[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH] hostmem: don't use mbind() if host-nodes is epmty
|
From: |
Eduardo Habkost |
|
Subject: |
Re: [PATCH] hostmem: don't use mbind() if host-nodes is epmty |
|
Date: |
Mon, 4 May 2020 11:44:50 -0400 |
On Thu, Apr 30, 2020 at 11:46:06AM -0400, Igor Mammedov wrote:
> Since 5.0 QEMU uses hostmem backend for allocating main guest RAM.
> The backend however calls mbind() which is typically NOP
> in case of default policy/absent host-nodes bitmap.
> However when runing in container with black-listed mbind()
> syscall, QEMU fails to start with error
> "cannot bind memory to host NUMA nodes: Operation not permitted"
> even when user hasn't provided host-nodes to pin to explictly
> (which is the case with -m option)
>
> To fix issue, call mbind() only in case when user has provided
> host-nodes explicitly (i.e. host_nodes bitmap is not empty).
> That should allow to run QEMU in containers with black-listed
> mbind() without memory pinning. If QEMU provided memory-pinning
> is required user still has to white-list mbind() in container
> configuration.
>
> Reported-by: Manuel Hohmann <address@hidden>
> Signed-off-by: Igor Mammedov <address@hidden>
Queued on machine-next, thanks!
--
Eduardo