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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 29/33] pvpanic : update pvpanic spec document
Date: Tue, 19 Jan 2021 15:11:00 +0000
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From: Mihai Carabas <mihai.carabas@oracle.com>
Add pvpanic PCI device support details in docs/specs/pvpanic.txt.
Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
[fixed s/device/bus/ error]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
docs/specs/pvpanic.txt | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
index a90fbca72b7..8afcde11cc8 100644
--- a/docs/specs/pvpanic.txt
+++ b/docs/specs/pvpanic.txt
@@ -1,7 +1,7 @@
PVPANIC DEVICE
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=20
-pvpanic device is a simulated ISA device, through which a guest panic
+pvpanic device is a simulated device, through which a guest panic
event is sent to qemu, and a QMP event is generated. This allows
management apps (e.g. libvirt) to be notified and respond to the event.
=20
@@ -9,6 +9,9 @@ The management app has the option of waiting for GUEST_PANI=
CKED events,
and/or polling for guest-panicked RunState, to learn when the pvpanic
device has fired a panic event.
=20
+The pvpanic device can be implemented as an ISA device (using IOPORT) or a=
s a
+PCI device.
+
ISA Interface
-------------
=20
@@ -24,6 +27,14 @@ bit 1: a guest panic has happened and will be handled by=
the guest;
the host should record it or report it, but should not affect
the execution of the guest.
=20
+PCI Interface
+-------------
+
+The PCI interface is similar to the ISA interface except that it uses an M=
MIO
+address space provided by its BAR0, 1 byte long. Any machine with a PCI bus
+can enable a pvpanic device by adding '-device pvpanic-pci' to the command
+line.
+
ACPI Interface
--------------
=20
--=20
2.20.1