[PATCH 7/7] conf, qemu: consider available CPUs in vcpupin/emulatorpin output

[Daniel Henrique Barboza]

The output of vcpupin and emulatorpin for a domain with vcpu
placement='static' is based on a default bitmap that contains
all possible CPUs in the host, regardless of the CPUs being offline
or not. E.g. for a Linux host with this CPU setup (from lscpu):

On-line CPU(s) list:   0,8,16,24,32,40,(...),184
Off-line CPU(s) list: 1-7,9-15,17-23,25-31,(...),185-191

And a domain with this configuration:

  <vcpu placement='static'>1</vcpu>

'virsh vcpupin' will return the following:

$ sudo ./run tools/virsh vcpupin vcpupin_test
 VCPU   CPU Affinity
----------------------
 0      0-191

This is benign by its own, but can make the user believe that all
CPUs from the 0-191 range are eligible for pinning. Which can lead
to situations like this:

$ sudo ./run tools/virsh vcpupin vcpupin_test 0 1
error: Invalid value '1' for 'cpuset.cpus': Invalid argument

This is exarcebated by the fact that 'virsh vcpuinfo' considers only
available host CPUs in the 'CPU Affinity' field:

$ sudo ./run tools/virsh vcpuinfo vcpupin_test
(...)
CPU Affinity:   y-------y-------y-------(...)

This patch changes the default bitmap of vcpupin and emulatorpin, in
the case of domains with static vcpu placement, to all available CPUs
instead of all possible CPUs. Aside from making it consistent with
the behavior of 'vcpuinfo', users will now have one less incentive to
try to pin a vcpu in an offline CPU.

https://bugzilla.redhat.com/show_bug.cgi?id=1434276

Signed-off-by: Daniel Henrique Barboza <danielhb413 at gmail.com>
---
 src/conf/domain_conf.c | 4 +---
 src/qemu/qemu_driver.c | 7 +------
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 31ba78b950..6f95023aaf 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2089,11 +2089,9 @@ virDomainDefGetVcpuPinInfoHelper(virDomainDefPtr def,
     if (hostcpus < 0)
         return -1;
 
-    if (!(allcpumap = virBitmapNew(hostcpus)))
+    if (!(allcpumap = virHostCPUGetAvailableCPUsBitmap()))
         return -1;
 
-    virBitmapSetAll(allcpumap);
-
     for (i = 0; i < maxvcpus && i < ncpumaps; i++) {
         virDomainVcpuDefPtr vcpu = virDomainDefGetVcpu(def, i);
         virBitmapPtr bitmap = NULL;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index d486ce5278..22f0313394 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5425,7 +5425,6 @@ qemuDomainGetEmulatorPinInfo(virDomainPtr dom,
     virDomainDefPtr def;
     bool live;
     int ret = -1;
-    int hostcpus;
     virBitmapPtr cpumask = NULL;
     g_autoptr(virBitmap) bitmap = NULL;
     virBitmapPtr autoCpuset = NULL;
@@ -5442,9 +5441,6 @@ qemuDomainGetEmulatorPinInfo(virDomainPtr dom,
     if (!(def = virDomainObjGetOneDefState(vm, flags, &live)))
         goto cleanup;
 
-    if ((hostcpus = virHostCPUGetCount()) < 0)
-        goto cleanup;
-
     if (live)
         autoCpuset = QEMU_DOMAIN_PRIVATE(vm)->autoCpuset;
 
@@ -5456,9 +5452,8 @@ qemuDomainGetEmulatorPinInfo(virDomainPtr dom,
                autoCpuset) {
         cpumask = autoCpuset;
     } else {
-        if (!(bitmap = virBitmapNew(hostcpus)))
+        if (!(bitmap = virHostCPUGetAvailableCPUsBitmap()))
             goto cleanup;
-        virBitmapSetAll(bitmap);
         cpumask = bitmap;
     }
 
-- 
2.26.2