riscv: Don't use va_pa_offset on kdump

commit a11c07f032a0e9a562a32ece73af96b0e754c4b3 upstream.

On kdump instead of using an intermediate step to relocate the kernel,
that lives in a "control buffer" outside the current kernel's mapping,
we jump to the crash kernel directly by calling riscv_kexec_norelocate().
The current implementation uses va_pa_offset while switching to physical
addressing, however since we moved the kernel outside the linear mapping
this won't work anymore since riscv_kexec_norelocate() is part of the
kernel mapping and we should use kernel_map.va_kernel_pa_offset, and also
take XIP kernel into account.

We don't really need to use va_pa_offset on riscv_kexec_norelocate, we
can just set STVEC to the physical address of the new kernel instead and
let the hart jump to the new kernel on the next instruction after setting
SATP to zero. This fixes kdump and is also simpler/cleaner.

I tested this on the latest qemu and HiFive Unmatched and works as
expected.

Fixes: 2bfc6cd81bd1 ("riscv: Move kernel mapping outside of linear mapping")
Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>
Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/riscv/kernel/kexec_relocate.S b/arch/riscv/kernel/kexec_relocate.S
index a80b52a..059c5e2 100644 (file)
--- a/arch/riscv/kernel/kexec_relocate.S
+++ b/arch/riscv/kernel/kexec_relocate.S
@@ -159,25 +159,15 @@ SYM_CODE_START(riscv_kexec_norelocate)
         * s0: (const) Phys address to jump to
         * s1: (const) Phys address of the FDT image
         * s2: (const) The hartid of the current hart
-        * s3: (const) kernel_map.va_pa_offset, used when switching MMU off
         */
        mv      s0, a1
        mv      s1, a2
        mv      s2, a3
-       mv      s3, a4
 
        /* Disable / cleanup interrupts */
        csrw    CSR_SIE, zero
        csrw    CSR_SIP, zero
 
-       /* Switch to physical addressing */
-       la      s4, 1f
-       sub     s4, s4, s3
-       csrw    CSR_STVEC, s4
-       csrw    CSR_SATP, zero
-
-.align 2
-1:
        /* Pass the arguments to the next kernel  / Cleanup*/
        mv      a0, s2
        mv      a1, s1
@@ -214,7 +204,15 @@ SYM_CODE_START(riscv_kexec_norelocate)
        csrw    CSR_SCAUSE, zero
        csrw    CSR_SSCRATCH, zero
 
-       jalr    zero, a2, 0
+       /*
+        * Switch to physical addressing
+        * This will also trigger a jump to CSR_STVEC
+        * which in this case is the address of the new
+        * kernel.
+        */
+       csrw    CSR_STVEC, a2
+       csrw    CSR_SATP, zero
+
 SYM_CODE_END(riscv_kexec_norelocate)
 
 .section ".rodata"