[RFC/RFT PATCH 10/19] x86/kvm: Use RIP-relative addressing

Ard Biesheuvel
2026-01-08T09:28:24Z

Replace absolute references in inline asm with RIP-relative ones, to
avoid the need for relocation fixups at boot time. This is a
prerequisite for PIE linking, which only permits 64-bit wide
loader-visible absolute references.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/kernel/kvm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index df78ddee0abb..1a0335f328e1 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -807,8 +807,9 @@ extern bool __raw_callee_save___kvm_vcpu_is_preempted(long);
* restoring to/from the stack.
*/
#define PV_VCPU_PREEMPTED_ASM \
- "movq __per_cpu_offset(,%rdi,8), %rax\n\t" \
- "cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax)\n\t" \
+ "0:leaq 0b(%rip), %rax\n\t" \
+ "addq __per_cpu_offset - 0b(%rax,%rdi,8), %rax\n\t" \
+ "cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time-0b(%rax)\n\t" \
"setne %al\n\t"

DEFINE_ASM_FUNC(__raw_callee_save___kvm_vcpu_is_preempted,
--
2.47.3