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Re: [Qemu-devel] qemu vs. kvm: When to flush the coalesced mmio buffer?


From: Gleb Natapov
Subject: Re: [Qemu-devel] qemu vs. kvm: When to flush the coalesced mmio buffer?
Date: Mon, 3 Jan 2011 14:25:08 +0200

On Mon, Jan 03, 2011 at 01:11:32PM +0100, Jan Kiszka wrote:
> Hi again,
> 
> another subtle difference between qemu-kvm and upstream:
> 
> When we leave the guest for an IO window (KVM_RUN returns EINTR or
> EAGAIN), we call kvm_flush_coalesced_mmio_buffer in qemu-kvm but not in
> upstream. When version is better? I can't find any rationales in both
> git logs.
> 
Since coalesced mmio is used to prevent unnecessary exits to userspace
if vcpu thread is already in userspace why not flush coalesced mmio
buffer?

--
                        Gleb.



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