Re: [RFC PATCH-for-7.0 v4 0/2] cocoa: run qemu_init in the main thread

[Philippe Mathieu-Daudé]

Hi Akihiko, Paolo, Peter.

On 17/3/22 13:55, Philippe Mathieu-Daudé wrote:
> From: Philippe Mathieu-Daudé <f4bug@amsat.org>
>
> Posting v4 in case someone want to iterate.
>
> Pending issue raised by Akihiko Odaki:
>
> * this actually breaks the "runas" option with ui/cocoa.
>
>    [+NSApplication sharedApplication] calls issetugid() to see if
>    setgid() or setuid() is called before and calls exit() if it evaluates
>    true. It does not evaluate true without this patch since setgid() and
>    setuid() are called after [+NSApplication sharedApplication]. This
>    patch, however, changes the order and triggers the check.
>
>    There are two options to solve the problem:
>    1. Move setgid and setuid calls after [+NSApplication
>    sharedApplication] to let NSApplication initialize as the original
>    user.

Akihiko, could you send a patch?

>    2. Do: [[NSUserDefaults standardUserDefaults] setBool:YES
>    forKey:@"_NSAppAllowsNonTrustedUGID"]
>
>    Option 2 would be preferred in terms of practicality since nobody
>    would want to initialize NSApplication as the original user (usually
>    superuser). However, _NSAppAllowsNonTrustedUGID is not documented by
>    Apple.

What are your views on this problem for 7.0-rc1? Keep modifying cocoa
UI? Disable block layer assertions? Only disable them for Darwin?

> * Oudated comment in main():
>
>   1970  /*
>   1971   * Create the menu entries which depend on QEMU state (for consoles
>   1972   * and removeable devices). These make calls back into QEMU functions,
>   1973   * which is OK because at this point we know that the second thread
>   1974   * holds the iothread lock and is synchronously waiting for us to
>   1975   * finish.
>   1976   */
>
> (https://marc.info/?l=qemu-devel&m=164752136410805)
>
> Since v3:
> - Move qemu_event_init before cbowner alloc
> - Reduce main_thread scope to applicationDidFinishLaunching
> - Updated updateUIInfo() comment
>    (s/cocoa_display_init/applicationDidFinishLaunching)
>
> Since v2:
> - Extracted code movement in preliminary patch
>
> v3: 
> 20220317115644.37276-1-philippe.mathieu.daude@gmail.com/">https://lore.kernel.org/qemu-devel/20220317115644.37276-1-philippe.mathieu.daude@gmail.com/
> v2: 
> 20220316160300.85438-1-philippe.mathieu.daude@gmail.com/">https://lore.kernel.org/qemu-devel/20220316160300.85438-1-philippe.mathieu.daude@gmail.com/
> v1: 
> 20220307151004.578069-1-pbonzini@redhat.com/">https://lore.kernel.org/qemu-devel/20220307151004.578069-1-pbonzini@redhat.com/
>
> Paolo Bonzini (1):
>    ui/cocoa: run qemu_init in the main thread
>
> Philippe Mathieu-Daudé (1):
>    ui/cocoa: Code movement
>
>   softmmu/main.c |  12 ++--
>   ui/cocoa.m     | 161 ++++++++++++++++++++++---------------------------
>   2 files changed, 79 insertions(+), 94 deletions(-)