On 2020-11-09 16:59, Quentin Perret wrote:

Hey David,

On Monday 09 Nov 2020 at 11:32:26 (+0000), David Brazdil wrote:

quoted

Add helper macro for computing the PA of a kernel symbol in nVHE hyp
code. This will be useful for computing the PA of a PSCI CPU_ON entry
point.

Signed-off-by: David Brazdil <redacted>
---
 arch/arm64/kvm/hyp/nvhe/psci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/psci.c 

b/arch/arm64/kvm/hyp/nvhe/psci.c
index b0b5df590ba5..7510b9e174e9 100644

--- a/arch/arm64/kvm/hyp/nvhe/psci.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci.c

@@ -20,6 +20,16 @@ s64 hyp_physvirt_offset;

 #define __hyp_pa(x) ((phys_addr_t)((x)) + hyp_physvirt_offset)

+#define __hyp_pa_symbol(sym)					\
+	({							\
+		extern char sym[];				\
+		unsigned long kern_va;				\
+								\
+		asm volatile("ldr %0, =%1" : "=r" (kern_va)	\
+					   : "S" (sym));	\
+		kern_va - kimage_voffset;			\
+	})
+

Could this be simplified to __hyp_pa(hyp_symbol_addr(sym))? That would
avoid the dependency on kimage_voffset.

I'm going to move away from evaluating kimage_voffset at runtime anyway,
see [1].

Thanks,

         M.

[1] https://lore.kernel.org/r/20201109175923.445945-1-maz@kernel.org (local)
-- 
Jazz is not dead. It just smells funny...

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