In protected nVHE mode the host cannot directly access hypervisor memory, so we will dump the hypervisor stacktrace to a shared buffer with the host. The minimum size do the buffer required, assuming the min frame size of [x29, x30] (2 * sizeof(long)), is half the combined size of the hypervisor and overflow stacks plus an additional entry to delimit the end of the stacktrace. The stacktrace buffers are used later in the seried to dump the nVHE hypervisor stacktrace when using protected-mode. Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx> --- arch/arm64/include/asm/memory.h | 7 +++++++ arch/arm64/kvm/hyp/nvhe/stacktrace.c | 4 ++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 0af70d9abede..28a4893d4b84 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -113,6 +113,13 @@ #define OVERFLOW_STACK_SIZE SZ_4K +/* + * With the minimum frame size of [x29, x30], exactly half the combined + * sizes of the hyp and overflow stacks is needed to save the unwinded + * stacktrace; plus an additional entry to delimit the end. + */ +#define NVHE_STACKTRACE_SIZE ((OVERFLOW_STACK_SIZE + PAGE_SIZE) / 2 + sizeof(long)) + /* * Alignment of kernel segments (e.g. .text, .data). * diff --git a/arch/arm64/kvm/hyp/nvhe/stacktrace.c b/arch/arm64/kvm/hyp/nvhe/stacktrace.c index a3d5b34e1249..69e65b457f1c 100644 --- a/arch/arm64/kvm/hyp/nvhe/stacktrace.c +++ b/arch/arm64/kvm/hyp/nvhe/stacktrace.c @@ -9,3 +9,7 @@ DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack) __aligned(16); + +#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE +DEFINE_PER_CPU(unsigned long [NVHE_STACKTRACE_SIZE/sizeof(long)], pkvm_stacktrace); +#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ -- 2.37.0.170.g444d1eabd0-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
