From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp03.in.ibm.com (e28smtp03.in.ibm.com [122.248.162.3]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id BCFE72C00A7 for ; Wed, 29 Jan 2014 03:44:33 +1100 (EST) Received: from /spool/local by e28smtp03.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 28 Jan 2014 22:14:30 +0530 Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id C125C1258054 for ; Tue, 28 Jan 2014 22:16:12 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay03.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s0SGiOH72097616 for ; Tue, 28 Jan 2014 22:14:24 +0530 Received: from d28av03.in.ibm.com (localhost [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s0SGiS8u020066 for ; Tue, 28 Jan 2014 22:14:28 +0530 From: "Aneesh Kumar K.V" To: agraf@suse.de, benh@kernel.crashing.org, paulus@samba.org Subject: [RFC PATCH 02/10] KVM: PPC: BOOK3S: PR: Emulate virtual timebase register Date: Tue, 28 Jan 2014 22:14:07 +0530 Message-Id: <1390927455-3312-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1390927455-3312-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1390927455-3312-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, "Aneesh Kumar K.V" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , virtual time base register is a per vm register and need to 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 --- arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/include/asm/reg.h | 7 +++++++ arch/powerpc/include/asm/time.h | 12 ++++++++++++ arch/powerpc/kvm/book3s_emulate.c | 3 +++ arch/powerpc/kvm/book3s_pr.c | 3 +++ 5 files changed, 26 insertions(+) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 0a3785271f34..9ebdd12e50a9 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -508,6 +508,7 @@ 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 e789f76c9bc2..6c649355b1e9 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1161,6 +1161,13 @@ #define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : \ : "r" ((unsigned long)(v)) \ : "memory") +#ifdef CONFIG_PPC_BOOK3S_64 +#define mfvtb() ({unsigned long rval; \ + asm volatile("mfspr %0, %1" : \ + "=r" (rval) : "i" (SPRN_VTB)); rval;}) +#else +#define mfvtb() BUG() +#endif #ifdef __powerpc64__ #if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_FSL_BOOK3E) diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index c1f267694acb..1e89dbc665d9 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -101,6 +101,18 @@ static inline u64 get_rtc(void) return (u64)hi * 1000000000 + lo; } +#ifdef CONFIG_PPC_BOOK3S_64 +static inline u64 get_vtb(void) +{ + return mfvtb(); +} +#else +static inline u64 get_vtb(void) +{ + return 0; +} +#endif + #ifdef CONFIG_PPC64 static inline u64 get_tb(void) { diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index e1f1e5e16449..4b58d8a90cb5 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -528,6 +528,9 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val */ *spr_val = vcpu->arch.spurr; break; + case SPRN_VTB: + *spr_val = vcpu->arch.vtb; + break; case SPRN_GQR0: case SPRN_GQR1: case SPRN_GQR2: diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 02231f5193c2..b5598e9cdd09 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -120,6 +120,8 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu, * to find the guest purr and spurr value. */ vcpu->arch.entry_tb = get_tb(); + vcpu->arch.entry_vtb = get_vtb(); + } /* Copy data touched by real-mode code from shadow vcpu back to vcpu */ @@ -171,6 +173,7 @@ out: */ vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb; vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb; + vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb; } static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu) -- 1.8.5.3