Re: [Qemu-devel] [PATCH v6 04/16] target-i386: Add x86_set_hyperv.

[Marcelo Tosatti <mtosatti@redhat.com>]

On Tue, Oct 09, 2012 at 03:12:00PM -0400, Don Slutz wrote:
> On 10/09/12 13:17, Marcelo Tosatti wrote:
> >On Tue, Oct 09, 2012 at 01:34:09PM -0300, Marcelo Tosatti wrote:
> >>On Mon, Sep 24, 2012 at 10:32:06AM -0400, Don Slutz wrote:
> >>>This is used to set the cpu object's hypervisor level to the default for Microsoft's Hypervisor.
> >>>
> >>>Signed-off-by: Don Slutz <Don@CloudSwitch.com>
> >>>---
> >>>  target-i386/cpu.c |    9 +++++++++
> >>>  target-i386/cpu.h |    2 ++
> >>>  2 files changed, 11 insertions(+), 0 deletions(-)
> >>>
> >>>diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> >>>index 451de12..48bdaf9 100644
> >>>--- a/target-i386/cpu.c
> >>>+++ b/target-i386/cpu.c
> >>>@@ -1193,6 +1193,12 @@ static void x86_cpuid_set_hv_level(Object *obj, Visitor *v, void *opaque,
> >>>  }
> >>>  #if !defined(CONFIG_USER_ONLY)
> >>>+static void x86_set_hyperv(Object *obj, Error **errp)
> >>>+{
> >>>+    object_property_set_int(obj, CPUID_HV_LEVEL_HYPERV,
> >>>+                            "hypervisor-level", errp);
> >>>+}
> >>>+
> >>>  static void x86_get_hv_spinlocks(Object *obj, Visitor *v, void *opaque,
> >>>                                   const char *name, Error **errp)
> >>>  {
> >>>@@ -1215,6 +1221,7 @@ static void x86_set_hv_spinlocks(Object *obj, Visitor *v, void *opaque,
> >>>          return;
> >>>      }
> >>>      hyperv_set_spinlock_retries(value);
> >>>+    x86_set_hyperv(obj, errp);
> >>>  }
> >>>  static void x86_get_hv_relaxed(Object *obj, Visitor *v, void *opaque,
> >>>@@ -1235,6 +1242,7 @@ static void x86_set_hv_relaxed(Object *obj, Visitor *v, void *opaque,
> >>>          return;
> >>>      }
> >>>      hyperv_enable_relaxed_timing(value);
> >>>+    x86_set_hyperv(obj, errp);
> >>>  }
> >>>  }
> >>>  static void x86_get_hv_vapic(Object *obj, Visitor *v, void *opaque,
> >>>@@ -1255,6 +1263,7 @@ static void x86_set_hv_vapic(Object *obj, Visitor *v, void *opaque,
> >>>          return;
> >>>      }
> >>>      hyperv_enable_vapic_recommended(value);
> >>>+    x86_set_hyperv(obj, errp);
> >>>  }
> >>>  #endif
> >>>diff --git a/target-i386/cpu.h b/target-i386/cpu.h
> >>>index 1899f69..3152a4e 100644
> >>>--- a/target-i386/cpu.h
> >>>+++ b/target-i386/cpu.h
> >>>@@ -488,6 +488,8 @@
> >>>  #define CPUID_VENDOR_VIA   "CentaurHauls"
> >>>+#define CPUID_HV_LEVEL_HYPERV  0x40000005
> >>>+
> >>Where this comes from?
> >>
> >>http://msdn.microsoft.com/en-us/library/windows/hardware/ff542428%28v=vs.85%29.aspx
> >>
> >>has under "Leaf 0x40000000" (at very top of table):
> >>
> >>EAX
> >>
> >>The maximum input value for hypervisor CPUID information. For Microsoft
> >>hypervisors, this value will be at least 0x40000005. The vendor ID
> >>signature should be used only for reporting and diagnostic purposes.
> >>
> >>Is that the same 0x40000005 as in this patch?
> >Yes, the #define can be reused:
> >
> >#define HYPERV_CPUID_MIN                        0x40000005
> >
> Not as simple as it seems.
> 
> http://lists.nongnu.org/archive/html/qemu-devel/2012-09/msg03359.html
> 
> I can make sure this info is part of the commit message.
>     -Don Slutz

Ok add a copy but have CPUID_MIN in the name (because
CPUID_HV_LEVEL_HYPERV is very confusing). Add a comment 

/* maximum input value for h...