Message ID | 20120312093510.GA32194@redhat.com |
---|---|
State | New |
Headers | show |
On Mon, Mar 12, 2012 at 11:35:29AM +0200, Michael S. Tsirkin wrote: > Before we start tweaking and enhancing hardware, I think > it makes sense to document what we currently have, to make > sure we stay compatible. > This documents the hotplug interface for piix. > Stubs for cpu hotplug, PM. > We already have docs/specs/acpi_pci_hotplug.txt, no? > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > --- > docs/acpi.txt | 32 ++++++++++++++++++++++++++++++++ > 1 files changed, 32 insertions(+), 0 deletions(-) > create mode 100644 docs/acpi.txt > > diff --git a/docs/acpi.txt b/docs/acpi.txt > new file mode 100644 > index 0000000..4938d48 > --- /dev/null > +++ b/docs/acpi.txt > @@ -0,0 +1,32 @@ > +QEMU exposes the following registers to guests, > +intended primarily for use by the ACPI interface. > + > +PCI Hotplug > +---- > + > +Events use the standard GPE register: > +GPE 0xafe0 - an ACPI GPE register > + > +Hotplug events set GPE bit 1 (mask 0x2) > + > +The following registers are used for PCI hotplug. > +Each register is 32 bit (4 bytes) long, and has little endian format. > +Bits 0-31 in each register correspond to slots 0-31 on the root bus, > +respectively. > + > +UP 0xae00 - RO - Bit set by host on device insertion (note:existing implementations > + trigger device check event) > +DOWN 0xae04 - RO - Bit set by host on user eject request > +EJ0 0xae08 - WO - Bit set by guest removes all power to device > +RMV 0xae0c - RO - Bit set by host if slot supports hotplug > + (can not change while guest is up) > + > + > +Power management > +---- > +TODO > + > + > +CPU hotplug > +---- > +TODO > -- > 1.7.9.111.gf3fb0 -- Gleb.
On Mon, Mar 12, 2012 at 01:14:10PM +0200, Gleb Natapov wrote: > On Mon, Mar 12, 2012 at 11:35:29AM +0200, Michael S. Tsirkin wrote: > > Before we start tweaking and enhancing hardware, I think > > it makes sense to document what we currently have, to make > > sure we stay compatible. > > This documents the hotplug interface for piix. > > Stubs for cpu hotplug, PM. > > > We already have docs/specs/acpi_pci_hotplug.txt, no? Indeed. I didn't notice it. Alex, so if you change this device you probably want to update the spec :) > > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > > --- > > docs/acpi.txt | 32 ++++++++++++++++++++++++++++++++ > > 1 files changed, 32 insertions(+), 0 deletions(-) > > create mode 100644 docs/acpi.txt > > > > diff --git a/docs/acpi.txt b/docs/acpi.txt > > new file mode 100644 > > index 0000000..4938d48 > > --- /dev/null > > +++ b/docs/acpi.txt > > @@ -0,0 +1,32 @@ > > +QEMU exposes the following registers to guests, > > +intended primarily for use by the ACPI interface. > > + > > +PCI Hotplug > > +---- > > + > > +Events use the standard GPE register: > > +GPE 0xafe0 - an ACPI GPE register > > + > > +Hotplug events set GPE bit 1 (mask 0x2) > > + > > +The following registers are used for PCI hotplug. > > +Each register is 32 bit (4 bytes) long, and has little endian format. > > +Bits 0-31 in each register correspond to slots 0-31 on the root bus, > > +respectively. > > + > > +UP 0xae00 - RO - Bit set by host on device insertion (note:existing implementations > > + trigger device check event) > > +DOWN 0xae04 - RO - Bit set by host on user eject request > > +EJ0 0xae08 - WO - Bit set by guest removes all power to device > > +RMV 0xae0c - RO - Bit set by host if slot supports hotplug > > + (can not change while guest is up) > > + > > + > > +Power management > > +---- > > +TODO > > + > > + > > +CPU hotplug > > +---- > > +TODO > > -- > > 1.7.9.111.gf3fb0 > > -- > Gleb.
On Mon, Mar 12, 2012 at 03:24:39PM +0200, Michael S. Tsirkin wrote: > On Mon, Mar 12, 2012 at 01:14:10PM +0200, Gleb Natapov wrote: > > On Mon, Mar 12, 2012 at 11:35:29AM +0200, Michael S. Tsirkin wrote: > > > Before we start tweaking and enhancing hardware, I think > > > it makes sense to document what we currently have, to make > > > sure we stay compatible. > > > This documents the hotplug interface for piix. > > > Stubs for cpu hotplug, PM. > > > > > We already have docs/specs/acpi_pci_hotplug.txt, no? > > Indeed. I didn't notice it. The commit that adds it has your SOB :) -- Gleb.
diff --git a/docs/acpi.txt b/docs/acpi.txt new file mode 100644 index 0000000..4938d48 --- /dev/null +++ b/docs/acpi.txt @@ -0,0 +1,32 @@ +QEMU exposes the following registers to guests, +intended primarily for use by the ACPI interface. + +PCI Hotplug +---- + +Events use the standard GPE register: +GPE 0xafe0 - an ACPI GPE register + +Hotplug events set GPE bit 1 (mask 0x2) + +The following registers are used for PCI hotplug. +Each register is 32 bit (4 bytes) long, and has little endian format. +Bits 0-31 in each register correspond to slots 0-31 on the root bus, +respectively. + +UP 0xae00 - RO - Bit set by host on device insertion (note:existing implementations + trigger device check event) +DOWN 0xae04 - RO - Bit set by host on user eject request +EJ0 0xae08 - WO - Bit set by guest removes all power to device +RMV 0xae0c - RO - Bit set by host if slot supports hotplug + (can not change while guest is up) + + +Power management +---- +TODO + + +CPU hotplug +---- +TODO
Before we start tweaking and enhancing hardware, I think it makes sense to document what we currently have, to make sure we stay compatible. This documents the hotplug interface for piix. Stubs for cpu hotplug, PM. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- docs/acpi.txt | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) create mode 100644 docs/acpi.txt