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From: Peter Xu <peterx@redhat.com>
To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <rth@twiddle.net>
Subject: Re: [PATCH 0/8] memory: Sanity checks memory transaction when releasing BQL
Date: Sat, 23 May 2020 16:30:18 -0400
Message-ID: <20200523203018.GJ766834@xz-x1> (raw)
In-Reply-To: <20200421162108.594796-1-peterx@redhat.com>

On Tue, Apr 21, 2020 at 12:21:00PM -0400, Peter Xu wrote:
> This is a continuous work of previous discussion on memory transactions [1].
> It should be helpful to fail QEMU far earlier if there's misuse of BQL against
> the QEMU memory model.
> 
> One example is run_on_cpu() during memory commit.  That'll work previously, but
> it'll fail with very strange errors (like KVM ioctl failure due to memslot
> already existed, and it's not guaranteed to trigger constantly).  Now it'll
> directly fail when run_on_cpu() is called.
> 
> Please have a look, thanks.
> 
> [1] https://lists.gnu.org/archive/html/qemu-devel/2020-04/msg03205.html

Still think it as something good to have...  Any comments?  Thanks,

-- 
Peter Xu



      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 16:21 Peter Xu
2020-04-21 16:21 ` [PATCH 1/8] memory: Introduce memory_region_transaction_{push|pop}() Peter Xu
2020-04-21 16:21 ` [PATCH 2/8] memory: Don't do topology update in memory finalize() Peter Xu
2020-04-21 16:21 ` [PATCH 3/8] cpus: Use qemu_cond_wait_iothread() where proper Peter Xu
2020-04-21 16:21 ` [PATCH 4/8] cpus: Introduce qemu_cond_timedwait_iothread() Peter Xu
2020-04-21 16:21 ` [PATCH 5/8] cpus: Remove the mutex parameter from do_run_on_cpu() Peter Xu
2020-04-21 16:21 ` [PATCH 6/8] cpus: Introduce qemu_mutex_unlock_iothread_prepare() Peter Xu
2020-04-21 16:21 ` [PATCH 7/8] memory: Assert on no ongoing memory transaction before release BQL Peter Xu
2020-04-21 16:21 ` [PATCH 8/8] memory: Delay the transaction pop() until commit completed Peter Xu
2020-05-23 20:30 ` Peter Xu [this message]

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