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Re: [Qemu-devel] [PATCH v3 2/3] target-ppc: add flag in chech_tlb_flush(
From: |
Nikunj A Dadhania |
Subject: |
Re: [Qemu-devel] [PATCH v3 2/3] target-ppc: add flag in chech_tlb_flush() |
Date: |
Wed, 14 Sep 2016 10:39:26 +0530 |
User-agent: |
Notmuch/0.21 (https://notmuchmail.org) Emacs/25.0.94.1 (x86_64-redhat-linux-gnu) |
Benjamin Herrenschmidt <address@hidden> writes:
> On Wed, 2016-09-14 at 09:23 +0530, Nikunj A Dadhania wrote:
>
> Hr... this is confusing, let me rephrase ;-)
>
>> Due to lazy tlb flushes, propagation of the tlb flush is delayed.
> Moreover, certain operations need to do broadcast flush, this too can
> be
>> delayed until we hit the operation that warrant a broadcast.
>
> Instead:
>
> We flush the qemu TLB lazily. check_tlb_flush is called whenever we
> hit a context synchronizing event or instruction that requires a pending
> flush to be performed.
>
> However, we fail to handle broadcast TLB flush operations. In order
> to fix that efficiently, we want to differenciate whether check_tlb_flush()
> needs to only apply pending local flushes (isync instructions,
> interrupts, ...) or also global pending flush operations. The latter
> is only needed when executing instructions that are defined architecturally
> as synchronizing global TLB flush operations. This in our case is ptesync
> on BookS and tlbsync on BookE along with the paravirtualized hypervisor
> calls.
Nice ;-)
Regards
Nikunj
[Qemu-devel] [PATCH v3 3/3] target-ppc: tlbie should have global effect, Nikunj A Dadhania, 2016/09/12
Re: [Qemu-devel] [PATCH v3 0/3] ppc: Broadcast tlb flush should have global effect, Benjamin Herrenschmidt, 2016/09/12