[PATCH RFC 28/43] KVM: x86: Adapt assembly for PIE support

From: Hou Wenlong
Date: Fri Apr 28 2023 - 05:55:29 EST


Change the assembly code to use only relative references of symbols for
the kernel to be PIE compatible.

Signed-off-by: Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>
Cc: Thomas Garnier <thgarnie@xxxxxxxxxxxx>
Cc: Lai Jiangshan <jiangshan.ljs@xxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
---
arch/x86/kvm/svm/vmenter.S | 10 +++++-----
arch/x86/kvm/vmx/vmenter.S | 2 +-
2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index 8e8295e774f0..25be1a66c59d 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -270,16 +270,16 @@ SYM_FUNC_START(__svm_vcpu_run)
RESTORE_GUEST_SPEC_CTRL_BODY
RESTORE_HOST_SPEC_CTRL_BODY

-10: cmpb $0, kvm_rebooting
+10: cmpb $0, _ASM_RIP(kvm_rebooting)
jne 2b
ud2
-30: cmpb $0, kvm_rebooting
+30: cmpb $0, _ASM_RIP(kvm_rebooting)
jne 4b
ud2
-50: cmpb $0, kvm_rebooting
+50: cmpb $0, _ASM_RIP(kvm_rebooting)
jne 6b
ud2
-70: cmpb $0, kvm_rebooting
+70: cmpb $0, _ASM_RIP(kvm_rebooting)
jne 8b
ud2

@@ -381,7 +381,7 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run)
RESTORE_GUEST_SPEC_CTRL_BODY
RESTORE_HOST_SPEC_CTRL_BODY

-3: cmpb $0, kvm_rebooting
+3: cmpb $0, _ASM_RIP(kvm_rebooting)
jne 2b
ud2

diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 631fd7da2bc3..b7cc3c17736a 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -289,7 +289,7 @@ SYM_INNER_LABEL(vmx_vmexit, SYM_L_GLOBAL)
RET

.Lfixup:
- cmpb $0, kvm_rebooting
+ cmpb $0, _ASM_RIP(kvm_rebooting)
jne .Lvmfail
ud2
.Lvmfail:
--
2.31.1