[Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[David Gibson]

The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
it exists in the abstract address space of RAM regions.

However, the actual usage of this field indicates that it is a concrete
physical address (it's passed as an offset to memory_region_add_subgregion
for example).

So, correct its type to 'hwaddr'.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 include/hw/mem/pc-dimm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
index d83bf30..218dfb0 100644
--- a/include/hw/mem/pc-dimm.h
+++ b/include/hw/mem/pc-dimm.h
@@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
  * @mr: hotplug memory address space container
  */
 typedef struct MemoryHotplugState {
-    ram_addr_t base;
+    hwaddr base;
     MemoryRegion mr;
 } MemoryHotplugState;
 
-- 
2.5.0

Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Igor Mammedov]

On Thu, 21 Jan 2016 12:37:51 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> it exists in the abstract address space of RAM regions.
> 
> However, the actual usage of this field indicates that it is a concrete
> physical address (it's passed as an offset to memory_region_add_subgregion
> for example).
> 
> So, correct its type to 'hwaddr'.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  include/hw/mem/pc-dimm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> index d83bf30..218dfb0 100644
> --- a/include/hw/mem/pc-dimm.h
> +++ b/include/hw/mem/pc-dimm.h
> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
>   * @mr: hotplug memory address space container
>   */
>  typedef struct MemoryHotplugState {
> -    ram_addr_t base;
> +    hwaddr base;
>      MemoryRegion mr;
>  } MemoryHotplugState;
>  

I agree with this fix but that's not the only place where
ram_addr_t needs to be replaced with hwaddr.
For example type of MachineState.[max]ram_size fields needs
to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
on 32-bit hosts are broken since ram_addr_t is 32-bits there
while some targets assume and use it as 64-bit one.

Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Paolo Bonzini]

On 22/01/2016 11:02, Igor Mammedov wrote:
> On Thu, 21 Jan 2016 12:37:51 +1100
> David Gibson <david@gibson.dropbear.id.au> wrote:
> 
>> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
>> it exists in the abstract address space of RAM regions.
>>
>> However, the actual usage of this field indicates that it is a concrete
>> physical address (it's passed as an offset to memory_region_add_subgregion
>> for example).
>>
>> So, correct its type to 'hwaddr'.
>>
>> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
>> ---
>>  include/hw/mem/pc-dimm.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
>> index d83bf30..218dfb0 100644
>> --- a/include/hw/mem/pc-dimm.h
>> +++ b/include/hw/mem/pc-dimm.h
>> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
>>   * @mr: hotplug memory address space container
>>   */
>>  typedef struct MemoryHotplugState {
>> -    ram_addr_t base;
>> +    hwaddr base;
>>      MemoryRegion mr;
>>  } MemoryHotplugState;
>>  
> 
> I agree with this fix but that's not the only place where
> ram_addr_t needs to be replaced with hwaddr.
> For example type of MachineState.[max]ram_size fields needs
> to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> on 32-bit hosts are broken since ram_addr_t is 32-bits there
> while some targets assume and use it as 64-bit one.

But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
more than 4G anyway, so the choice of ram_addr_t is understandable in
that case.

On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
definitely can place 128M of hot plugged memory between say 4096MB and
4224MB.

Paolo

Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Igor Mammedov]

On Fri, 22 Jan 2016 15:21:05 +0100
Paolo Bonzini <pbonzini@redhat.com> wrote:

> On 22/01/2016 11:02, Igor Mammedov wrote:
> > On Thu, 21 Jan 2016 12:37:51 +1100
> > David Gibson <david@gibson.dropbear.id.au> wrote:
> >   
> >> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> >> it exists in the abstract address space of RAM regions.
> >>
> >> However, the actual usage of this field indicates that it is a concrete
> >> physical address (it's passed as an offset to memory_region_add_subgregion
> >> for example).
> >>
> >> So, correct its type to 'hwaddr'.
> >>
> >> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> >> ---
> >>  include/hw/mem/pc-dimm.h | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> >> index d83bf30..218dfb0 100644
> >> --- a/include/hw/mem/pc-dimm.h
> >> +++ b/include/hw/mem/pc-dimm.h
> >> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
> >>   * @mr: hotplug memory address space container
> >>   */
> >>  typedef struct MemoryHotplugState {
> >> -    ram_addr_t base;
> >> +    hwaddr base;
> >>      MemoryRegion mr;
> >>  } MemoryHotplugState;
> >>    
> > 
> > I agree with this fix but that's not the only place where
> > ram_addr_t needs to be replaced with hwaddr.
> > For example type of MachineState.[max]ram_size fields needs
> > to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> > on 32-bit hosts are broken since ram_addr_t is 32-bits there
> > while some targets assume and use it as 64-bit one.  
> 
> But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
> more than 4G anyway, so the choice of ram_addr_t is understandable in
> that case.
QEMU build will probably fail with above config but if it succeeds
then maxmem will be silently truncated.

> 
> On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
> definitely can place 128M of hot plugged memory between say 4096MB and
> 4224MB.
True.

Anyway for this patch
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> 
> Paolo
> 

Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[David Gibson]

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On Fri, Jan 22, 2016 at 03:32:52PM +0100, Igor Mammedov wrote:
> On Fri, 22 Jan 2016 15:21:05 +0100
> Paolo Bonzini <pbonzini@redhat.com> wrote:
> 
> > On 22/01/2016 11:02, Igor Mammedov wrote:
> > > On Thu, 21 Jan 2016 12:37:51 +1100
> > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > >   
> > >> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> > >> it exists in the abstract address space of RAM regions.
> > >>
> > >> However, the actual usage of this field indicates that it is a concrete
> > >> physical address (it's passed as an offset to memory_region_add_subgregion
> > >> for example).
> > >>
> > >> So, correct its type to 'hwaddr'.
> > >>
> > >> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > >> ---
> > >>  include/hw/mem/pc-dimm.h | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> > >> index d83bf30..218dfb0 100644
> > >> --- a/include/hw/mem/pc-dimm.h
> > >> +++ b/include/hw/mem/pc-dimm.h
> > >> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
> > >>   * @mr: hotplug memory address space container
> > >>   */
> > >>  typedef struct MemoryHotplugState {
> > >> -    ram_addr_t base;
> > >> +    hwaddr base;
> > >>      MemoryRegion mr;
> > >>  } MemoryHotplugState;
> > >>    
> > > 
> > > I agree with this fix but that's not the only place where
> > > ram_addr_t needs to be replaced with hwaddr.
> > > For example type of MachineState.[max]ram_size fields needs
> > > to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> > > on 32-bit hosts are broken since ram_addr_t is 32-bits there
> > > while some targets assume and use it as 64-bit one.  
> > 
> > But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
> > more than 4G anyway, so the choice of ram_addr_t is understandable in
> > that case.
> QEMU build will probably fail with above config but if it succeeds
> then maxmem will be silently truncated.
> 
> > 
> > On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
> > definitely can place 128M of hot plugged memory between say 4096MB and
> > 4224MB.
> True.
> 
> Anyway for this patch
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>

Who needs to take this patch?  I'm not sure if I need to do anything
further to push it forwards.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Eduardo Habkost]

On Mon, Feb 01, 2016 at 01:33:09PM +1100, David Gibson wrote:
> On Fri, Jan 22, 2016 at 03:32:52PM +0100, Igor Mammedov wrote:
> > On Fri, 22 Jan 2016 15:21:05 +0100
> > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > 
> > > On 22/01/2016 11:02, Igor Mammedov wrote:
> > > > On Thu, 21 Jan 2016 12:37:51 +1100
> > > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > > >   
> > > >> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> > > >> it exists in the abstract address space of RAM regions.
> > > >>
> > > >> However, the actual usage of this field indicates that it is a concrete
> > > >> physical address (it's passed as an offset to memory_region_add_subgregion
> > > >> for example).
> > > >>
> > > >> So, correct its type to 'hwaddr'.
> > > >>
> > > >> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > >> ---
> > > >>  include/hw/mem/pc-dimm.h | 2 +-
> > > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >>
> > > >> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> > > >> index d83bf30..218dfb0 100644
> > > >> --- a/include/hw/mem/pc-dimm.h
> > > >> +++ b/include/hw/mem/pc-dimm.h
> > > >> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
> > > >>   * @mr: hotplug memory address space container
> > > >>   */
> > > >>  typedef struct MemoryHotplugState {
> > > >> -    ram_addr_t base;
> > > >> +    hwaddr base;
> > > >>      MemoryRegion mr;
> > > >>  } MemoryHotplugState;
> > > >>    
> > > > 
> > > > I agree with this fix but that's not the only place where
> > > > ram_addr_t needs to be replaced with hwaddr.
> > > > For example type of MachineState.[max]ram_size fields needs
> > > > to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> > > > on 32-bit hosts are broken since ram_addr_t is 32-bits there
> > > > while some targets assume and use it as 64-bit one.  
> > > 
> > > But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
> > > more than 4G anyway, so the choice of ram_addr_t is understandable in
> > > that case.
> > QEMU build will probably fail with above config but if it succeeds
> > then maxmem will be silently truncated.
> > 
> > > 
> > > On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
> > > definitely can place 128M of hot plugged memory between say 4096MB and
> > > 4224MB.
> > True.
> > 
> > Anyway for this patch
> > Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> 
> Who needs to take this patch?  I'm not sure if I need to do anything
> further to push it forwards.

Most pc-dimm changes were merged either by me or Michael. I can
merge it if I get an Acked-by from Michael.

Otherwise, Michael has my Acked-by if he wants to merge it
through his tree.

Acked-by: Eduardo Habkost <ehabkost@redhat.com>

-- 
Eduardo

Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[David Gibson]

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On Tue, Feb 02, 2016 at 03:37:12PM -0200, Eduardo Habkost wrote:
> On Mon, Feb 01, 2016 at 01:33:09PM +1100, David Gibson wrote:
> > On Fri, Jan 22, 2016 at 03:32:52PM +0100, Igor Mammedov wrote:
> > > On Fri, 22 Jan 2016 15:21:05 +0100
> > > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > > 
> > > > On 22/01/2016 11:02, Igor Mammedov wrote:
> > > > > On Thu, 21 Jan 2016 12:37:51 +1100
> > > > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > > > >   
> > > > >> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> > > > >> it exists in the abstract address space of RAM regions.
> > > > >>
> > > > >> However, the actual usage of this field indicates that it is a concrete
> > > > >> physical address (it's passed as an offset to memory_region_add_subgregion
> > > > >> for example).
> > > > >>
> > > > >> So, correct its type to 'hwaddr'.
> > > > >>
> > > > >> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > > >> ---
> > > > >>  include/hw/mem/pc-dimm.h | 2 +-
> > > > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > >>
> > > > >> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> > > > >> index d83bf30..218dfb0 100644
> > > > >> --- a/include/hw/mem/pc-dimm.h
> > > > >> +++ b/include/hw/mem/pc-dimm.h
> > > > >> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
> > > > >>   * @mr: hotplug memory address space container
> > > > >>   */
> > > > >>  typedef struct MemoryHotplugState {
> > > > >> -    ram_addr_t base;
> > > > >> +    hwaddr base;
> > > > >>      MemoryRegion mr;
> > > > >>  } MemoryHotplugState;
> > > > >>    
> > > > > 
> > > > > I agree with this fix but that's not the only place where
> > > > > ram_addr_t needs to be replaced with hwaddr.
> > > > > For example type of MachineState.[max]ram_size fields needs
> > > > > to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> > > > > on 32-bit hosts are broken since ram_addr_t is 32-bits there
> > > > > while some targets assume and use it as 64-bit one.  
> > > > 
> > > > But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
> > > > more than 4G anyway, so the choice of ram_addr_t is understandable in
> > > > that case.
> > > QEMU build will probably fail with above config but if it succeeds
> > > then maxmem will be silently truncated.
> > > 
> > > > 
> > > > On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
> > > > definitely can place 128M of hot plugged memory between say 4096MB and
> > > > 4224MB.
> > > True.
> > > 
> > > Anyway for this patch
> > > Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> > 
> > Who needs to take this patch?  I'm not sure if I need to do anything
> > further to push it forwards.
> 
> Most pc-dimm changes were merged either by me or Michael. I can
> merge it if I get an Acked-by from Michael.
> 
> Otherwise, Michael has my Acked-by if he wants to merge it
> through his tree.
> 
> Acked-by: Eduardo Habkost <ehabkost@redhat.com>

Ah, I didn't realise Michael worked in this area.  Adding him to CC..

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Eduardo Habkost]

On Wed, Feb 03, 2016 at 04:08:17PM +1100, David Gibson wrote:
> On Tue, Feb 02, 2016 at 03:37:12PM -0200, Eduardo Habkost wrote:
> > On Mon, Feb 01, 2016 at 01:33:09PM +1100, David Gibson wrote:
> > > On Fri, Jan 22, 2016 at 03:32:52PM +0100, Igor Mammedov wrote:
> > > > On Fri, 22 Jan 2016 15:21:05 +0100
> > > > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > > > 
> > > > > On 22/01/2016 11:02, Igor Mammedov wrote:
> > > > > > On Thu, 21 Jan 2016 12:37:51 +1100
> > > > > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > > > > >   
> > > > > >> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> > > > > >> it exists in the abstract address space of RAM regions.
> > > > > >>
> > > > > >> However, the actual usage of this field indicates that it is a concrete
> > > > > >> physical address (it's passed as an offset to memory_region_add_subgregion
> > > > > >> for example).
> > > > > >>
> > > > > >> So, correct its type to 'hwaddr'.
> > > > > >>
> > > > > >> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > > > >> ---
> > > > > >>  include/hw/mem/pc-dimm.h | 2 +-
> > > > > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > >>
> > > > > >> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> > > > > >> index d83bf30..218dfb0 100644
> > > > > >> --- a/include/hw/mem/pc-dimm.h
> > > > > >> +++ b/include/hw/mem/pc-dimm.h
> > > > > >> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
> > > > > >>   * @mr: hotplug memory address space container
> > > > > >>   */
> > > > > >>  typedef struct MemoryHotplugState {
> > > > > >> -    ram_addr_t base;
> > > > > >> +    hwaddr base;
> > > > > >>      MemoryRegion mr;
> > > > > >>  } MemoryHotplugState;
> > > > > >>    
> > > > > > 
> > > > > > I agree with this fix but that's not the only place where
> > > > > > ram_addr_t needs to be replaced with hwaddr.
> > > > > > For example type of MachineState.[max]ram_size fields needs
> > > > > > to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
> > > > > > on 32-bit hosts are broken since ram_addr_t is 32-bits there
> > > > > > while some targets assume and use it as 64-bit one.  
> > > > > 
> > > > > But on a 32-bit system without CONFIG_XEN_BACKEND you cannot allocate
> > > > > more than 4G anyway, so the choice of ram_addr_t is understandable in
> > > > > that case.
> > > > QEMU build will probably fail with above config but if it succeeds
> > > > then maxmem will be silently truncated.
> > > > 
> > > > > 
> > > > > On the other hand, on a 32-bit system without CONFIG_XEN_BACKEND you
> > > > > definitely can place 128M of hot plugged memory between say 4096MB and
> > > > > 4224MB.
> > > > True.
> > > > 
> > > > Anyway for this patch
> > > > Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> > > 
> > > Who needs to take this patch?  I'm not sure if I need to do anything
> > > further to push it forwards.
> > 
> > Most pc-dimm changes were merged either by me or Michael. I can
> > merge it if I get an Acked-by from Michael.
> > 
> > Otherwise, Michael has my Acked-by if he wants to merge it
> > through his tree.
> > 
> > Acked-by: Eduardo Habkost <ehabkost@redhat.com>
> 
> Ah, I didn't realise Michael worked in this area.  Adding him to CC..

Ooops, I thought Michael was already on CC. He is the PC and PCI
maintainer, but he has been merging machine.c and other generic
hw/ patches recently.

I sent another message to qemu-devel today, asking people where
could be the default destination for hw/core and other generic
hw/ code that has no maintainer in MAINTAINERS.

-- 
Eduardo