[PATCH v4 08/18] KVM: arm64: Add PROTECTED_NVHE_STACKTRACE Kconfig

From: Kalesh Singh
Date: Fri Jul 15 2022 - 02:11:55 EST

This can be used to disable stacktrace for the protected KVM
nVHE hypervisor, in order to save on the associated memory usage.

This option is disabled by default, since protected KVM is not widely
used on platforms other than Android currently.

Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
arch/arm64/kvm/Kconfig | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 8a5fbbf084df..1edab6f8a3b8 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -46,6 +46,21 @@ menuconfig KVM

If unsure, say N.

+ bool "Protected KVM hypervisor stacktraces"
+ depends on KVM
+ default n
+ help
+ Say Y here to enable pKVM hypervisor stacktraces on hyp_panic()
+ If you are not using protected nVHE (pKVM), say N.
+ If using protected nVHE mode, but cannot afford the associated
+ memory cost (less than 0.75 page per CPU) of pKVM stacktraces,
+ say N.
+ If unsure, say N.
bool "Debug mode for non-VHE EL2 object"
depends on KVM