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Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of in
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop |
Date: |
Sun, 24 Jun 2012 16:08:04 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-06-24 10:49, Avi Kivity wrote:
> On 06/23/2012 02:45 PM, Jan Kiszka wrote:
>>
>> Hmm, we may need the iothread lock around cpu_set_apic_tpr for
>> !kvm_irqchip_in_kernel(). And as we are at it, apic_base manipulation
>> can be but there as well.
>>
>> With in-kernel irqchip, there is no such need. Also, no one accesses
>> eflags outside of the vcpu thread, independent of the irqchip mode.
>
> In fact !kvm_irqchip_in_kernel() is broken wrt the tpr. Interrupt
> injection needs to be done atomically, but currently we check the tpr
> from the injecting thread, which means the cpu thread can race with it.
> We need to move the check to the vcpu thread so that the guest vcpu is
> halted.
So apic_set_irq basically needs to be deferred to vcpu context, right?
Will have a look.
Jan
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- [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/22
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/22
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Marcelo Tosatti, 2012/06/22
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/23
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Marcelo Tosatti, 2012/06/23
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/23
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, liu ping fan, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Jan Kiszka, 2012/06/24
- Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop, Avi Kivity, 2012/06/24