[PATCH v5 21/33] arm64: kvm: Annotate unwind_hint for hyp entry
From: Chen Zhongjin <hidden>
Date: 2022-06-22 15:56:17
Also in:
linux-arch, linux-arm-kernel, linux-kbuild, live-patching, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Symbol __guest_enter and kvm_hyp_vector saved x0, x1 on stack. Symbol __guest_exit and __guest_exit_panic is reached when resuming EL2 execution, and the previous stack pointer gets restored. Add adequate unwind hints. Signed-off-by: Julien Thierry <redacted> Signed-off-by: Chen Zhongjin <redacted> --- arch/arm64/kvm/hyp/entry.S | 5 +++++ arch/arm64/kvm/hyp/hyp-entry.S | 3 +++ 2 files changed, 8 insertions(+)
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index 045d4481c820..81e30d56bf28 100644
--- a/arch/arm64/kvm/hyp/entry.S
+++ b/arch/arm64/kvm/hyp/entry.S@@ -15,6 +15,7 @@ #include <asm/kvm_mmu.h> #include <asm/kvm_mte.h> #include <asm/kvm_ptrauth.h> +#include <asm/unwind_hints.h> .text
@@ -22,6 +23,7 @@ * u64 __guest_enter(struct kvm_vcpu *vcpu); */ SYM_CODE_START(__guest_enter) + UNWIND_HINT_FUNC // x0: vcpu // x1-x17: clobbered by macros // x29: guest context
@@ -88,6 +90,7 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) // vcpu x0-x1 on the stack // If the hyp context is loaded, go straight to hyp_panic + UNWIND_HINT_FUNC get_loaded_vcpu x0, x1 cbnz x0, 1f b hyp_panic
@@ -110,6 +113,7 @@ SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL) // x1: vcpu // x2-x29,lr: vcpu regs // vcpu x0-x1 on the stack + UNWIND_HINT_FUNC sp_offset=16 add x1, x1, #VCPU_CONTEXT
@@ -199,6 +203,7 @@ abort_guest_exit_end: msr daifset, #4 // Mask aborts ret + UNWIND_HINT_FUNC _kvm_extable abort_guest_exit_start, 9997f _kvm_extable abort_guest_exit_end, 9997f 9997:
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 4a65262a4f3a..d72143c59707 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S@@ -151,6 +151,7 @@ SYM_CODE_END(\label) .macro valid_vect target .align 7 + UNWIND_HINT_FUNC 661: esb stp x0, x1, [sp, #-16]!
@@ -162,6 +163,7 @@ check_preamble_length 661b, 662b .macro invalid_vect target .align 7 + UNWIND_HINT_FUNC 661: nop stp x0, x1, [sp, #-16]!
@@ -209,6 +211,7 @@ SYM_CODE_END(__kvm_hyp_vector) .macro hyp_ventry indirect, spectrev2 .align 7 1: esb + UNWIND_HINT_FUNC .if \spectrev2 != 0 spectrev2_smccc_wa1_smc .else
--
2.17.1