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Re: [libvirt] [Xen-devel] [PATCH] libxl: Correctly initialize vcpu bitmap



On 23.07.2013 23:20, Jim Fehlig wrote:
> One comment below in addition to Konrad's...
> 
> Konrad Rzeszutek Wilk wrote:
>> On Mon, Jul 22, 2013 at 12:51:05PM +0200, Stefan Bader wrote:
>>   
>>> This fixes the basic setup but there is likely more to do if things
>>> like manual CPU hirarchy (nodes, cores, threads) to be working.
>>>
>>> Cross-posting to xen-devel to make sure I am doing things correctly.
>>>
>>> -Stefan
>>>
>>>
>>> >From 1ec5e7ea0d3498b9f61b83e8aed87cc3cae106de Mon Sep 17 00:00:00 2001
>>> From: Stefan Bader <stefan bader canonical com>
>>> Date: Fri, 19 Jul 2013 15:20:00 +0200
>>> Subject: [PATCH] libxl: Correctly initialize vcpu bitmap
>>>
>>> The avai_vcpu bitmap has to be allocated before it can be used (using
>>>     
>>
>> avail_vcpu ?
>>
>>   
>>> the maximum allowed value for that). Then for each available VCPU the
>>> bit in the mask has to be set (libxl_bitmap_set takes a bit position
>>> as an argument, not the number of bits to set).
>>>
>>> Without this, I would always only get one VCPU for guests created
>>> through libvirt/libxl.
>>>
>>> Signed-off-by: Stefan Bader <stefan bader canonical com>
>>>     
>>
>> The libxl calling logic looks Ok to me. So from the libxl perspective
>> you can tack on Reviewed-by: Konrad Rzeszutek Wilk <konrad wilk oracle com>
>>
>>   
>>> ---
>>>  src/libxl/libxl_conf.c |   14 +++++++++++---
>>>  1 file changed, 11 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
>>> index 4a0fba9..7592dd2 100644
>>> --- a/src/libxl/libxl_conf.c
>>> +++ b/src/libxl/libxl_conf.c
>>> @@ -331,7 +331,8 @@ error:
>>>  }
>>>  
>>>  static int
>>> -libxlMakeDomBuildInfo(virDomainDefPtr def, libxl_domain_config *d_config)
>>> +libxlMakeDomBuildInfo(libxlDriverPrivatePtr driver, virDomainDefPtr def,
>>> +                      libxl_domain_config *d_config)
>>>  {
>>>      libxl_domain_build_info *b_info = &d_config->b_info;
>>>      int hvm = STREQ(def->os.type, "hvm");
>>> @@ -343,8 +344,15 @@ libxlMakeDomBuildInfo(virDomainDefPtr def, libxl_domain_config *d_config)
>>>          libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_HVM);
>>>      else
>>>          libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PV);
>>> +
>>>      b_info->max_vcpus = def->maxvcpus;
>>> -    libxl_bitmap_set((&b_info->avail_vcpus), def->vcpus);
>>> +    if (libxl_cpu_bitmap_alloc(driver->ctx, &b_info->avail_vcpus,
>>> +                               def->maxvcpus))
>>>     
> 
> You are using the driver-wide libxl_ctx in libxlDriverPrivate here, but
> should be using the per-domain libxl_ctx in libxlDomainObjPrivate
> structure IMO.
> 
> It looks like libxlBuildDomainConfig, which calls libxlMakeDomBuildInfo,
> should have just taken virDomainObjPtr instead of virDomainDefPtr. 
> libxlBuildDomainConfig would then have access to the per-domain
> libxl_ctx, and no longer need the libxlDriverPrivatePtr parameter as well.
> 

So more like attached v2. I am not sure libxlDriverPrivatePtr can really be
dropped (and maybe should not as part of a fix to this issue). Maybe calling
libxl_flask_context_to_sid also should use the per domain context. But at least
libxlMakeVfbList->libxlMakeVfb->virPortAllocatorAcquire sounds a bit like it
might need the driver context.

-Stefan

From 2d4b7e5ae2644e6f7a2ea930d0899ea426cb9c84 Mon Sep 17 00:00:00 2001
From: Stefan Bader <stefan bader canonical com>
Date: Fri, 19 Jul 2013 15:20:00 +0200
Subject: [PATCH] libxl: Correctly initialize vcpu bitmap

The avail_vcpu bitmap has to be allocated before it can be used (using
the maximum allowed value for that). Then for each available VCPU the
bit in the mask has to be set (libxl_bitmap_set takes a bit position
as an argument, not the number of bits to set).

Without this, I would always only get one VCPU for guests created
through libvirt/libxl.

[v2] Use private ctx from virDomainObjPtr->privateData

Signed-off-by: Stefan Bader <stefan bader canonical com>
---
 src/libxl/libxl_conf.c   |   19 +++++++++++++++----
 src/libxl/libxl_conf.h   |    2 +-
 src/libxl/libxl_driver.c |    2 +-
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 4a0fba9..f732135 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -331,8 +331,10 @@ error:
 }
 
 static int
-libxlMakeDomBuildInfo(virDomainDefPtr def, libxl_domain_config *d_config)
+libxlMakeDomBuildInfo(virDomainObjPtr vm, libxl_domain_config *d_config)
 {
+    virDomainDefPtr def = vm->def;
+    libxlDomainObjPrivatePtr priv = vm->privateData;
     libxl_domain_build_info *b_info = &d_config->b_info;
     int hvm = STREQ(def->os.type, "hvm");
     size_t i;
@@ -343,8 +345,15 @@ libxlMakeDomBuildInfo(virDomainDefPtr def, libxl_domain_config *d_config)
         libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_HVM);
     else
         libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PV);
+
     b_info->max_vcpus = def->maxvcpus;
-    libxl_bitmap_set((&b_info->avail_vcpus), def->vcpus);
+    if (libxl_cpu_bitmap_alloc(priv->ctx, &b_info->avail_vcpus,
+                               def->maxvcpus))
+        goto error;
+    libxl_bitmap_set_none(&b_info->avail_vcpus);
+    for (i = 0; i < def->vcpus; i++)
+        libxl_bitmap_set((&b_info->avail_vcpus), i);
+
     if (def->clock.ntimers > 0 &&
         def->clock.timers[0]->name == VIR_DOMAIN_TIMER_NAME_TSC) {
         switch (def->clock.timers[0]->mode) {
@@ -795,14 +804,16 @@ libxlMakeCapabilities(libxl_ctx *ctx)
 
 int
 libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
-                       virDomainDefPtr def, libxl_domain_config *d_config)
+                       virDomainObjPtr vm, libxl_domain_config *d_config)
 {
+    virDomainDefPtr def = vm->def;
+
     libxl_domain_config_init(d_config);
 
     if (libxlMakeDomCreateInfo(driver, def, &d_config->c_info) < 0)
         return -1;
 
-    if (libxlMakeDomBuildInfo(def, d_config) < 0) {
+    if (libxlMakeDomBuildInfo(vm, d_config) < 0) {
         return -1;
     }
 
diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
index 2b4a281..942cdd5 100644
--- a/src/libxl/libxl_conf.h
+++ b/src/libxl/libxl_conf.h
@@ -126,6 +126,6 @@ libxlMakeVfb(libxlDriverPrivatePtr driver,
 
 int
 libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
-                       virDomainDefPtr def, libxl_domain_config *d_config);
+                       virDomainObjPtr vm, libxl_domain_config *d_config);
 
 #endif /* LIBXL_CONF_H */
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 358d387..98b1985 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -968,7 +968,7 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
 
     libxl_domain_config_init(&d_config);
 
-    if (libxlBuildDomainConfig(driver, vm->def, &d_config) < 0)
+    if (libxlBuildDomainConfig(driver, vm, &d_config) < 0)
         goto error;
 
     if (driver->autoballoon && libxlFreeMem(priv, &d_config) < 0) {
-- 
1.7.9.5

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