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Re: [patch] x86: kvm: Convert i8254/i8259 locks to raw_spinlocks

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From: Jan Kiszka
Subject: Re: [patch] x86: kvm: Convert i8254/i8259 locks to raw_spinlocks
Date: Tuesday, February 23, 2010 - 12:18 pm

Thomas Gleixner wrote:

Doesn't fly for -rt anymore: pic_irq_update runs under this raw lock and
calls kvm_vcpu_kick which tries to wake_up some thread -> scheduling
while atomic.

This used to work up to 956f97cf. -rt for 2.6.31 is not yet affected,
but 2.6.33 should be broken (haven't checked, using kvm-kmod over 2.6.31
ATM). I can provide a patch that restores the deferred kicking if it's
acceptable for upstream.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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Messages in current thread:
Re: [patch] x86: kvm: Convert i8254/i8259 locks to raw_spi ..., Jan Kiszka, (Tue Feb 23, 12:18 pm)
Re: [patch] x86: kvm: Convert i8254/i8259 locks to raw_spi ..., Thomas Gleixner, (Tue Feb 23, 3:23 pm)
[PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 2:41 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Avi Kivity, (Wed Feb 24, 2:48 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 2:54 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Avi Kivity, (Wed Feb 24, 3:04 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 3:13 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Avi Kivity, (Wed Feb 24, 3:17 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 3:22 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Avi Kivity, (Wed Feb 24, 3:27 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 3:28 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 3:31 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Avi Kivity, (Wed Feb 24, 3:41 am)
Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again, Jan Kiszka, (Wed Feb 24, 4:42 am)