[PATCH] Add pvevent device driver

[Hu Tao]

pvevent device is used to notify host(qemu) when guest panic
happens.

ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html

Signed-off-by: Hu Tao 
---
 src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
index 23761db..d083245 100644
--- a/src/acpi-dsdt-isa.dsl
+++ b/src/acpi-dsdt-isa.dsl
@@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
             IRQNoFlags() { 3 }
         })
     }
+
+    Device(PEVT) {
+        Name(_HID, "MSFT0001")
+        OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
+        Field(PEOR, ByteAcc, NoLock, Preserve) {
+            PEPT,   8,
+        }
+
+        Method(_STA, 0, NotSerialized) {
+            Store(PEPT, Local0)
+            If (LEqual(Local0, Zero)) {
+                Return (0x00)
+            } Else {
+                Return (0x0F)
+            }
+        }
+
+        Method(RDPT, 0, NotSerialized) {
+            Store(PEPT, Local0)
+            Return (Local0)
+        }
+
+        Method(WRPT, 1, NotSerialized) {
+            Store(Arg0, PEPT)
+        }
+
+        Name(_CRS, ResourceTemplate() {
+            IO(Decode16, 0x0505, 0x0505, 0x01, 0x01)
+        })
+    }
 }

[Gleb Natapov]

On Thu, Mar 14, 2013 at 04:48:47PM +0800, Hu Tao wrote:
> pvevent device is used to notify host(qemu) when guest panic
> happens.
>
> ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html
> Signed-off-by: Hu Tao
>
> src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>
> diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
> index 23761db..d083245 100644
> --- a/src/acpi-dsdt-isa.dsl
> +++ b/src/acpi-dsdt-isa.dsl
> @@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
>              IRQNoFlags() { 3 }
>          })
>      }
> Device(PEVT) {
>    Name(_HID, "MSFT0001")

We cannot use MSFT!
>    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)

IO port should be received form QEMU by fw_cfg and patched here at run time.
>    Field(PEOR, ByteAcc, NoLock, Preserve) {
>        PEPT,   8,
>    }
>    Method(_STA, 0, NotSerialized) {
>        Store(PEPT, Local0)
>        If (LEqual(Local0, Zero)) {
>            Return (0x00)
>        } Else {
>            Return (0x0F)
>        }
>    }

No probing. If QEMU does not provide IO port function should be patched
to return zero.
>    Method(RDPT, 0, NotSerialized) {
>        Store(PEPT, Local0)
>        Return (Local0)
>    }
>    Method(WRPT, 1, NotSerialized) {
>        Store(Arg0, PEPT)
>    }
>    Name(_CRS, ResourceTemplate() {
>        IO(Decode16, 0x0505, 0x0505, 0x01, 0x01)
>    })
> }
> }
>
> 1.8.1.4

[Hu Tao]

On Thu, Mar 14, 2013 at 10:57:18AM +0200, Gleb Natapov wrote:
> On Thu, Mar 14, 2013 at 04:48:47PM +0800, Hu Tao wrote:
> > pvevent device is used to notify host(qemu) when guest panic
> > happens.
> >
> > ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html
> > Signed-off-by: Hu Tao
> >
> > src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >
> > diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
> > index 23761db..d083245 100644
> > --- a/src/acpi-dsdt-isa.dsl
> > +++ b/src/acpi-dsdt-isa.dsl
> > @@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
> >              IRQNoFlags() { 3 }
> >          })
> >      }
> > Device(PEVT) {
> >    Name(_HID, "MSFT0001")
>
> We cannot use MSFT!

OK, I see now, we have to use QEMU0001 or like. More question: if I
request ACPI ID: QEMU  from [e-mail], who should be CCed,
Anthony, qemu-list or any others?
> >    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
>
> IO port should be received form QEMU by fw_cfg and patched here at run time.

If I'm right, io port can be passed to seabios through fw_cfg file
interface, but I'm still figuring out how to patch DSDT here and below at
run time.  Maybe build_ssdt() is close to this.
> >    Field(PEOR, ByteAcc, NoLock, Preserve) {
> >        PEPT,   8,
> >    }
> >    Method(_STA, 0, NotSerialized) {
> >        Store(PEPT, Local0)
> >        If (LEqual(Local0, Zero)) {
> >            Return (0x00)
> >        } Else {
> >            Return (0x0F)
> >        }
> >    }
>
> No probing. If QEMU does not provide IO port function should be patched
> to return zero.
> >    Method(RDPT, 0, NotSerialized) {
> >        Store(PEPT, Local0)
> >        Return (Local0)
> >    }
> >    Method(WRPT, 1, NotSerialized) {
> >        Store(Arg0, PEPT)
> >    }
> >    Name(_CRS, ResourceTemplate() {
> >        IO(Decode16, 0x0505, 0x0505, 0x01, 0x01)
> >    })
> > }
> > }
> >
> > 1.8.1.4

[Gleb Natapov]

On Thu, Mar 14, 2013 at 05:33:19PM +0800, Hu Tao wrote:
> On Thu, Mar 14, 2013 at 10:57:18AM +0200, Gleb Natapov wrote:
> > On Thu, Mar 14, 2013 at 04:48:47PM +0800, Hu Tao wrote:
> > > pvevent device is used to notify host(qemu) when guest panic
> > > happens.
> > >
> > > ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html
> > > Signed-off-by: Hu Tao
> > >
> > > src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
> > >  1 file changed, 30 insertions(+)
> > >
> > > diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
> > > index 23761db..d083245 100644
> > > --- a/src/acpi-dsdt-isa.dsl
> > > +++ b/src/acpi-dsdt-isa.dsl
> > > @@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
> > >              IRQNoFlags() { 3 }
> > >          })
> > >      }
> > > Device(PEVT) {
> > >    Name(_HID, "MSFT0001")
> >
> > We cannot use MSFT!
>
> OK, I see now, we have to use QEMU0001 or like. More question: if I
> request ACPI ID: QEMU  from [e-mail], who should be CCed,
> Anthony, qemu-list or any others?

Cannot really answer that. I do not think mailing list should be
included. My be Anthony should request the ID on behalf of QEMU project.
> > >    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
> >
> > IO port should be received form QEMU by fw_cfg and patched here at run time.
>
> If I'm right, io port can be passed to seabios through fw_cfg file
> interface, but I'm still figuring out how to patch DSDT here and below at
> run time.  Maybe build_ssdt() is close to this.

Yes, we already are doing similar things in build_ssdt().

[David Woodhouse]

On Thu, 2013-03-14 at 10:57 +0200, Gleb Natapov wrote:
> >    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
>
> IO port should be received form QEMU by fw_cfg and patched here at run
> time.

Pfft. ACPI table should be received from QEMU. :)

[Gleb Natapov]

On Thu, Mar 14, 2013 at 10:08:09AM +0000, David Woodhouse wrote:
> On Thu, 2013-03-14 at 10:57 +0200, Gleb Natapov wrote:
> > >    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
> >
> > IO port should be received form QEMU by fw_cfg and patched here at run
> > time.
>
> Pfft. ACPI table should be received from QEMU. :)

That's the feature that, as far as I understand, everyone agreed upon,
but since we want to apply these patches before that feature is here we
will have to do it old fashioned way for now.

[Paolo Bonzini]

Il 14/03/2013 09:48, Hu Tao ha scritto:
> pvevent device is used to notify host(qemu) when guest panic
> happens.
>
> ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html
> Signed-off-by: Hu Tao
>
> src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>
> diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
> index 23761db..d083245 100644
> --- a/src/acpi-dsdt-isa.dsl
> +++ b/src/acpi-dsdt-isa.dsl
> @@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
>              IRQNoFlags() { 3 }
>          })
>      }
> Device(PEVT) {
>    Name(_HID, "MSFT0001")
>    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
>    Field(PEOR, ByteAcc, NoLock, Preserve) {
>        PEPT,   8,
>    }
>    Method(_STA, 0, NotSerialized) {
>        Store(PEPT, Local0)
>        If (LEqual(Local0, Zero)) {
>            Return (0x00)
>        } Else {
>            Return (0x0F)
>        }
>    }
>    Method(RDPT, 0, NotSerialized) {
>        Store(PEPT, Local0)
>        Return (Local0)
>    }
>    Method(WRPT, 1, NotSerialized) {
>        Store(Arg0, PEPT)
>    }
>    Name(_CRS, ResourceTemplate() {
>        IO(Decode16, 0x0505, 0x0505, 0x01, 0x01)
>    })
> }
>
> }

I like the idea of using methods in the DSDT to isolate from the actual
implementation of the device.  I don't see a huge problem with the
probing, but Gleb does so please go on with the fw_cfg part.

Paolo

[Gleb Natapov]

On Thu, Mar 14, 2013 at 10:15:02AM +0100, Paolo Bonzini wrote:
> Il 14/03/2013 09:48, Hu Tao ha scritto:
> > pvevent device is used to notify host(qemu) when guest panic
> > happens.
> >
> > ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html
> > Signed-off-by: Hu Tao
> >
> > src/acpi-dsdt-isa.dsl | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >
> > diff --git a/src/acpi-dsdt-isa.dsl b/src/acpi-dsdt-isa.dsl
> > index 23761db..d083245 100644
> > --- a/src/acpi-dsdt-isa.dsl
> > +++ b/src/acpi-dsdt-isa.dsl
> > @@ -99,4 +99,34 @@ Scope(_SB.PCI0.ISA) {
> >              IRQNoFlags() { 3 }
> >          })
> >      }
> > Device(PEVT) {
> >    Name(_HID, "MSFT0001")
> >    OperationRegion(PEOR, SystemIO, 0x0505, 0x01)
> >    Field(PEOR, ByteAcc, NoLock, Preserve) {
> >        PEPT,   8,
> >    }
> >    Method(_STA, 0, NotSerialized) {
> >        Store(PEPT, Local0)
> >        If (LEqual(Local0, Zero)) {
> >            Return (0x00)
> >        } Else {
> >            Return (0x0F)
> >        }
> >    }
> >    Method(RDPT, 0, NotSerialized) {
> >        Store(PEPT, Local0)
> >        Return (Local0)
> >    }
> >    Method(WRPT, 1, NotSerialized) {
> >        Store(Arg0, PEPT)
> >    }
> >    Name(_CRS, ResourceTemplate() {
> >        IO(Decode16, 0x0505, 0x0505, 0x01, 0x01)
> >    })
> > }
> >
> > }
>
> I like the idea of using methods in the DSDT to isolate from the actual
> implementation of the device.  I don't see a huge problem with the
> probing, but Gleb does so please go on with the fw_cfg part.

Using methods is very nice idea indeed.