On Tue, Jun 10, 2025 at 05:45:52PM +0200, Jan Beulich wrote:
> On 05.06.2025 18:16, Roger Pau Monne wrote:
> > @@ -271,6 +279,43 @@ void pci_setup(void)
> > if ( bar_sz == 0 )
> > continue;
> >
> > +if ( !xenpci_bar_uc &&
> > + ((bar_data
On 05.06.2025 18:16, Roger Pau Monne wrote:
> @@ -271,6 +279,43 @@ void pci_setup(void)
> if ( bar_sz == 0 )
> continue;
>
> +if ( !xenpci_bar_uc &&
> + ((bar_data & PCI_BASE_ADDRESS_SPACE) ==
> + PCI_BASE_ADDRESS_SPACE_M
On 6/6/25 3:41 PM, Roger Pau Monné wrote:
On Thu, Jun 05, 2025 at 06:16:59PM +0200, Roger Pau Monne wrote:
The Xen PCI device (vendor ID 0x5853) exposed to x86 HVM guests doesn't
have the functionality of a traditional PCI device. The exposed MMIO BAR
is used by some guests (including Linux) a
On Fri, Jun 06, 2025 at 01:00:19PM +, Tu Dinh wrote:
> Hi Roger,
>
> On 05/06/2025 18:20, Roger Pau Monne wrote:
> > The Xen PCI device (vendor ID 0x5853) exposed to x86 HVM guests doesn't
> > have the functionality of a traditional PCI device. The exposed MMIO BAR
> > is used by some guests
On Thu, Jun 05, 2025 at 06:16:59PM +0200, Roger Pau Monne wrote:
> The Xen PCI device (vendor ID 0x5853) exposed to x86 HVM guests doesn't
> have the functionality of a traditional PCI device. The exposed MMIO BAR
> is used by some guests (including Linux) as a safe place to map foreign
> memory,
On 06/06/2025 15:23, Roger Pau Monné wrote:
[...]
>>
>> Since this is meant to be a workaround, I wonder if it makes more sense
>> to flip the setting (`xenpci_bar_wb`) and make it 0 by default?
>
> I originally didn't want to go that route, because while it's true
> that the default MTRR type is s
Hi Roger,
On 05/06/2025 18:20, Roger Pau Monne wrote:
> The Xen PCI device (vendor ID 0x5853) exposed to x86 HVM guests doesn't
> have the functionality of a traditional PCI device. The exposed MMIO BAR
> is used by some guests (including Linux) as a safe place to map foreign
> memory, including
The Xen PCI device (vendor ID 0x5853) exposed to x86 HVM guests doesn't
have the functionality of a traditional PCI device. The exposed MMIO BAR
is used by some guests (including Linux) as a safe place to map foreign
memory, including the grant table itself.
Traditionally BARs from devices have t
