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| author | Thanos Makatos <thanos.makatos@nutanix.com> | 2022-07-04 12:16:08 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-07-04 12:16:08 +0100 |
| commit | 36beb63be45ad1412562a98d9373a4c0bd91ab3d (patch) | |
| tree | 61bb44f0befc0055292b120909251c0fc2d27b0e /meson.build | |
| parent | 1c274027bb4f9d68eee846036e8d50dcde2fd7e9 (diff) | |
| download | libvfio-user-36beb63be45ad1412562a98d9373a4c0bd91ab3d.zip libvfio-user-36beb63be45ad1412562a98d9373a4c0bd91ab3d.tar.gz libvfio-user-36beb63be45ad1412562a98d9373a4c0bd91ab3d.tar.bz2 | |
support for shadow ioeventfd (#698)
When an ioeventfd is written to, KVM discards the value since it has no
memory to write it to, and simply kicks the eventfd. This a problem for
devices such a NVMe controllers that need the value (e.g. doorbells on
BAR0). This patch allows the vfio-user server to pass a file descriptor
that can be mmap'ed and KVM can write the ioeventfd value to this
_shadow_ memory instead of discarding it. This shadow memory is not
exposed to the guest.
Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Change-Id: Iad849c94076ffa5988e034c8bf7ec312d01f095f
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/meson.build b/meson.build index 03e9267..dba2ba6 100644 --- a/meson.build +++ b/meson.build @@ -18,6 +18,7 @@ opt_tran_pipe = get_option('tran-pipe') opt_debug_logs = get_option('debug-logs') opt_sanitizers = get_option('b_sanitize') opt_debug = get_option('debug') +opt_shadow_ioeventfd = get_option('shadow-ioeventfd') cc = meson.get_compiler('c') @@ -57,6 +58,10 @@ if opt_debug_logs.enabled() or (not opt_debug_logs.disabled() and opt_debug) common_cflags += ['-DDEBUG'] endif +if opt_shadow_ioeventfd + common_cflags += ['-DSHADOW_IOEVENTFD'] +endif + if get_option('warning_level') == '2' # -Wall is set for 'warning_level>=1' # -Wextra is set for 'warning_level>=2' |