Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Marc Zyngier
On 20/01/16 16:47, Andrew Jones wrote: > On Wed, Jan 20, 2016 at 04:20:03PM +, Marc Zyngier wrote: >> Just tried on Seattle with a 64bit guest, and there is hardly any >> difference indeed. Both host and guest are "mostly" defconfig as well. >> So there is a kernel configuration difference. >>

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Andrew Jones
On Wed, Jan 20, 2016 at 04:20:03PM +, Marc Zyngier wrote: > On 20/01/16 15:06, Andrew Jones wrote: > > On Wed, Jan 20, 2016 at 02:28:05PM +, Marc Zyngier wrote: > >> On 20/01/16 14:01, Andrew Jones wrote: > >>> On Tue, Jan 19, 2016 at 07:48:14PM +0100, Andrew Jones wrote: > On Tue, Jan

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Marc Zyngier
On 20/01/16 15:06, Andrew Jones wrote: > On Wed, Jan 20, 2016 at 02:28:05PM +, Marc Zyngier wrote: >> On 20/01/16 14:01, Andrew Jones wrote: >>> On Tue, Jan 19, 2016 at 07:48:14PM +0100, Andrew Jones wrote: On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: >>> On Tue, Jan 1

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Andrew Jones
On Wed, Jan 20, 2016 at 02:28:05PM +, Marc Zyngier wrote: > On 20/01/16 14:01, Andrew Jones wrote: > > On Tue, Jan 19, 2016 at 07:48:14PM +0100, Andrew Jones wrote: > >> On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: > > On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Marc Zyngier
On 20/01/16 14:01, Andrew Jones wrote: > On Tue, Jan 19, 2016 at 07:48:14PM +0100, Andrew Jones wrote: >> On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: > On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: OK, CCing him. One thing I see is that without this change

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-20 Thread Andrew Jones
On Tue, Jan 19, 2016 at 07:48:14PM +0100, Andrew Jones wrote: > On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: > > >> On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: > > > OK, CCing him. One thing I see is that without this change we're > > > currently setting the clock

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Andrew Jones
On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: > On 19/01/16 13:32, Andrew Jones wrote: > > On Tue, Jan 19, 2016 at 01:43:41PM +0100, Christoffer Dall wrote: > >> On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: > >>> On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Peter Maydell
On 19 January 2016 at 11:49, Christoffer Dall wrote: > The virt board has an arch timer, which is always on. Emit the > "always-on" property to indicate to Linux that it can switch off the > periodic timer and reduces the amount of interrupts injected into a > guest. > > Signed-off-by: Christoffe

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Andrew Jones
On Tue, Jan 19, 2016 at 01:43:07PM +, Marc Zyngier wrote: > On 19/01/16 13:32, Andrew Jones wrote: > > On Tue, Jan 19, 2016 at 01:43:41PM +0100, Christoffer Dall wrote: > >> On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: > >>> On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Marc Zyngier
On 19/01/16 13:32, Andrew Jones wrote: > On Tue, Jan 19, 2016 at 01:43:41PM +0100, Christoffer Dall wrote: >> On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: >>> On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer Dall wrote: The virt board has an arch timer, which is always on

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Andrew Jones
On Tue, Jan 19, 2016 at 01:43:41PM +0100, Christoffer Dall wrote: > On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: > > On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer Dall wrote: > > > The virt board has an arch timer, which is always on. Emit the > > > "always-on" property to

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Christoffer Dall
On Tue, Jan 19, 2016 at 01:37:16PM +0100, Andrew Jones wrote: > On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer Dall wrote: > > The virt board has an arch timer, which is always on. Emit the > > "always-on" property to indicate to Linux that it can switch off the > > periodic timer and reduc

Re: [Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Andrew Jones
On Tue, Jan 19, 2016 at 12:49:18PM +0100, Christoffer Dall wrote: > The virt board has an arch timer, which is always on. Emit the > "always-on" property to indicate to Linux that it can switch off the > periodic timer and reduces the amount of interrupts injected into a > guest. > > Signed-off-b

[Qemu-devel] [PATCH] hw/arm/virt: Add always-on property to the virt board timer

2016-01-19 Thread Christoffer Dall
The virt board has an arch timer, which is always on. Emit the "always-on" property to indicate to Linux that it can switch off the periodic timer and reduces the amount of interrupts injected into a guest. Signed-off-by: Christoffer Dall --- hw/arm/virt.c | 1 + 1 file changed, 1 insertion(+)