On Tue, 24 Sep 2019 16:10:07 +0900, Sahibzada Irfanullah said: > subject line. The problem is: I am trying to write/read page faulted > physical addresses to a file in a kernel (v5.3-1) function, i.e., > handle_ept_violation() which is present in vmx.c. I have followed this > <https://stackoverflow.com/questions/1184274/read-write-files-within-a-linux-kernel-module>, Just because somebody on stackoverflow gave a guide doesn't mean it's a good idea. What problem are you trying to solve here? Are you trying to write the faulted pages themselves to a file? In that case, just creating the file, using something like 'dd if=/dev/zero of=/your/file/here bs=1M count=4096' and then using mkswap and swapon will probably work much better. If you're trying to produce a trace of what pages are being faulted, you can probably do a better job by using 'perf' to produce trace events with a lot of added data for you, or use debugfs or netlink and a userspace program to read the data and write it to disk from userspace.
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