acpi: fill AcpiOsWritePciConfiguration and AcpiOsReadPciConfiguration

Start to fill the missing ACPICA OSv primitives in order to be able to fully
initialize ACPICA for use in drivers probe functions.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
acpi: fill AcpiOsInstallInterruptHandler and AcpiOsRemoveInterruptHandler

These are the two missing functions for ACPICA be able to initialize fully.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
acpi: initialize ACPICA subsystem in main_cont()

The initialization is done a this time so everything needed is ready.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
panic: add pvpanic.cc the KVM panic driver

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
panic: create a test which crash OSv for pvpanic testing

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>