Hi. I'm using a dual Xeon system with Intel e810 25G network card and make use of SRIOV feature heavily. I have a script to setup the NIC the first step is echo $VFS > /sys/class/net/$DEVNAME/device/sriov_numvfs After switching from v6.1 to v6.2-rc1 "sriov_numvfs" is no longer present. If I switch back to v6.1 it's back. Command line parameters are the same so it's most likely kernel changes. I did git bisect and found the culprit to be 07eab0901ed(efi/x86: Remove EfiMemoryMappedIO from E820 map) I tested v6.2-rc3 and it's the same. I reverted this commit on top of v6.2-rc3 then sriov_numvfs is back again. Comparing the dmesg output, I found that with commit 07eab0901ed these lines are present: [ 0.000000] efi: Remove mem94: MMIO range=[0x80000000-0x8fffffff] (256MB) from e820 map [ 0.000000] e820: remove [mem 0x80000000-0x8fffffff] reserved [ 0.000000] efi: Remove mem95: MMIO range=[0xfd000000-0xfe7fffff] (24MB) from e820 map [ 0.000000] e820: remove [mem 0xfd000000-0xfe7fffff] reserved [ 0.000000] efi: Not removing mem96: MMIO range=[0xfed20000-0xfed44fff] (148KB) from e820 map [ 0.000000] efi: Remove mem97: MMIO range=[0xff000000-0xffffffff] (16MB) from e820 map [ 0.000000] e820: remove [mem 0xff000000-0xffffffff] reserved [ 0.000000] efi: Remove mem99: MMIO range=[0x1ffc00000000-0x1fffffffffff] (16384MB) from e820 map [ 0.000000] e820: remove [mem 0x1ffc00000000-0x1fffffffffff] reserved I think that's what the commit actually does. But the following are missing: [ 2.516119] pci 0000:ca:00.0: reg 0x184: [mem 0x208ffd000000-0x208ffd01ffff 64bit pref] [ 2.516121] pci 0000:ca:00.0: VF(n) BAR0 space: [mem 0x208ffd000000-0x208ffdffffff 64bit pref] (contains BAR0 for 128 VFs) [ 2.516134] pci 0000:ca:00.0: reg 0x190: [mem 0x208ffe220000-0x208ffe223fff 64bit pref] [ 2.516136] pci 0000:ca:00.0: VF(n) BAR3 space: [mem 0x208ffe220000-0x208ffe41ffff 64bit pref] (contains BAR3 for 128 VFs) Not sure whether this is a driver issue specific to Intel e810(module ice) or a more general one. Any thoughts on this issue? Best regards, Peifeng Qiu
