From patchwork Thu Dec 6 00:41:00 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 204061 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 498FE2C014C for ; Thu, 6 Dec 2012 11:42:28 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753972Ab2LFAlb (ORCPT ); Wed, 5 Dec 2012 19:41:31 -0500 Received: from cantor2.suse.de ([195.135.220.15]:35650 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753915Ab2LFAl3 (ORCPT ); Wed, 5 Dec 2012 19:41:29 -0500 Received: from relay2.suse.de (unknown [195.135.220.254]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id 8DB34A3B99; Thu, 6 Dec 2012 01:41:28 +0100 (CET) From: Alexander Graf To: Marcelo Tosatti Cc: Gleb Natapov , kvm-ppc , KVM list , Paul Mackerras Subject: [PATCH 11/28] KVM: PPC: Book3S PR: Emulate PURR, SPURR and DSCR registers Date: Thu, 6 Dec 2012 01:41:00 +0100 Message-Id: <1354754477-15472-12-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1354754477-15472-1-git-send-email-agraf@suse.de> References: <1354754477-15472-1-git-send-email-agraf@suse.de> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org From: Paul Mackerras This adds basic emulation of the PURR and SPURR registers. We assume we are emulating a single-threaded core, so these advance at the same rate as the timebase. A Linux kernel running on a POWER7 expects to be able to access these registers and is not prepared to handle a program interrupt on accessing them. This also adds a very minimal emulation of the DSCR (data stream control register). Writes are ignored and reads return zero. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_book3s.h | 2 ++ arch/powerpc/kvm/book3s_emulate.c | 16 +++++++++++++++- 2 files changed, 17 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 46763d1..5a56e1c 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -81,6 +81,8 @@ struct kvmppc_vcpu_book3s { u64 sdr1; u64 hior; u64 msr_mask; + u64 purr_offset; + u64 spurr_offset; #ifdef CONFIG_PPC_BOOK3S_32 u32 vsid_pool[VSID_POOL_SIZE]; u32 vsid_next; diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index b9a989d..d31a716 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -22,6 +22,7 @@ #include #include #include +#include #define OP_19_XOP_RFID 18 #define OP_19_XOP_RFI 50 @@ -395,6 +396,12 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val) (mfmsr() & MSR_HV)) vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; break; + case SPRN_PURR: + to_book3s(vcpu)->purr_offset = spr_val - get_tb(); + break; + case SPRN_SPURR: + to_book3s(vcpu)->spurr_offset = spr_val - get_tb(); + break; case SPRN_GQR0: case SPRN_GQR1: case SPRN_GQR2: @@ -412,6 +419,7 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val) case SPRN_CTRLF: case SPRN_CTRLT: case SPRN_L2CR: + case SPRN_DSCR: case SPRN_MMCR0_GEKKO: case SPRN_MMCR1_GEKKO: case SPRN_PMC1_GEKKO: @@ -483,9 +491,15 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val) *spr_val = to_book3s(vcpu)->hid[5]; break; case SPRN_CFAR: - case SPRN_PURR: + case SPRN_DSCR: *spr_val = 0; break; + case SPRN_PURR: + *spr_val = get_tb() + to_book3s(vcpu)->purr_offset; + break; + case SPRN_SPURR: + *spr_val = get_tb() + to_book3s(vcpu)->purr_offset; + break; case SPRN_GQR0: case SPRN_GQR1: case SPRN_GQR2: