From cb2cc20692b8770a63ef139ad0ce14052c25cddd Mon Sep 17 00:00:00 2001 From: Mihai Carabas Date: Wed, 27 Jan 2021 16:59:29 +0200 Subject: pvpanic : update pvpanic spec document Add pvpanic PCI device support details in docs/specs/pvpanic.txt. Signed-off-by: Mihai Carabas Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- docs/specs/pvpanic.txt | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'docs/specs') 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 -------------- -- cgit v1.2.3