[Xen-devel] [PATCH v17 13/13] x86/domctl: Don't pause the whole domain if only getting vcpu state

[Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>]

This patch is focused on moving changing hvm_save_one() to save one
typecode from one vcpu and now that the save functions get data from a
single vcpu we can pause the specific vcpu instead of the domain.

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>

---
Changes since V15:
        - Moved pause/unpause calls into hvm_save_one()
        - Re-add the loop in hvm_save_one().
---
 xen/arch/x86/domctl.c   |  2 --
 xen/arch/x86/hvm/save.c | 12 ++++++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 8fbbf3a..cb53980 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -591,12 +591,10 @@ long arch_do_domctl(
              !is_hvm_domain(d) )
             break;
 
-        domain_pause(d);
         ret = hvm_save_one(d, domctl->u.hvmcontext_partial.type,
                            domctl->u.hvmcontext_partial.instance,
                            domctl->u.hvmcontext_partial.buffer,
                            &domctl->u.hvmcontext_partial.bufsz);
-        domain_unpause(d);
 
         if ( !ret )
             copyback = true;
diff --git a/xen/arch/x86/hvm/save.c b/xen/arch/x86/hvm/save.c
index 49741e0..2d35f17 100644
--- a/xen/arch/x86/hvm/save.c
+++ b/xen/arch/x86/hvm/save.c
@@ -149,12 +149,15 @@ int hvm_save_one(struct domain *d, unsigned int typecode, 
unsigned int instance,
         instance >= d->max_vcpus )
         return -ENOENT;
     ctxt.size = hvm_sr_handlers[typecode].size;
-    if ( hvm_sr_handlers[typecode].kind == HVMSR_PER_VCPU )
-        ctxt.size *= d->max_vcpus;
     ctxt.data = xmalloc_bytes(ctxt.size);
     if ( !ctxt.data )
         return -ENOMEM;
 
+    if ( hvm_sr_handlers[typecode].kind == HVMSR_PER_VCPU )
+        vcpu_pause(d->vcpu[instance]);
+    else
+        domain_pause(d);
+
     if ( (rv = hvm_sr_handlers[typecode].save(d->vcpu[instance], &ctxt)) != 0 )
         printk(XENLOG_G_ERR "HVM%d save: failed to save type %"PRIu16" (%d)\n",
                d->domain_id, typecode, rv);
@@ -186,6 +189,11 @@ int hvm_save_one(struct domain *d, unsigned int typecode, 
unsigned int instance,
         }
     }
 
+    if ( hvm_sr_handlers[typecode].kind == HVMSR_PER_VCPU )
+        vcpu_unpause(d->vcpu[instance]);
+    else
+        domain_unpause(d);
+
     xfree(ctxt.data);
     return rv;
 }
-- 
2.7.4


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