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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-06-05 17:38:02 +0530 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-28 15:21:50 +0200 |
| commit | 8f42ab2749d00ea15157ab896cfbed73a247b3e1 (patch) | |
| tree | 2ca02b2e03693367661a77c28746a05852b2ed1b /arch/powerpc/include | |
| parent | 3cd60e31185343d4132ca7cf3c9becb903b3ec1b (diff) | |
| download | lwn-8f42ab2749d00ea15157ab896cfbed73a247b3e1.tar.gz lwn-8f42ab2749d00ea15157ab896cfbed73a247b3e1.zip | |
KVM: PPC: BOOK3S: PR: Emulate virtual timebase register
virtual time base register is a per VM, per cpu register that needs
to be saved and restored on vm exit and entry. Writing to VTB is not
allowed in the privileged mode.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[agraf: fix compile error]
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 9 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/time.h | 9 |
3 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 4a58731a0a72..bd3caeaeebe1 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -505,6 +505,7 @@ struct kvm_vcpu_arch { #endif /* Time base value when we entered the guest */ u64 entry_tb; + u64 entry_vtb; u32 tcr; ulong tsr; /* we need to perform set/clr_bits() which requires ulong */ u32 ivor[64]; diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index bffd89d27301..c8f33816a381 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1203,6 +1203,15 @@ : "r" ((unsigned long)(v)) \ : "memory") +static inline unsigned long mfvtb (void) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + return mfspr(SPRN_VTB); +#endif + return 0; +} + #ifdef __powerpc64__ #if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_FSL_BOOK3E) #define mftb() ({unsigned long rval; \ diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index 1d428e6007ca..03cbada59d3a 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -102,6 +102,15 @@ static inline u64 get_rtc(void) return (u64)hi * 1000000000 + lo; } +static inline u64 get_vtb(void) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + return mfvtb(); +#endif + return 0; +} + #ifdef CONFIG_PPC64 static inline u64 get_tb(void) { |