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Re: [Qemu-devel] [PATCH] backends/hostmem: Ignore ENOSYS while setting M
From: |
Pavel Fedin |
Subject: |
Re: [Qemu-devel] [PATCH] backends/hostmem: Ignore ENOSYS while setting MPOL_DEFAULT |
Date: |
Tue, 27 Oct 2015 15:53:02 +0300 |
Sorry, guys, i forgot to add "v2" and simply sent the mail. Log is:
v1 => v2:
- Removed unnecessary parenthesis
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia
> -----Original Message-----
> From: address@hidden [mailto:qemu-devel-
> address@hidden On Behalf Of Pavel Fedin
> Sent: Tuesday, October 27, 2015 3:52 PM
> To: address@hidden
> Cc: 'Paolo Bonzini'; 'Eduardo Habkost'
> Subject: [Qemu-devel] [PATCH] backends/hostmem: Ignore ENOSYS while setting
> MPOL_DEFAULT
>
> Currently hostmem backend fails if CONFIG_NUMA is enabled for the qemu
> (default), but NUMA is not supported by the kernel. This makes it
> impossible to use ivshmem in such configurations.
>
> This patch fixes the problem by ignoring ENOSYS error if policy is set to
> MPOL_DEFAULT. This way the code behaves in the same way as if CONFIG_NUMA
> was not defined. qemu will still fail if the user specifies some other
> policy, so that the user knows it.
>
> Signed-off-by: Pavel Fedin <address@hidden>
> ---
> backends/hostmem.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/backends/hostmem.c b/backends/hostmem.c
> index 41ba2af..94a4ac0 100644
> --- a/backends/hostmem.c
> +++ b/backends/hostmem.c
> @@ -313,9 +313,11 @@ host_memory_backend_memory_complete(UserCreatable *uc,
> Error **errp)
> assert(maxnode <= MAX_NODES);
> if (mbind(ptr, sz, backend->policy,
> maxnode ? backend->host_nodes : NULL, maxnode + 1, flags))
> {
> - error_setg_errno(errp, errno,
> + if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
> + error_setg_errno(errp, errno,
> "cannot bind memory to host NUMA nodes");
> - return;
> + return;
> + }
> }
> #endif
> /* Preallocate memory after the NUMA policy has been instantiated.
> --
> 1.9.5.msysgit.0
>