Intel IGD passthrough working intermittently

2024-10-02 Thread Marco
First of all, I'm not really sure where the problem might be, whether libvirt itself, qemu or some other component; so I'm writing here to begin the discussion, but please direct me to a more appropriate place if needed. I have a machine with an integrated Intel GPU: 00:02.0 VGA compatible contro

Re: Intel IGD passthrough working intermittently

2024-10-02 Thread Marco
On Wed, Oct 2, 2024 at 2:30 PM Corvin Köhne wrote: > > First of all, you should make sure to pass the correct gms value to the > guest. I've already seen issues when passing the wrong value to guests. > That's why I've recently send a patch to qemu to always reuse the host > value [1]. Ok thanks,

Re: Intel IGD passthrough working intermittently

2024-10-02 Thread Corvin Köhne
On Wed, 2024-10-02 at 14:59 +0200, Marco wrote: > CAUTION: External Email!! > On Wed, Oct 2, 2024 at 2:30 PM Corvin Köhne > wrote: > > > > First of all, you should make sure to pass the correct gms value to > > the > > guest. I've already seen issues when passing the wrong value to > > guests. >

Re: Intel IGD passthrough working intermittently

2024-10-02 Thread Marco
On Wed, Oct 2, 2024 at 3:39 PM Corvin Köhne wrote: > > > Ok thanks, I seem to understand I should use the same value that the > > host uses, but how do I figure out that value? > > > > It's contained in bits 15:8 of PCI register 0x50. So, just take a look > into lspci -xxx. I'm not really familia

Re: Intel IGD passthrough working intermittently

2024-10-02 Thread Corvin Köhne
On Wed, 2024-10-02 at 13:05 +0200, Marco wrote: > CAUTION: External Email!! > First of all, I'm not really sure where the problem might be, whether > libvirt itself, qemu or some other component; so I'm writing here to > begin the discussion, but please direct me to a more appropriate place > if ne