Panics from arm64's nVHE hyp mode are hard to interpret. This series adds some more debug info to help with diagnosis.
Using BUG() in nVHE hyp gives a meaningful address to locate invariants that fail to hold. The host can also look up the bug to provide the file and line, if the debug configs are enabled. Otherwise a kimg address is much more useful than a hyp VA since it can be looked up in vmlinux. The lib/bug.c changes apply on 5.11. This arm64 KVM changes apply on top of the previous panic fix at https://lore.kernel.org/r/20210219122406.1337626-1-asc...@google.com/ >From v1 (https://lore.kernel.org/r/20210223094927.766572-1-asc...@google.com/): - keeping struct bug details in bug.c - using SPSR to distinguish hyp from host - inlined __hyp_panic_string Andrew Scull (4): bug: Remove redundant condition check in report_bug bug: Factor out a getter for a bug's file line KVM: arm64: Use BUG and BUG_ON in nVHE hyp KVM: arm64: Log source when panicking from nVHE hyp arch/arm64/include/asm/kvm_hyp.h | 1 - arch/arm64/include/asm/kvm_mmu.h | 2 + arch/arm64/kernel/image-vars.h | 3 +- arch/arm64/kvm/handle_exit.c | 31 ++++++++++++++ arch/arm64/kvm/hyp/include/hyp/switch.h | 2 - arch/arm64/kvm/hyp/nvhe/host.S | 17 ++++---- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 2 +- arch/arm64/kvm/hyp/nvhe/hyp-smp.c | 6 +-- arch/arm64/kvm/hyp/nvhe/psci-relay.c | 2 - arch/arm64/kvm/hyp/vhe/switch.c | 4 +- include/linux/bug.h | 3 ++ lib/bug.c | 54 +++++++++++++------------ 12 files changed, 77 insertions(+), 50 deletions(-) -- 2.30.0.617.g56c4b15f3c-goog
