[2/4] python/qemu: accel: Add list_accel() method
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Message ID 20191115180829.10275-3-wainersm@redhat.com
State New
Headers show
Series
  • Untitled series #143186
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Commit Message

Wainer dos Santos Moschetta Nov. 15, 2019, 6:08 p.m. UTC
Since commit cbe6d6365a48 the command `qemu -accel help` returns
the list of accelerators enabled in the QEMU binary. This adds
the list_accel() method which return that same list.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 python/qemu/accel.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Comments

Alex Bennée Dec. 3, 2019, 4:57 p.m. UTC | #1
Wainer dos Santos Moschetta <wainersm@redhat.com> writes:

> Since commit cbe6d6365a48 the command `qemu -accel help` returns
> the list of accelerators enabled in the QEMU binary. This adds
> the list_accel() method which return that same list.
>
> Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
> ---
>  python/qemu/accel.py | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/python/qemu/accel.py b/python/qemu/accel.py
> index 1b825126c5..a63ff980a9 100644
> --- a/python/qemu/accel.py
> +++ b/python/qemu/accel.py
> @@ -18,6 +18,7 @@ accelerators.
>  
>  import logging
>  import os
> +import subprocess
>  
>  LOG = logging.getLogger(__name__)
>  
> @@ -28,6 +29,25 @@ ADDITIONAL_ARCHES = {
>      "aarch64" : "armhf"
>  }
>  
> +def list_accel(qemu_bin):
> +    """
> +    List accelerators enabled in the QEMU binary.
> +
> +    @param qemu_bin (str): path to the QEMU binary.
> +    @raise Exception: if failed to run `qemu -accel help`
> +    @return a list of accelerator names.
> +    """
> +    if not qemu_bin:
> +        return []
> +    try:
> +        out = subprocess.check_output("%s -accel help" % qemu_bin, shell=True)
> +    except:
> +        LOG.debug("Failed to get the list of accelerators in %s" %
> qemu_bin)

Ahh here it is. So I guess either mention the fact we will be using it
in the previous commit or bring it in here when we do use it.

I see we use LOG.debug for a bunch of failure reasons but surely
LOG.error is the more correct level for something that failed? I guess
it doesn't matter as we don't mess with the levels.

> +        raise
> +    lines = out.decode().splitlines()
> +    # Skip the first line which is the header.
> +    return [l.strip() for l in lines[1:] if l]
> +
>  def kvm_available(target_arch=None):
>      host_arch = os.uname()[4]
>      if target_arch and target_arch != host_arch:

Anyway:

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Patch
diff mbox series

diff --git a/python/qemu/accel.py b/python/qemu/accel.py
index 1b825126c5..a63ff980a9 100644
--- a/python/qemu/accel.py
+++ b/python/qemu/accel.py
@@ -18,6 +18,7 @@  accelerators.
 
 import logging
 import os
+import subprocess
 
 LOG = logging.getLogger(__name__)
 
@@ -28,6 +29,25 @@  ADDITIONAL_ARCHES = {
     "aarch64" : "armhf"
 }
 
+def list_accel(qemu_bin):
+    """
+    List accelerators enabled in the QEMU binary.
+
+    @param qemu_bin (str): path to the QEMU binary.
+    @raise Exception: if failed to run `qemu -accel help`
+    @return a list of accelerator names.
+    """
+    if not qemu_bin:
+        return []
+    try:
+        out = subprocess.check_output("%s -accel help" % qemu_bin, shell=True)
+    except:
+        LOG.debug("Failed to get the list of accelerators in %s" % qemu_bin)
+        raise
+    lines = out.decode().splitlines()
+    # Skip the first line which is the header.
+    return [l.strip() for l in lines[1:] if l]
+
 def kvm_available(target_arch=None):
     host_arch = os.uname()[4]
     if target_arch and target_arch != host_arch: