Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-11 Thread Leon Romanovsky
On Tue, Jan 12, 2021 at 06:59:35AM +, Tian, Kevin wrote: > > From: Leon Romanovsky > > Sent: Tuesday, January 12, 2021 1:53 PM > > > > On Tue, Jan 12, 2021 at 01:17:11PM +0800, Lu Baolu wrote: > > > Hi, > > > > > > On 1/7/21 3:16 PM, Leon Romanovsky wrote: > > > > On Thu, Jan 07, 2021 at 06:55

RE: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-11 Thread Tian, Kevin
> From: Leon Romanovsky > Sent: Tuesday, January 12, 2021 1:53 PM > > On Tue, Jan 12, 2021 at 01:17:11PM +0800, Lu Baolu wrote: > > Hi, > > > > On 1/7/21 3:16 PM, Leon Romanovsky wrote: > > > On Thu, Jan 07, 2021 at 06:55:16AM +, Tian, Kevin wrote: > > > > > From: Leon Romanovsky > > > > > S

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-11 Thread Leon Romanovsky
On Tue, Jan 12, 2021 at 01:17:11PM +0800, Lu Baolu wrote: > Hi, > > On 1/7/21 3:16 PM, Leon Romanovsky wrote: > > On Thu, Jan 07, 2021 at 06:55:16AM +, Tian, Kevin wrote: > > > > From: Leon Romanovsky > > > > Sent: Thursday, January 7, 2021 2:09 PM > > > > > > > > On Thu, Jan 07, 2021 at 02:04

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-11 Thread Lu Baolu
Hi, On 1/7/21 3:16 PM, Leon Romanovsky wrote: On Thu, Jan 07, 2021 at 06:55:16AM +, Tian, Kevin wrote: From: Leon Romanovsky Sent: Thursday, January 7, 2021 2:09 PM On Thu, Jan 07, 2021 at 02:04:29AM +, Tian, Kevin wrote: From: Leon Romanovsky Sent: Thursday, January 7, 2021 12:02 A

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Leon Romanovsky
On Thu, Jan 07, 2021 at 06:55:16AM +, Tian, Kevin wrote: > > From: Leon Romanovsky > > Sent: Thursday, January 7, 2021 2:09 PM > > > > On Thu, Jan 07, 2021 at 02:04:29AM +, Tian, Kevin wrote: > > > > From: Leon Romanovsky > > > > Sent: Thursday, January 7, 2021 12:02 AM > > > > > > > > On

RE: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Tian, Kevin
> From: Leon Romanovsky > Sent: Thursday, January 7, 2021 2:09 PM > > On Thu, Jan 07, 2021 at 02:04:29AM +, Tian, Kevin wrote: > > > From: Leon Romanovsky > > > Sent: Thursday, January 7, 2021 12:02 AM > > > > > > On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote: > > > > On We

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Leon Romanovsky
On Thu, Jan 07, 2021 at 02:04:29AM +, Tian, Kevin wrote: > > From: Leon Romanovsky > > Sent: Thursday, January 7, 2021 12:02 AM > > > > On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote: > > > On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: > > > > > > > I asked

RE: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Tian, Kevin
> From: Leon Romanovsky > Sent: Thursday, January 7, 2021 12:02 AM > > On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote: > > On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: > > > > > I asked what will you do when QEMU will gain needed functionality? > > > Will you

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Lu Baolu
On 1/7/21 12:01 AM, Leon Romanovsky wrote: On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote: On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: I asked what will you do when QEMU will gain needed functionality? Will you remove QEMU from this list? If yes, how such

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Leon Romanovsky
On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote: > On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: > > > I asked what will you do when QEMU will gain needed functionality? > > Will you remove QEMU from this list? If yes, how such "new" kernel will > > work on old QE

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Jason Gunthorpe
On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote: > I asked what will you do when QEMU will gain needed functionality? > Will you remove QEMU from this list? If yes, how such "new" kernel will > work on old QEMU versions? The needed functionality is some VMM hypercall, so presumabl

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Leon Romanovsky
On Wed, Jan 06, 2021 at 06:10:09PM +0800, Lu Baolu wrote: > Hi Leon, > > On 2021/1/6 14:06, Leon Romanovsky wrote: > > On Wed, Jan 06, 2021 at 10:27:49AM +0800, Lu Baolu wrote: > > > The pci_subdevice_msi_create_irq_domain() should fail if the underlying > > > platform is not able to support IMS (I

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-06 Thread Lu Baolu
Hi Leon, On 2021/1/6 14:06, Leon Romanovsky wrote: On Wed, Jan 06, 2021 at 10:27:49AM +0800, Lu Baolu wrote: The pci_subdevice_msi_create_irq_domain() should fail if the underlying platform is not able to support IMS (Interrupt Message Storage). Otherwise, the isolation of interrupt is not guar

Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

2021-01-05 Thread Leon Romanovsky
On Wed, Jan 06, 2021 at 10:27:49AM +0800, Lu Baolu wrote: > The pci_subdevice_msi_create_irq_domain() should fail if the underlying > platform is not able to support IMS (Interrupt Message Storage). Otherwise, > the isolation of interrupt is not guaranteed. > > For x86, IMS is only supported on bar