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Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap sup
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support |
Date: |
Thu, 23 Apr 2015 15:51:48 +0100 |
On 23 April 2015 at 15:41, Greg Bellows <address@hidden> wrote:
> Ok it sounds like the primary concern is the performance impact of
> constantly trapping wfe to EL2 (in which case HCR must be set to cause
> this). Should we still honor EL3 and EL1 trapping ofr wfe? In other words
> check if they are the target and allow it if !has_work?
We should check what the architecture manual says, but I think
that in all the trap-WFE cases it says "traps if the CPU
would go into a low power state". QEMU *never* goes into a
low power state on WFE, so we never trap.
-- PMM
- Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support, (continued)
- 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, 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 <=
- 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