diff options
Diffstat (limited to 'arch/arm64/kvm/reset.c')
| -rw-r--r-- | arch/arm64/kvm/reset.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 0b4326578985..e515b85220b4 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -28,7 +28,9 @@ #include <asm/cputype.h> #include <asm/ptrace.h> #include <asm/kvm_arm.h> +#include <asm/kvm_asm.h> #include <asm/kvm_coproc.h> +#include <asm/kvm_mmu.h> /* * ARMv8 Reset Values @@ -109,3 +111,31 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) return 0; } + +extern char __hyp_idmap_text_start[]; + +unsigned long kvm_hyp_reset_entry(void) +{ + if (!__kvm_cpu_uses_extended_idmap()) { + unsigned long offset; + + /* + * Find the address of __kvm_hyp_reset() in the trampoline page. + * This is present in the running page tables, and the boot page + * tables, so we call the code here to start the trampoline + * dance in reverse. + */ + offset = (unsigned long)__kvm_hyp_reset + - ((unsigned long)__hyp_idmap_text_start & PAGE_MASK); + + return TRAMPOLINE_VA + offset; + } else { + /* + * KVM is running with merged page tables, which don't have the + * trampoline page mapped. We know the idmap is still mapped, + * but can't be called into directly. Use + * __extended_idmap_trampoline to do the call. + */ + return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline); + } +} |