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authorMihai Carabas <mihai.carabas@oracle.com>2021-01-27 16:59:29 +0200
committerPeter Maydell <peter.maydell@linaro.org>2021-01-29 10:47:28 +0000
commitcb2cc20692b8770a63ef139ad0ce14052c25cddd (patch)
tree187cfb0dfdb600f6071b9ddb423834e081d8e3dc /docs/specs
parentd097b3dcb6214a35613abc60c48517b850349ad0 (diff)
pvpanic : update pvpanic spec document
Add pvpanic PCI device support details in docs/specs/pvpanic.txt. Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/specs')
-rw-r--r--docs/specs/pvpanic.txt13
1 files changed, 12 insertions, 1 deletions
diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
index a90fbca72b..8afcde11cc 100644
--- a/docs/specs/pvpanic.txt
+++ b/docs/specs/pvpanic.txt
@@ -1,7 +1,7 @@
PVPANIC DEVICE
==============
-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.
@@ -9,6 +9,9 @@ The management app has the option of waiting for GUEST_PANICKED events,
and/or polling for guest-panicked RunState, to learn when the pvpanic
device has fired a panic event.
+The pvpanic device can be implemented as an ISA device (using IOPORT) or as a
+PCI device.
+
ISA Interface
-------------
@@ -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.
+PCI Interface
+-------------
+
+The PCI interface is similar to the ISA interface except that it uses an MMIO
+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
--------------