From patchwork Wed Aug 7 06:54:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Mackerras X-Patchwork-Id: 2839932 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id F036EBF535 for ; Wed, 7 Aug 2013 06:57:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E808920166 for ; Wed, 7 Aug 2013 06:57:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 208D32015A for ; Wed, 7 Aug 2013 06:57:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932136Ab3HGG5K (ORCPT ); Wed, 7 Aug 2013 02:57:10 -0400 Received: from ozlabs.org ([203.10.76.45]:39960 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757203Ab3HGG5H (ORCPT ); Wed, 7 Aug 2013 02:57:07 -0400 Received: by ozlabs.org (Postfix, from userid 1003) id EDFE92C0186; Wed, 7 Aug 2013 16:57:05 +1000 (EST) Date: Wed, 7 Aug 2013 16:54:54 +1000 From: Paul Mackerras To: Alexander Graf , Benjamin Herrenschmidt Cc: kvm-ppc@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH RFC 3/5] KVM: PPC: Use load_fp/vr_state rather than load_up_fpu/altivec Message-ID: <20130807065454.GI31007@iris.ozlabs.ibm.com> References: <20130807065220.GF31007@iris.ozlabs.ibm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20130807065220.GF31007@iris.ozlabs.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The load_up_fpu and load_up_altivec functions were never intended to be called from C, and do things like modifying the MSR value in their callers' stack frames, which are assumed to be interrupt frames. In addition, on 32-bit Book S they require the MMU to be off. This makes KVM use the new load_fp_state() and load_vr_state() functions instead of load_up_fpu/altivec. This means we can remove the assembler glue in book3s_rmhandlers.S, and potentially fixes a bug on Book E, where load_up_fpu was called directly from C. Signed-off-by: Paul Mackerras --- arch/powerpc/include/asm/kvm_book3s.h | 3 --- arch/powerpc/include/asm/switch_to.h | 2 -- arch/powerpc/kvm/book3s_exports.c | 4 --- arch/powerpc/kvm/book3s_pr.c | 18 +++++++++----- arch/powerpc/kvm/book3s_rmhandlers.S | 47 ----------------------------------- arch/powerpc/kvm/booke.h | 3 ++- 6 files changed, 14 insertions(+), 63 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index e711e77..b3a999c 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -186,9 +186,6 @@ extern long kvmppc_hv_get_dirty_log(struct kvm *kvm, extern void kvmppc_entry_trampoline(void); extern void kvmppc_hv_entry_trampoline(void); -extern void kvmppc_load_up_fpu(void); -extern void kvmppc_load_up_altivec(void); -extern void kvmppc_load_up_vsx(void); extern u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst); extern ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst); extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd); diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index 200d763..6afc32e 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -17,12 +17,10 @@ extern struct task_struct *_switch(struct thread_struct *prev, struct thread_struct *next); extern void giveup_fpu(struct task_struct *); -extern void load_up_fpu(void); extern void disable_kernel_fp(void); extern void enable_kernel_fp(void); extern void flush_fp_to_thread(struct task_struct *); extern void enable_kernel_altivec(void); -extern void load_up_altivec(struct task_struct *); extern int emulate_altivec(struct pt_regs *); extern void __giveup_vsx(struct task_struct *); extern void giveup_vsx(struct task_struct *); diff --git a/arch/powerpc/kvm/book3s_exports.c b/arch/powerpc/kvm/book3s_exports.c index 0730d98..0cc64a6 100644 --- a/arch/powerpc/kvm/book3s_exports.c +++ b/arch/powerpc/kvm/book3s_exports.c @@ -25,9 +25,5 @@ EXPORT_SYMBOL_GPL(kvmppc_hv_entry_trampoline); #endif #ifdef CONFIG_KVM_BOOK3S_PR EXPORT_SYMBOL_GPL(kvmppc_entry_trampoline); -EXPORT_SYMBOL_GPL(kvmppc_load_up_fpu); -#ifdef CONFIG_ALTIVEC -EXPORT_SYMBOL_GPL(kvmppc_load_up_altivec); -#endif #endif diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index ca54ae5..dc28a01 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -682,7 +682,8 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, #endif t->fp_state.fpscr = vcpu->arch.fpscr; t->fpexc_mode = 0; - kvmppc_load_up_fpu(); + enable_kernel_fp(); + load_fp_state(&t->fp_state); } if (msr & MSR_VEC) { @@ -690,7 +691,8 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, memcpy(t->vr_state.vr, vcpu->arch.vr, sizeof(vcpu->arch.vr)); t->vr_state.vscr = vcpu->arch.vscr; t->vrsave = -1; - kvmppc_load_up_altivec(); + enable_kernel_altivec(); + load_vr_state(&t->vr_state); #endif } @@ -713,10 +715,14 @@ static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu) if (!lost_ext) return; - if (lost_ext & MSR_FP) - kvmppc_load_up_fpu(); - if (lost_ext & MSR_VEC) - kvmppc_load_up_altivec(); + if (lost_ext & MSR_FP) { + enable_kernel_fp(); + load_fp_state(¤t->thread.fp_state); + } + if (lost_ext & MSR_VEC) { + enable_kernel_altivec(); + load_vr_state(¤t->thread.vr_state); + } current->thread.regs->msr |= lost_ext; } diff --git a/arch/powerpc/kvm/book3s_rmhandlers.S b/arch/powerpc/kvm/book3s_rmhandlers.S index b746c38..a33d2a8 100644 --- a/arch/powerpc/kvm/book3s_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_rmhandlers.S @@ -157,51 +157,4 @@ _GLOBAL(kvmppc_entry_trampoline) mtsrr1 r6 RFI -#if defined(CONFIG_PPC_BOOK3S_32) -#define STACK_LR INT_FRAME_SIZE+4 - -/* load_up_xxx have to run with MSR_DR=0 on Book3S_32 */ -#define MSR_EXT_START \ - PPC_STL r20, _NIP(r1); \ - mfmsr r20; \ - LOAD_REG_IMMEDIATE(r3, MSR_DR|MSR_EE); \ - andc r3,r20,r3; /* Disable DR,EE */ \ - mtmsr r3; \ - sync - -#define MSR_EXT_END \ - mtmsr r20; /* Enable DR,EE */ \ - sync; \ - PPC_LL r20, _NIP(r1) - -#elif defined(CONFIG_PPC_BOOK3S_64) -#define STACK_LR _LINK -#define MSR_EXT_START -#define MSR_EXT_END -#endif - -/* - * Activate current's external feature (FPU/Altivec/VSX) - */ -#define define_load_up(what) \ - \ -_GLOBAL(kvmppc_load_up_ ## what); \ - PPC_STLU r1, -INT_FRAME_SIZE(r1); \ - mflr r3; \ - PPC_STL r3, STACK_LR(r1); \ - MSR_EXT_START; \ - \ - bl FUNC(load_up_ ## what); \ - \ - MSR_EXT_END; \ - PPC_LL r3, STACK_LR(r1); \ - mtlr r3; \ - addi r1, r1, INT_FRAME_SIZE; \ - blr - -define_load_up(fpu) -#ifdef CONFIG_ALTIVEC -define_load_up(altivec) -#endif - #include "book3s_segment.S" diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h index 5fd1ba6..7ffb699 100644 --- a/arch/powerpc/kvm/booke.h +++ b/arch/powerpc/kvm/booke.h @@ -112,7 +112,8 @@ static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu) { #ifdef CONFIG_PPC_FPU if (vcpu->fpu_active && !(current->thread.regs->msr & MSR_FP)) { - load_up_fpu(); + enable_kernel_fp(); + load_fp_state(¤t->thread.fp_state); current->thread.regs->msr |= MSR_FP; } #endif