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Re: [Qemu-devel] [PATCH v2 2/4] RTC:Add RTC update-ended interrupt logic
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH v2 2/4] RTC:Add RTC update-ended interrupt logic |
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Date: |
Mon, 20 Feb 2012 08:38:20 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1 |
On 02/20/2012 01:25 AM, Zhang, Yang Z wrote:
> Use timer to emulate RTC update-ended interrupt. The timer is enabled
> only when UIE is setting.
The timer needs to be enabled when UF is clear, not when UIE is set. If
UIE is set but the update interrupt is masked you do not need to do
anything; on the other hand you need to update UF in case the guest is
observing interrupts with polling.
Paolo