KVM: PPC: Book3S HV: Fix typo in saving DSCR

This fixes a typo in the code that saves the guest DSCR (Data Stream Control Register) into the kvm_vcpu_arch struct on guest exit. The effect of the typo was that the DSCR value was saved in the wrong place, so changes to the DSCR by the guest didn't persist across guest exit and entry, and some host kernel memory got corrupted. Cc: stable@vger.kernel.org [v3.1+] Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

KVM: PPC: Book3S HV: Fix typo in saving DSCR
This fixes a typo in the code that saves the guest DSCR (Data Stream Control Register) into the kvm_vcpu_arch struct on guest exit. The effect of the typo was that the DSCR value was saved in the wrong place, so changes to the DSCR by the guest didn't persist across guest exit and entry, and some host kernel memory got corrupted. Cc: stable@vger.kernel.org [v3.1+] Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paul Mackerras · Paolo Bonzini
1 parent d0d538b9d1
Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff
arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1066,7 +1066,7 @@
 BEGIN_FTR_SECTION
 	mfspr	r8, SPRN_DSCR
 	ld	r7, HSTATE_DSCR(r13)
-	std	r8, VCPU_DSCR(r7)
+	std	r8, VCPU_DSCR(r9)
 	mtspr	SPRN_DSCR, r7
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
...	...	@@ -1066,7 +1066,7 @@
1066	1066	BEGIN_FTR_SECTION
1067	1067	mfspr r8, SPRN_DSCR
1068	1068	ld r7, HSTATE_DSCR(r13)
1069		- std r8, VCPU_DSCR(r7)
	1069	+ std r8, VCPU_DSCR(r9)
1070	1070	mtspr SPRN_DSCR, r7
1071	1071	END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
1072	1072