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| author | John Levon <john.levon@nutanix.com> | 2021-03-22 16:53:15 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-03-22 16:53:15 +0000 |
| commit | 3c33c863a178dbb656c835a000df0defdbaa1a9d (patch) | |
| tree | 4992aa5da29325bb43f7854a9a75870513566d5f /README.md | |
| parent | 052d709d0cfd77c36f5b31402c3cc1c3d868d618 (diff) | |
| download | libvfio-user-3c33c863a178dbb656c835a000df0defdbaa1a9d.zip libvfio-user-3c33c863a178dbb656c835a000df0defdbaa1a9d.tar.gz libvfio-user-3c33c863a178dbb656c835a000df0defdbaa1a9d.tar.bz2 | |
README: fix qemu cmdline (#398)
For the GPIO demo, we were asking qemu to create a file-backed hostmem backend,
but neglecting to actually allocate guest RAM from it.
While we're here, let's give some clues on how to use hugepages and share memory
with libvfio-user.
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 13 |
1 files changed, 7 insertions, 6 deletions
@@ -179,12 +179,13 @@ to build the `gpio-pci-idio-16` kernel module yourself - it's part of the standard Linux kernel, but not usually built and shipped on x86. Start your guest VM: - ./x86_64-softmmu/qemu-system-x86_64 -mem-prealloc -m 1024 \ - -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=mem,share=yes,size=1073741824 \ - -kernel ~/vmlinuz -initrd ~/initrd -nographic \ - -append "console=ttyS0 root=/dev/sda1 single" \ - -hda ~/bionic-server-cloudimg-amd64-0.raw \ - -device vfio-user-pci,socket=/tmp/vfio-user.sock + ./x86_64-softmmu/qemu-system-x86_64 -mem-prealloc -m 256 \ + -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/gpio,share=yes,size=256M \ + -numa node,memdev=ram-node0 \ + -kernel ~/vmlinuz -initrd ~/initrd -nographic \ + -append "console=ttyS0 root=/dev/sda1 single" \ + -hda ~/bionic-server-cloudimg-amd64-0.raw \ + -device vfio-user-pci,socket=/tmp/vfio-user.sock Log in to your guest VM, and you should be able to load the module and observe the emulated GPIO device's pins: |