KVM: arm64: Fix symbol dependency in __hyp_call_panic_nvhe

[ Upstream commit b38b298aa4397e2dc74a89b4dd3eac9e59b64c96 ]

__hyp_call_panic_nvhe contains inline assembly which did not declare
its dependency on the __hyp_panic_string symbol.

The static-declared string has previously been kept alive because of a use in
__hyp_call_panic_vhe. Fix this in preparation for separating the source files
between VHE and nVHE when the two users land in two different compilation
units. The static variable otherwise gets dropped when compiling the nVHE
source file, causing an undefined symbol linker error later.

Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200625131420.71444-2-dbrazdil@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index d76a3d39b26993c01bebccce5021e4c1633d71ce..6f4838b475d0dd26b6443446eb32568d13e6bdcc 100644 (file)
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -754,7 +754,7 @@ static void __hyp_text __hyp_call_panic_nvhe(u64 spsr, u64 elr, u64 par,
         * making sure it is a kernel address and not a PC-relative
         * reference.
         */
-       asm volatile("ldr %0, =__hyp_panic_string" : "=r" (str_va));
+       asm volatile("ldr %0, =%1" : "=r" (str_va) : "S" (__hyp_panic_string));
 
        __hyp_do_panic(str_va,
                       spsr, elr,