x86/jailhouse: Add infrastructure for running in non-root cell
The Jailhouse hypervisor is able to statically partition a multicore
system into multiple so-called cells. Linux is used as boot loader and
continues to run in the root cell after Jailhouse is enabled. Linux can
also run in non-root cells.
Jailhouse does not emulate usual x86 devices. It also provides no
complex ACPI but basic platform information that the boot loader
forwards via setup data. This adds the infrastructure to detect when
running in a non-root cell so that the platform can be configured as
required in succeeding steps.
Support is limited to x86-64 so far, primarily because no boot loader
stub exists for i386 and, thus, we wouldn't be able to test the 32-bit
path.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: jailhouse-dev@googlegroups.com
Link: https://lkml.kernel.org/r/7f823d077b38b1a70c526b40b403f85688c137d3.1511770314.git.jan.kiszka@siemens.com
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ff4e9cd..fbea8d1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -796,6 +796,14 @@
config PARAVIRT_CLOCK
bool
+config JAILHOUSE_GUEST
+ bool "Jailhouse non-root cell support"
+ depends on X86_64
+ ---help---
+ This option allows to run Linux as guest in a Jailhouse non-root
+ cell. You can leave this option disabled if you only want to start
+ Jailhouse and run Linux afterwards in the root cell.
+
endif #HYPERVISOR_GUEST
config NO_BOOTMEM
