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[PATCH 3/4] pvpanic : update pvpanic spec document

From: Mihai Carabas
Subject: [PATCH 3/4] pvpanic : update pvpanic spec document
Date: Fri, 15 Jan 2021 20:34:05 +0200

Add pvpanic PCI device support details in docs/specs/pvpanic.txt.

Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
 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 a90fbca..974aafd 100644
--- a/docs/specs/pvpanic.txt
+++ b/docs/specs/pvpanic.txt
@@ -1,7 +1,7 @@
-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 
 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 
        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 device
+can enable a pvpanic device by adding '-device pvpanic-pci' to the command
 ACPI Interface

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