[PATCH v2] KVM: ppc: Fix size of the PSPB register

Thomas Huth thuth at redhat.com
Wed Sep 2 19:14:48 AEST 2015

The size of the Problem State Priority Boost Register is only
32 bits, but the kvm_vcpu_arch->pspb variable is declared as
"ulong", ie. 64-bit. However, the assembler code accesses this
variable with 32-bit accesses, and the KVM_REG_PPC_PSPB macro
is defined with SIZE_U32, too, so that the current code is
broken on big endian hosts: kvmppc_get_one_reg_hv() will only
return zero for this register since it is using the wrong half
of the pspb variable. Let's fix this problem by adjusting the
size of the pspb field in the kvm_vcpu_arch structure.

Signed-off-by: Thomas Huth <thuth at redhat.com>
 v2: Updated patch description

 arch/powerpc/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index d91f65b..c825f3a 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -473,7 +473,7 @@ struct kvm_vcpu_arch {
 	ulong ciabr;
 	ulong cfar;
 	ulong ppr;
-	ulong pspb;
+	u32 pspb;
 	ulong fscr;
 	ulong shadow_fscr;
 	ulong ebbhr;

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