diff mbox series

[RFC,v3,6/7] hw/acpi/ich9: Set ACPI PCI hot-plug as default

Message ID 20200924070013.165026-7-jusual@redhat.com
State New
Headers show
Series Use ACPI PCI hot-plug for Q35 | expand

Commit Message

Julia Suvorova Sept. 24, 2020, 7 a.m. UTC 
Signed-off-by: Julia Suvorova <jusual@redhat.com>
---
 hw/acpi/ich9.c | 2 +-
 hw/i386/pc.c   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

Comments

Igor Mammedov Sept. 24, 2020, 9:33 a.m. UTC | #1 
On Thu, 24 Sep 2020 09:00:12 +0200
Julia Suvorova <jusual@redhat.com> wrote:

> Signed-off-by: Julia Suvorova <jusual@redhat.com>


I'd drop this patch for now.
mgmt can turn it on for Windows guests to workaround
its native hotplug issues.

> ---

>  hw/acpi/ich9.c | 2 +-

>  hw/i386/pc.c   | 1 +

>  2 files changed, 2 insertions(+), 1 deletion(-)

> 

> diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c

> index 987f23e388..c67c20de4e 100644

> --- a/hw/acpi/ich9.c

> +++ b/hw/acpi/ich9.c

> @@ -425,7 +425,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)

>      pm->disable_s3 = 0;

>      pm->disable_s4 = 0;

>      pm->s4_val = 2;

> -    pm->use_acpi_hotplug_bridge = false;

> +    pm->use_acpi_hotplug_bridge = true;

>  

>      object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,

>                                     &pm->pm_io_base, OBJ_PROP_FLAG_READ);

> diff --git a/hw/i386/pc.c b/hw/i386/pc.c

> index b55369357e..5de4475570 100644

> --- a/hw/i386/pc.c

> +++ b/hw/i386/pc.c

> @@ -101,6 +101,7 @@ GlobalProperty pc_compat_5_1[] = {};

>  const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);

>  

>  GlobalProperty pc_compat_5_0[] = {

> +    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },

>  };

>  const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);

>
Michael S. Tsirkin Sept. 24, 2020, 9:41 a.m. UTC | #2 
On Thu, Sep 24, 2020 at 11:33:45AM +0200, Igor Mammedov wrote:
> On Thu, 24 Sep 2020 09:00:12 +0200

> Julia Suvorova <jusual@redhat.com> wrote:

> 

> > Signed-off-by: Julia Suvorova <jusual@redhat.com>

> 

> I'd drop this patch for now.

> mgmt can turn it on for Windows guests to workaround

> its native hotplug issues.


It's not just windows either, the hack we have in the hotplug code is an
example of a linux issue.  I'd rather not let management worry about
which type of hotplug is in use. Nothing here sets any policy, this is
strictly a mechanism thing.

> > ---

> >  hw/acpi/ich9.c | 2 +-

> >  hw/i386/pc.c   | 1 +

> >  2 files changed, 2 insertions(+), 1 deletion(-)

> > 

> > diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c

> > index 987f23e388..c67c20de4e 100644

> > --- a/hw/acpi/ich9.c

> > +++ b/hw/acpi/ich9.c

> > @@ -425,7 +425,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)

> >      pm->disable_s3 = 0;

> >      pm->disable_s4 = 0;

> >      pm->s4_val = 2;

> > -    pm->use_acpi_hotplug_bridge = false;

> > +    pm->use_acpi_hotplug_bridge = true;

> >  

> >      object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,

> >                                     &pm->pm_io_base, OBJ_PROP_FLAG_READ);

> > diff --git a/hw/i386/pc.c b/hw/i386/pc.c

> > index b55369357e..5de4475570 100644

> > --- a/hw/i386/pc.c

> > +++ b/hw/i386/pc.c

> > @@ -101,6 +101,7 @@ GlobalProperty pc_compat_5_1[] = {};

> >  const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);

> >  

> >  GlobalProperty pc_compat_5_0[] = {

> > +    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },

> >  };

> >  const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);

> >
Daniel P. Berrangé Sept. 24, 2020, 10:36 a.m. UTC | #3 
On Thu, Sep 24, 2020 at 09:00:12AM +0200, Julia Suvorova wrote:

There needs to be a commit message to explain / justify why this change
is a benefit. You have a nice list of pros/cons in the cover letter
which could serve as a good commit message here.

The cover letter gets discarded, only the commit message is in git
history, so its beneficial to capture that info here.

> Signed-off-by: Julia Suvorova <jusual@redhat.com>
> ---
>  hw/acpi/ich9.c | 2 +-
>  hw/i386/pc.c   | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
> index 987f23e388..c67c20de4e 100644
> --- a/hw/acpi/ich9.c
> +++ b/hw/acpi/ich9.c
> @@ -425,7 +425,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
>      pm->disable_s3 = 0;
>      pm->disable_s4 = 0;
>      pm->s4_val = 2;
> -    pm->use_acpi_hotplug_bridge = false;
> +    pm->use_acpi_hotplug_bridge = true;
>  
>      object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,
>                                     &pm->pm_io_base, OBJ_PROP_FLAG_READ);
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index b55369357e..5de4475570 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -101,6 +101,7 @@ GlobalProperty pc_compat_5_1[] = {};
>  const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);
>  
>  GlobalProperty pc_compat_5_0[] = {
> +    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },
>  };
>  const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);
>  
> -- 
> 2.25.4
> 
> 

Regards,
Daniel
Julia Suvorova Sept. 24, 2020, 2:24 p.m. UTC | #4 
On Thu, Sep 24, 2020 at 12:36 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>

> On Thu, Sep 24, 2020 at 09:00:12AM +0200, Julia Suvorova wrote:

>

> There needs to be a commit message to explain / justify why this change

> is a benefit. You have a nice list of pros/cons in the cover letter

> which could serve as a good commit message here.

>

> The cover letter gets discarded, only the commit message is in git

> history, so its beneficial to capture that info here.


Sure, I'll add it.

> > Signed-off-by: Julia Suvorova <jusual@redhat.com>

> > ---

> >  hw/acpi/ich9.c | 2 +-

> >  hw/i386/pc.c   | 1 +

> >  2 files changed, 2 insertions(+), 1 deletion(-)

> >

> > diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c

> > index 987f23e388..c67c20de4e 100644

> > --- a/hw/acpi/ich9.c

> > +++ b/hw/acpi/ich9.c

> > @@ -425,7 +425,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)

> >      pm->disable_s3 = 0;

> >      pm->disable_s4 = 0;

> >      pm->s4_val = 2;

> > -    pm->use_acpi_hotplug_bridge = false;

> > +    pm->use_acpi_hotplug_bridge = true;

> >

> >      object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,

> >                                     &pm->pm_io_base, OBJ_PROP_FLAG_READ);

> > diff --git a/hw/i386/pc.c b/hw/i386/pc.c

> > index b55369357e..5de4475570 100644

> > --- a/hw/i386/pc.c

> > +++ b/hw/i386/pc.c

> > @@ -101,6 +101,7 @@ GlobalProperty pc_compat_5_1[] = {};

> >  const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);

> >

> >  GlobalProperty pc_compat_5_0[] = {

> > +    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },

> >  };

> >  const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);

> >

> > --

> > 2.25.4

> >

> >

>

> Regards,

> Daniel

> --

> |: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|

> |: https://libvirt.org         -o-            https://fstop138.berrange.com :|

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>
diff mbox series

Patch

diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 987f23e388..c67c20de4e 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -425,7 +425,7 @@  void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
     pm->disable_s3 = 0;
     pm->disable_s4 = 0;
     pm->s4_val = 2;
-    pm->use_acpi_hotplug_bridge = false;
+    pm->use_acpi_hotplug_bridge = true;
 
     object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,
                                    &pm->pm_io_base, OBJ_PROP_FLAG_READ);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index b55369357e..5de4475570 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -101,6 +101,7 @@  GlobalProperty pc_compat_5_1[] = {};
 const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1);
 
 GlobalProperty pc_compat_5_0[] = {
+    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },
 };
 const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);