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Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap sup
From: |
Edgar E. Iglesias |
Subject: |
Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support |
Date: |
Thu, 23 Apr 2015 21:34:59 +1000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Apr 23, 2015 at 12:28:43PM +0100, Peter Maydell wrote:
> On 23 April 2015 at 12:24, Edgar E. Iglesias <address@hidden> wrote:
> > Maybe we can consider YIELD instead of NOP when has_work() is true as a WFI
> > is probably a good hint from guests to reschedule QEMU CPUs.
>
> That I'm not convinced about. If we have a pending interrupt then
> our best bet is probably to take it immediately on this CPU, not
> yield to another CPU and take the interrupt when we eventually
> get control back.
Yeah, true. It's actually a very bad YIELD point when has_work() is true
for a WFI.
For WFE too I guess, when interrupts are unmasked.
Good point.
Cheers,
Edgar
- Re: [Qemu-devel] [PATCH v2 6/9] target-arm: Add TTBR regime function and use, (continued)
- [Qemu-devel] [PATCH v2 5/9] target-arm: Extend FP checks to use an EL, Greg Bellows, 2015/04/22
- [Qemu-devel] [PATCH v2 7/9] target-arm: Add EL3 and EL2 TCR checking, Greg Bellows, 2015/04/22
- [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Greg Bellows, 2015/04/22
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Edgar E. Iglesias, 2015/04/22
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Edgar E. Iglesias, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Edgar E. Iglesias, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support,
Edgar E. Iglesias <=
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Greg Bellows, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Greg Bellows, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Greg Bellows, 2015/04/23
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, Peter Maydell, 2015/04/23
[Qemu-devel] [PATCH v2 8/9] target-arm: Add WFx syndrome function, Greg Bellows, 2015/04/22
Re: [Qemu-devel] [PATCH v2 0/9] target-arm: EL3 trap support, Edgar E. Iglesias, 2015/04/22