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Re: [Qemu-devel] [mttcg] cputlb: Use async tlb_flush_by_mmuidx
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [mttcg] cputlb: Use async tlb_flush_by_mmuidx |
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Date: |
Mon, 29 Feb 2016 14:50:04 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
On 29/02/2016 14:21, Peter Maydell wrote:
> On 29 February 2016 at 13:16, Alvise Rigo <address@hidden> wrote:
>> > As in the case of tlb_flush(), also tlb_flush_by_mmuidx has to query the
>> > TLB flush if it targets another VCPU. To accomplish this, a new async
>> > work has been added, together with a new TLBFlushByMMUIdxParams. A
>> > bitmap is used to track the MMU indexes to flush.
>> >
>> > This patch applies to the multi_tcg_v8 branch.
> What's the API for a target CPU emulation to say "and now I must
> wait for the TLB op to finish" before completing this guest
> instruction?
My proposal has been for a while for DMB to put the CPU in a halted
state (remote TLB callbacks then can decrement a counter and signal
cpu_halt_cond when it's zero), but no one has implemented this.
Paolo