On Mär 18 2025, Helge Deller wrote:
> My current (unreliable) way to detect it is using uname.
> The kernel string and arch name don't match:
>
> (sid_hppa)root@paq:/# uname -a
> Linux paq 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07)
> parisc GNU/Linux
>
> (sid_hppa)root@pa
On Tue, Mar 18, 2025 at 01:06:17PM +, Peter Maydell wrote:
> On Tue, 18 Mar 2025 at 12:43, Daniel P. Berrangé wrote:
> >
> > On Tue, Mar 18, 2025 at 01:34:57PM +0100, Andreas Schwab wrote:
> > > On Mär 18 2025, Daniel P. Berrangé wrote:
> > >
> > > > Whereever practical, it is preferrable to c
On Mär 18 2025, Daniel P. Berrangé wrote:
> Whereever practical, it is preferrable to check a discrete feature
> or behaviour in a functional way, rather than matching on "is it QEMU"
Do you know a way to detect support for CLONE_VFORK that isn't too
expensive?
--
Andreas Schwab, SUSE Labs, sch
On 3/18/25 11:18, Andreas Schwab wrote:
Is there a generic way for a program to detect that is it being run
inside the linux-user emulation?
Yes, having a reliable way to detect it would be good.
My current (unreliable) way to detect it is using uname.
The kernel string and arch name don't mat
On Tue, 18 Mar 2025 at 13:55, Daniel P. Berrangé wrote:
>
> On Tue, Mar 18, 2025 at 01:06:17PM +, Peter Maydell wrote:
> > The difficulty with vfork() (and, more generally, with various of
> > the clone() syscall flag combinations) is that because we use the
> > host libc we are restricted to
On Tue, Mar 18, 2025 at 01:34:57PM +0100, Andreas Schwab wrote:
> On Mär 18 2025, Daniel P. Berrangé wrote:
>
> > Whereever practical, it is preferrable to check a discrete feature
> > or behaviour in a functional way, rather than matching on "is it QEMU"
>
> Do you know a way to detect support f
On Tue, 18 Mar 2025 at 10:36, Helge Deller wrote:
>
> On 3/18/25 11:18, Andreas Schwab wrote:
> > Is there a generic way for a program to detect that is it being run
> > inside the linux-user emulation?
>
> Yes, having a reliable way to detect it would be good.
>
> My current (unreliable) way to d
On Tue, 18 Mar 2025 at 15:04, Peter Maydell wrote:
> More generally, AIUI glibc expects that it has control over what's
> happening with threads, so it can set up its own data structures
> for the new thread (e.g. for TLS variables). This email from the
> glibc mailing list is admittedly now two d
On Tue, 18 Mar 2025 at 17:18, Daniel P. Berrangé wrote:
>
> On Tue, Mar 18, 2025 at 05:08:52PM +, Peter Maydell wrote:
> > On Tue, 18 Mar 2025 at 15:04, Peter Maydell
> > wrote:
> > > More generally, AIUI glibc expects that it has control over what's
> > > happening with threads, so it can s
On Tue, Mar 18, 2025 at 03:17:33PM +0100, Andreas Schwab wrote:
> On Mär 18 2025, Daniel P. Berrangé wrote:
>
> > That would get the synchronization behaviour of Linux vfork,
> > but I'm not sure it'd get the performance benefits (of avoiding
> > page table copying) which is what Andreas mentione
On Tue, Mar 18, 2025 at 05:08:52PM +, Peter Maydell wrote:
> On Tue, 18 Mar 2025 at 15:04, Peter Maydell wrote:
> > More generally, AIUI glibc expects that it has control over what's
> > happening with threads, so it can set up its own data structures
> > for the new thread (e.g. for TLS varia
On Tue, 18 Mar 2025 at 12:43, Daniel P. Berrangé wrote:
>
> On Tue, Mar 18, 2025 at 01:34:57PM +0100, Andreas Schwab wrote:
> > On Mär 18 2025, Daniel P. Berrangé wrote:
> >
> > > Whereever practical, it is preferrable to check a discrete feature
> > > or behaviour in a functional way, rather than
On Mär 18 2025, Daniel P. Berrangé wrote:
> That would get the synchronization behaviour of Linux vfork,
> but I'm not sure it'd get the performance benefits (of avoiding
> page table copying) which is what Andreas mentioned as the
> desired thing ?
For an emulation performance isn't a thing, wh
On Tue, Mar 18, 2025 at 10:53:27AM +, Peter Maydell wrote:
> On Tue, 18 Mar 2025 at 10:36, Helge Deller wrote:
> >
> > On 3/18/25 11:18, Andreas Schwab wrote:
> > > Is there a generic way for a program to detect that is it being run
> > > inside the linux-user emulation?
> >
> > Yes, having a
On 3/18/25 11:36, Helge Deller wrote:
On 3/18/25 11:18, Andreas Schwab wrote:
Is there a generic way for a program to detect that is it being run
inside the linux-user emulation?
Yes, having a reliable way to detect it would be good.
In qemu-user emulation we could change the return values o
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