Location In Chassis: Default string
Chassis Handle: 0x0003
Type: Motherboard
Contained Object Handles: 0

d@server:~$
d@server:~$ iommu
IOMMU Group 0:
00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 1:
00:01.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge [1022:1483]
IOMMU Group 2:
00:01.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge [1022:1483]
IOMMU Group 3:
00:02.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 4:
00:03.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 5:
00:03.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge [1022:1483]
IOMMU Group 6:
00:04.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 7:
00:05.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 8:
00:07.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 9:
00:07.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1022:1484]
IOMMU Group 10:
00:08.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 11:
00:08.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1022:1484]
IOMMU Group 12:
00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller [1022:790b] (rev 61)
00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge [1022:790e] (rev 51)
IOMMU Group 13:
00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 0 [1022:1440]
00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 1 [1022:1441]
00:18.2 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 2 [1022:1442]
00:18.3 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 3 [1022:1443]
00:18.4 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 4 [1022:1444]
00:18.5 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 5 [1022:1445]
00:18.6 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 6 [1022:1446]
00:18.7 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse/Vermeer Data Fabric: Device 18h; Function 7 [1022:1447]
IOMMU Group 14:
01:00.0 Non-Volatile memory controller [0108]: Sandisk Corp WD Blue SN570 NVMe SSD 2TB [15b7:5025] (rev 01)
IOMMU Group 15:
02:00.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset USB 3.1 XHCI Controller [1022:43ee]
IOMMU Group 16:
02:00.1 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset SATA Controller [1022:43eb]
IOMMU Group 17:
02:00.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset Switch Upstream Port [1022:43e9]
IOMMU Group 18:
03:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
IOMMU Group 19:
03:02.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
IOMMU Group 20:
03:03.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
IOMMU Group 21:
03:08.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
IOMMU Group 22:
03:09.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
IOMMU Group 23:
04:00.0 PCI bridge [0604]: Intel Corporation Device [8086:4910]
IOMMU Group 24:
05:01.0 PCI bridge [0604]: Intel Corporation Device [8086:490f]
IOMMU Group 25:
05:04.0 PCI bridge [0604]: Intel Corporation Device [8086:490f]
IOMMU Group 26:
05:05.0 PCI bridge [0604]: Intel Corporation Device [8086:490f]
IOMMU Group 27:
06:00.0 VGA compatible controller [0300]: Intel Corporation DG1 [Iris Xe Graphics] [8086:4908] (rev 01)
IOMMU Group 28:
07:00.0 Audio device [0403]: Intel Corporation Device [8086:490d]
IOMMU Group 29:
08:00.0 Memory controller [0580]: Intel Corporation Device [8086:490e]
IOMMU Group 30:
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8161] (rev 15)
IOMMU Group 31:
0b:00.0 Network controller [0280]: Intel Corporation Wi-Fi 6 AX200 [8086:2723] (rev 1a)
IOMMU Group 32:
0c:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125] (rev 04)
IOMMU Group 33:
0d:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] [1002:699f] (rev c7)
IOMMU Group 34:
0d:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X] [1002:aae0]
IOMMU Group 35:
0e:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function [1022:148a]
IOMMU Group 36:
0f:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Reserved SPP [1022:1485]
IOMMU Group 37:
0f:00.1 Encryption controller [1080]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Cryptographic Coprocessor PSPCPP [1022:1486]
IOMMU Group 38:
0f:00.3 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Matisse USB 3.0 Host Controller [1022:149c]
IOMMU Group 39:
0f:00.4 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller [1022:1487]
d@server:~$
d@server:~$