On 2021-04-08 05:05, Pavel Tatashin wrote:
From: James Morse <james.morse@xxxxxxx>
The hyp-stub's el1_sync code doesn't do very much, this can easily fit
in the vectors.
With this, all of the hyp-stubs behaviour is contained in its vectors.
This lets kexec and hibernate copy the hyp-stub when they need its
behaviour, instead of re-implementing it.
Signed-off-by: James Morse <james.morse@xxxxxxx>
[Fixed merging issues]
That's a pretty odd fix IMO.
Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
---
arch/arm64/kernel/hyp-stub.S | 59 ++++++++++++++++++------------------
1 file changed, 29 insertions(+), 30 deletions(-)
diff --git a/arch/arm64/kernel/hyp-stub.S
b/arch/arm64/kernel/hyp-stub.S
index ff329c5c074d..d1a73d0f74e0 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -21,6 +21,34 @@ SYM_CODE_START_LOCAL(\label)
.align 7
b \label
SYM_CODE_END(\label)
+.endm
+
+.macro hyp_stub_el1_sync
+SYM_CODE_START_LOCAL(hyp_stub_el1_sync)
+ .align 7
+ cmp x0, #HVC_SET_VECTORS
+ b.ne 2f
+ msr vbar_el2, x1
+ b 9f
+
+2: cmp x0, #HVC_SOFT_RESTART
+ b.ne 3f
+ mov x0, x2
+ mov x2, x4
+ mov x4, x1
+ mov x1, x3
+ br x4 // no return
+
+3: cmp x0, #HVC_RESET_VECTORS
+ beq 9f // Nothing to reset!
+
+ /* Someone called kvm_call_hyp() against the hyp-stub... */
+ mov_q x0, HVC_STUB_ERR
+ eret
+
+9: mov x0, xzr
+ eret
+SYM_CODE_END(hyp_stub_el1_sync)
You said you tested this on a TX2. I guess you don't care whether
it runs VHE or not...
M.
.endm
.text
@@ -39,7 +67,7 @@ SYM_CODE_START(__hyp_stub_vectors)
invalid_vector hyp_stub_el2h_fiq_invalid // FIQ EL2h
invalid_vector hyp_stub_el2h_error_invalid // Error EL2h
- ventry el1_sync // Synchronous 64-bit EL1
+ hyp_stub_el1_sync // Synchronous 64-bit EL1
invalid_vector hyp_stub_el1_irq_invalid // IRQ 64-bit EL1
invalid_vector hyp_stub_el1_fiq_invalid // FIQ 64-bit EL1
invalid_vector hyp_stub_el1_error_invalid // Error 64-bit EL1
@@ -55,35 +83,6 @@ SYM_CODE_END(__hyp_stub_vectors)
# Check the __hyp_stub_vectors didn't overflow
.org . - (__hyp_stub_vectors_end - __hyp_stub_vectors) + SZ_2K
-
-SYM_CODE_START_LOCAL(el1_sync)
- cmp x0, #HVC_SET_VECTORS
- b.ne 1f
- msr vbar_el2, x1
- b 9f
-
-1: cmp x0, #HVC_VHE_RESTART
- b.eq mutate_to_vhe
-
-2: cmp x0, #HVC_SOFT_RESTART
- b.ne 3f
- mov x0, x2
- mov x2, x4
- mov x4, x1
- mov x1, x3
- br x4 // no return
-
-3: cmp x0, #HVC_RESET_VECTORS
- beq 9f // Nothing to reset!
-
- /* Someone called kvm_call_hyp() against the hyp-stub... */
- mov_q x0, HVC_STUB_ERR
- eret
-
-9: mov x0, xzr
- eret
-SYM_CODE_END(el1_sync)
-
// nVHE? No way! Give me the real thing!
SYM_CODE_START_LOCAL(mutate_to_vhe)
// Sanity check: MMU *must* be off
--
Jazz is not dead. It just smells funny...
