Re: [kvm-unit-tests PATCH] powerpc: Fix running the kvm-unit-tests with recent versions of QEMU

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On 12/6/22 11:14, Thomas Huth wrote:
Starting with version 7.0, QEMU starts the pseries guests in 32-bit mode
instead of 64-bit (see QEMU commit 6e3f09c28a - "spapr: Force 32bit when
resetting a core"). This causes our test_64bit() in powerpc/emulator.c
to fail. Let's switch to 64-bit in our startup code instead to fix the
issue.

Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
  powerpc/cstart64.S | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S
index 972851f9..206c518f 100644
--- a/powerpc/cstart64.S
+++ b/powerpc/cstart64.S
@@ -23,6 +23,12 @@
  .globl start
  start:
  	FIXUP_ENDIAN
+	/* Switch to 64-bit mode */
+	mfmsr	r1
+	li	r2,1
+	sldi	r2,r2,63
+	or	r1,r1,r2
+	mtmsrd	r1
  	/*
  	 * We were loaded at QEMU's kernel load address, but we're not
  	 * allowed to link there due to how QEMU deals with linker VMAs,

You could add this define in lib/powerpc/asm/ppc_asm.h  :

#define MSR_SF	0x8000000000000000ul

and possibly use the LOAD_REG_IMMEDIATE macro to set the MSR.

Thanks,

C.






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