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-rw-r--r--arch/arm64/kvm/hyp/hyp-entry.S65
1 files changed, 41 insertions, 24 deletions
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 689fccbc9de7..46b4dab933d0 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -15,6 +15,30 @@
#include <asm/kvm_mmu.h>
#include <asm/mmu.h>
+.macro save_caller_saved_regs_vect
+ /* x0 and x1 were saved in the vector entry */
+ stp x2, x3, [sp, #-16]!
+ stp x4, x5, [sp, #-16]!
+ stp x6, x7, [sp, #-16]!
+ stp x8, x9, [sp, #-16]!
+ stp x10, x11, [sp, #-16]!
+ stp x12, x13, [sp, #-16]!
+ stp x14, x15, [sp, #-16]!
+ stp x16, x17, [sp, #-16]!
+.endm
+
+.macro restore_caller_saved_regs_vect
+ ldp x16, x17, [sp], #16
+ ldp x14, x15, [sp], #16
+ ldp x12, x13, [sp], #16
+ ldp x10, x11, [sp], #16
+ ldp x8, x9, [sp], #16
+ ldp x6, x7, [sp], #16
+ ldp x4, x5, [sp], #16
+ ldp x2, x3, [sp], #16
+ ldp x0, x1, [sp], #16
+.endm
+
.text
.macro do_el2_call
@@ -143,13 +167,19 @@ el1_error:
b __guest_exit
el2_sync:
- /* Check for illegal exception return, otherwise panic */
+ /* Check for illegal exception return */
mrs x0, spsr_el2
+ tbnz x0, #20, 1f
- /* if this was something else, then panic! */
- tst x0, #PSR_IL_BIT
- b.eq __hyp_panic
+ save_caller_saved_regs_vect
+ stp x29, x30, [sp, #-16]!
+ bl kvm_unexpected_el2_exception
+ ldp x29, x30, [sp], #16
+ restore_caller_saved_regs_vect
+ eret
+
+1:
/* Let's attempt a recovery from the illegal exception return */
get_vcpu_ptr x1, x0
mov x0, #ARM_EXCEPTION_IL
@@ -157,27 +187,14 @@ el2_sync:
el2_error:
- ldp x0, x1, [sp], #16
+ save_caller_saved_regs_vect
+ stp x29, x30, [sp, #-16]!
+
+ bl kvm_unexpected_el2_exception
+
+ ldp x29, x30, [sp], #16
+ restore_caller_saved_regs_vect
- /*
- * Only two possibilities:
- * 1) Either we come from the exit path, having just unmasked
- * PSTATE.A: change the return code to an EL2 fault, and
- * carry on, as we're already in a sane state to handle it.
- * 2) Or we come from anywhere else, and that's a bug: we panic.
- *
- * For (1), x0 contains the original return code and x1 doesn't
- * contain anything meaningful at that stage. We can reuse them
- * as temp registers.
- * For (2), who cares?
- */
- mrs x0, elr_el2
- adr x1, abort_guest_exit_start
- cmp x0, x1
- adr x1, abort_guest_exit_end
- ccmp x0, x1, #4, ne
- b.ne __hyp_panic
- mov x0, #(1 << ARM_EXIT_WITH_SERROR_BIT)
eret
sb