diff options
Diffstat (limited to 'arch/arm64/kvm/stacktrace.c')
| -rw-r--r-- | arch/arm64/kvm/stacktrace.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm64/kvm/stacktrace.c b/arch/arm64/kvm/stacktrace.c index 4d5fec3175ff..417665854f86 100644 --- a/arch/arm64/kvm/stacktrace.c +++ b/arch/arm64/kvm/stacktrace.c @@ -21,6 +21,47 @@ #include <asm/stacktrace/nvhe.h> +/* + * kvm_nvhe_stack_kern_va - Convert KVM nVHE HYP stack addresses to a kernel VAs + * + * The nVHE hypervisor stack is mapped in the flexible 'private' VA range, to + * allow for guard pages below the stack. Consequently, the fixed offset address + * translation macros won't work here. + * + * The kernel VA is calculated as an offset from the kernel VA of the hypervisor + * stack base. + * + * Returns true on success and updates @addr to its corresponding kernel VA; + * otherwise returns false. + */ +static bool kvm_nvhe_stack_kern_va(unsigned long *addr, + enum stack_type type) +{ + struct kvm_nvhe_stacktrace_info *stacktrace_info; + unsigned long hyp_base, kern_base, hyp_offset; + + stacktrace_info = this_cpu_ptr_nvhe_sym(kvm_stacktrace_info); + + switch (type) { + case STACK_TYPE_HYP: + kern_base = (unsigned long)*this_cpu_ptr(&kvm_arm_hyp_stack_page); + hyp_base = (unsigned long)stacktrace_info->stack_base; + break; + case STACK_TYPE_OVERFLOW: + kern_base = (unsigned long)this_cpu_ptr_nvhe_sym(overflow_stack); + hyp_base = (unsigned long)stacktrace_info->overflow_stack_base; + break; + default: + return false; + } + + hyp_offset = *addr - hyp_base; + + *addr = kern_base + hyp_offset; + + return true; +} + static bool on_overflow_stack(unsigned long sp, unsigned long size, struct stack_info *info) { |