Re: bhyve regression (head): windows VMs failing with error 0xc000021a

On Fri, Oct 25, 2024 at 09:24:13PM +0200, Guido Falsi wrote:
> Hi,
> 
> I've recently updated my current machines to git commit
> 525a177c165740fc697df3de5b92e58b3b41477c (Sun Oct 20 22:43:41 2024 -0800)
> and just have Windows 10 VMs fail to start in bhyve with the error in the
> subject.
> 
> I've been unable to recover them with usual tricks (automatic recovery,
> chkdsk, and other tools provided by the OS). Looks like the machine fails to
> read C: after boot.
> 
> These machines were working fine before the update, so my suspect is that
> some recent change in bhyve is causing the issue and the VMs would be
> otherwise fine.
> 
> The VMs have their filesystems in compressed zvols.
> 
> Anyone has an idea or can point to some change I can test reverting?

Just a guess, but you might try adding "-o pci.enable_bars=true" to the
bhyve command line arguments

> I an also try bisecting, I'd guess the issue is quite recent.

Which revision did you update from?

> Thanks in advance for any advice.
> 
> Obviously if any further info is needed just ask.

What command line arguments are passed to bhyve?  What boot firmware are
you using?