diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/host.S')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/host.S | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index b6c0188c4b35..c87c63133e10 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -10,6 +10,7 @@ #include <asm/kvm_arm.h> #include <asm/kvm_asm.h> #include <asm/kvm_mmu.h> +#include <asm/kvm_ptrauth.h> .text @@ -37,10 +38,43 @@ SYM_FUNC_START(__host_exit) /* Save the host context pointer in x29 across the function call */ mov x29, x0 + +#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL +alternative_if_not ARM64_HAS_ADDRESS_AUTH +b __skip_pauth_save +alternative_else_nop_endif + +alternative_if ARM64_KVM_PROTECTED_MODE + /* Save kernel ptrauth keys. */ + add x18, x29, #CPU_APIAKEYLO_EL1 + ptrauth_save_state x18, x19, x20 + + /* Use hyp keys. */ + adr_this_cpu x18, kvm_hyp_ctxt, x19 + add x18, x18, #CPU_APIAKEYLO_EL1 + ptrauth_restore_state x18, x19, x20 + isb +alternative_else_nop_endif +__skip_pauth_save: +#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */ + bl handle_trap - /* Restore host regs x0-x17 */ __host_enter_restore_full: + /* Restore kernel keys. */ +#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL +alternative_if_not ARM64_HAS_ADDRESS_AUTH +b __skip_pauth_restore +alternative_else_nop_endif + +alternative_if ARM64_KVM_PROTECTED_MODE + add x18, x29, #CPU_APIAKEYLO_EL1 + ptrauth_restore_state x18, x19, x20 +alternative_else_nop_endif +__skip_pauth_restore: +#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */ + + /* Restore host regs x0-x17 */ ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)] ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)] ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)] |