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[v5,3/4] pvpanic : update pvpanic spec document

Message ID 1611144713-21433-4-git-send-email-mihai.carabas@oracle.com
State New
Headers show
Series [v5,1/4] hw/misc/pvpanic: split-out generic and bus dependent code | expand

Commit Message

Mihai Carabas Jan. 20, 2021, 12:11 p.m. UTC
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>
---
 docs/specs/pvpanic.txt | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
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Patch

diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
index a90fbca..8afcde1 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
 --------------