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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2015-03-20 20:39:43 +1100
committerAlexander Graf <agraf@suse.de>2015-04-21 15:21:29 +0200
commita4bd6eb07ca72d21a7a34499ad34cfef6f527d4e (patch)
treebba74c5424652cc64edb0911da97a670212c418d /arch/powerpc/include
parent31037ecad275e9ad9bc671c34f72b495cf708ca3 (diff)
downloadlinux-a4bd6eb07ca72d21a7a34499ad34cfef6f527d4e.tar.bz2
KVM: PPC: Book3S HV: Add helpers for lock/unlock hpte
This adds helper routines for locking and unlocking HPTEs, and uses them in the rest of the code. We don't change any locking rules in this patch. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/kvm_book3s_64.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 2d81e202bdcc..0789a0f50969 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -85,6 +85,20 @@ static inline long try_lock_hpte(__be64 *hpte, unsigned long bits)
return old == 0;
}
+static inline void unlock_hpte(__be64 *hpte, unsigned long hpte_v)
+{
+ hpte_v &= ~HPTE_V_HVLOCK;
+ asm volatile(PPC_RELEASE_BARRIER "" : : : "memory");
+ hpte[0] = cpu_to_be64(hpte_v);
+}
+
+/* Without barrier */
+static inline void __unlock_hpte(__be64 *hpte, unsigned long hpte_v)
+{
+ hpte_v &= ~HPTE_V_HVLOCK;
+ hpte[0] = cpu_to_be64(hpte_v);
+}
+
static inline int __hpte_actual_psize(unsigned int lp, int psize)
{
int i, shift;