[PATCH v2 5/7] riscv: kexec: Always build the trampoline page table

[fangyu.yu at linux.alibaba.com]

From: Fangyu Yu <fangyu.yu at linux.alibaba.com>

The trampoline page table and the kexec_tramp_satp value are
currently built only on the crash path. A follow-up patch needs
the same infrastructure for the normal kexec path.

Pull the trampoline build and the WRITE_ONCE() that publishes the
SATP value out of the crash-only else branch in
machine_kexec_prepare(). The crash path keeps recording its own
riscv_kexec_norelocate_pa; the normal path keeps its existing
control_code_buffer copy.

No functional change.

Signed-off-by: Fangyu Yu <fangyu.yu at linux.alibaba.com>
---
 arch/riscv/kernel/machine_kexec.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index 00fdc42d650d..556b76bcf96e 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -119,6 +119,16 @@ machine_kexec_prepare(struct kimage *image)
 		return -EINVAL;
 	}
 
+	/*
+	 * Build the trampoline page table and capture its SATP value.
+	 * The crash path consumes it today; the non-crash kexec path
+	 * will use the same setup as well.
+	 */
+	riscv_kexec_build_tramp((unsigned long)__kexec_tramp_text_start,
+				__pa_symbol(__kexec_tramp_text_start));
+	WRITE_ONCE(kexec_tramp_satp,
+		   PFN_DOWN(__pa_symbol(kexec_tramp_pgd)) | satp_mode);
+
 	/* Copy the assembler code for relocation to the control page */
 	if (image->type != KEXEC_TYPE_CRASH) {
 		control_code_buffer = page_address(image->control_code_page);
@@ -135,19 +145,8 @@ machine_kexec_prepare(struct kimage *image)
 		/* Mark the control page executable */
 		set_memory_x((unsigned long) control_code_buffer, 1);
 	} else {
-		/*
-		 * Crash kexec uses riscv_kexec_norelocate as a trampoline.
-		 * Pre-build the trampoline page tables and capture the
-		 * trampoline SATP value plus the physical address of
-		 * riscv_kexec_norelocate so that the panic path only has
-		 * to switch satp and jump.
-		 */
-		riscv_kexec_build_tramp((unsigned long)__kexec_tramp_text_start,
-					__pa_symbol(__kexec_tramp_text_start));
 		WRITE_ONCE(riscv_kexec_norelocate_pa,
 			   __pa_symbol(&riscv_kexec_norelocate));
-		WRITE_ONCE(kexec_tramp_satp,
-			   PFN_DOWN(__pa_symbol(kexec_tramp_pgd)) | satp_mode);
 	}
 
 	return 0;
-- 
2.50.1