From patchwork Tue Aug 21 13:52:00 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bharat Bhushan X-Patchwork-Id: 1355101 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id C40A33FC81 for ; Tue, 21 Aug 2012 13:55:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753477Ab2HUNzf (ORCPT ); Tue, 21 Aug 2012 09:55:35 -0400 Received: from [213.199.154.140] ([213.199.154.140]:33183 "EHLO db3outboundpool.messaging.microsoft.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751504Ab2HUNze (ORCPT ); Tue, 21 Aug 2012 09:55:34 -0400 Received: from mail82-db3-R.bigfish.com (10.3.81.232) by DB3EHSOBE008.bigfish.com (10.3.84.28) with Microsoft SMTP Server id 14.1.225.23; Tue, 21 Aug 2012 13:54:22 +0000 Received: from mail82-db3 (localhost [127.0.0.1]) by mail82-db3-R.bigfish.com (Postfix) with ESMTP id C5D264201C8; Tue, 21 Aug 2012 13:54:22 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzzz1202h1082kzz8275bhz2dh2a8h668h839he5bhf0ah1155h) Received: from mail82-db3 (localhost.localdomain [127.0.0.1]) by mail82-db3 (MessageSwitch) id 1345557260354225_8982; Tue, 21 Aug 2012 13:54:20 +0000 (UTC) Received: from DB3EHSMHS016.bigfish.com (unknown [10.3.81.246]) by mail82-db3.bigfish.com (Postfix) with ESMTP id 4E4C2C0047; Tue, 21 Aug 2012 13:54:20 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by DB3EHSMHS016.bigfish.com (10.3.87.116) with Microsoft SMTP Server (TLS) id 14.1.225.23; Tue, 21 Aug 2012 13:54:17 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-005.039d.mgd.msft.net (10.84.1.17) with Microsoft SMTP Server (TLS) id 14.2.309.3; Tue, 21 Aug 2012 08:54:15 -0500 Received: from freescale.com ([10.232.15.72]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with SMTP id q7LDsBR4015939; Tue, 21 Aug 2012 06:54:12 -0700 Received: by freescale.com (sSMTP sendmail emulation); Tue, 21 Aug 2012 19:22:32 +0530 From: Bharat Bhushan To: , , CC: Bharat Bhushan Subject: [PATCH 6/6] KVM: booke/bookehv: Add debug stub support Date: Tue, 21 Aug 2012 19:22:00 +0530 Message-ID: <1345557120-16197-7-git-send-email-Bharat.Bhushan@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1345557120-16197-1-git-send-email-Bharat.Bhushan@freescale.com> References: <1345557120-16197-1-git-send-email-Bharat.Bhushan@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch adds the debug stub support on booke/bookehv. Now QEMU debug stub can use hw breakpoint, watchpoint and software breakpoint to debug guest. Signed-off-by: Bharat Bhushan --- arch/powerpc/include/asm/kvm.h | 29 ++++++- arch/powerpc/include/asm/kvm_host.h | 5 + arch/powerpc/kernel/asm-offsets.c | 26 ++++++ arch/powerpc/kvm/booke.c | 144 +++++++++++++++++++++++++++++---- arch/powerpc/kvm/booke_interrupts.S | 110 +++++++++++++++++++++++++ arch/powerpc/kvm/bookehv_interrupts.S | 141 +++++++++++++++++++++++++++++++- arch/powerpc/kvm/e500mc.c | 3 +- 7 files changed, 435 insertions(+), 23 deletions(-) diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index 61b197e..53479ea 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -25,6 +25,7 @@ /* Select powerpc specific features in */ #define __KVM_HAVE_SPAPR_TCE #define __KVM_HAVE_PPC_SMT +#define __KVM_HAVE_GUEST_DEBUG struct kvm_regs { __u64 pc; @@ -264,7 +265,31 @@ struct kvm_fpu { __u64 fpr[32]; }; + +/* + * Defines for h/w breakpoint, watchpoint (read, write or both) and + * software breakpoint. + * These are used as "type" in KVM_SET_GUEST_DEBUG ioctl and "status" + * for KVM_DEBUG_EXIT. + */ +#define KVMPPC_DEBUG_NONE 0x0 +#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) +#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) +#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) struct kvm_debug_exit_arch { + __u64 pc; + /* + * exception -> returns the exception number. If the KVM_DEBUG_EXIT + * exit is not handled (say not h/w breakpoint or software breakpoint + * set for this address) by qemu then it is supposed to inject this + * exception to guest. + */ + __u32 exception; + /* + * exiting to userspace because of h/w breakpoint, watchpoint + * (read, write or both) and software breakpoint. + */ + __u32 status; }; /* for KVM_SET_GUEST_DEBUG */ @@ -276,10 +301,6 @@ struct kvm_guest_debug_arch { * Type denotes h/w breakpoint, read watchpoint, write * watchpoint or watchpoint (both read and write). */ -#define KVMPPC_DEBUG_NOTYPE 0x0 -#define KVMPPC_DEBUG_BREAKPOINT (1UL << 1) -#define KVMPPC_DEBUG_WATCH_WRITE (1UL << 2) -#define KVMPPC_DEBUG_WATCH_READ (1UL << 3) __u32 type; __u32 pad1; __u64 pad2; diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index c7219c1..3ba465a 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -496,7 +496,12 @@ struct kvm_vcpu_arch { u32 mmucfg; u32 epr; u32 crit_save; + /* guest debug registers*/ struct kvmppc_booke_debug_reg dbg_reg; + /* shadow debug registers */ + struct kvmppc_booke_debug_reg shadow_dbg_reg; + /* host debug registers*/ + struct kvmppc_booke_debug_reg host_dbg_reg; #endif gpa_t paddr_accessed; gva_t vaddr_accessed; diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 555448e..6987821 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -564,6 +564,32 @@ int main(void) DEFINE(VCPU_FAULT_DEAR, offsetof(struct kvm_vcpu, arch.fault_dear)); DEFINE(VCPU_FAULT_ESR, offsetof(struct kvm_vcpu, arch.fault_esr)); DEFINE(VCPU_CRIT_SAVE, offsetof(struct kvm_vcpu, arch.crit_save)); + DEFINE(VCPU_DBSR, offsetof(struct kvm_vcpu, arch.dbsr)); + DEFINE(VCPU_SHADOW_DBG, offsetof(struct kvm_vcpu, arch.shadow_dbg_reg)); + DEFINE(VCPU_HOST_DBG, offsetof(struct kvm_vcpu, arch.host_dbg_reg)); + DEFINE(KVMPPC_DBG_DBCR0, offsetof(struct kvmppc_booke_debug_reg, + dbcr0)); + DEFINE(KVMPPC_DBG_DBCR1, offsetof(struct kvmppc_booke_debug_reg, + dbcr1)); + DEFINE(KVMPPC_DBG_DBCR2, offsetof(struct kvmppc_booke_debug_reg, + dbcr2)); +#ifdef CONFIG_KVM_E500MC + DEFINE(KVMPPC_DBG_DBCR4, offsetof(struct kvmppc_booke_debug_reg, + dbcr4)); +#endif + DEFINE(KVMPPC_DBG_IAC1, offsetof(struct kvmppc_booke_debug_reg, + iac[0])); + DEFINE(KVMPPC_DBG_IAC2, offsetof(struct kvmppc_booke_debug_reg, + iac[1])); + DEFINE(KVMPPC_DBG_IAC3, offsetof(struct kvmppc_booke_debug_reg, + iac[2])); + DEFINE(KVMPPC_DBG_IAC4, offsetof(struct kvmppc_booke_debug_reg, + iac[3])); + DEFINE(KVMPPC_DBG_DAC1, offsetof(struct kvmppc_booke_debug_reg, + dac[0])); + DEFINE(KVMPPC_DBG_DAC2, offsetof(struct kvmppc_booke_debug_reg, + dac[1])); + DEFINE(VCPU_GUEST_DEBUG, offsetof(struct kvm_vcpu, guest_debug)); #endif /* CONFIG_PPC_BOOK3S */ #endif /* CONFIG_KVM */ diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index dd0e5b8..4d82e34 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -132,6 +132,9 @@ void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr) #ifdef CONFIG_KVM_BOOKE_HV new_msr |= MSR_GS; + + if (vcpu->guest_debug) + new_msr |= MSR_DE; #endif vcpu->arch.shared->msr = new_msr; @@ -667,10 +670,21 @@ out: return ret; } -static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) +static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, + int exit_nr) { enum emulation_result er; + if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) && + vcpu->arch.last_inst == KVMPPC_INST_GUEST_GDB) { + run->exit_reason = KVM_EXIT_DEBUG; + run->debug.arch.pc = vcpu->arch.pc; + run->debug.arch.exception = exit_nr; + run->debug.arch.status = 0; + kvmppc_account_exit(vcpu, DEBUG_EXITS); + return RESUME_HOST; + } + er = kvmppc_emulate_instruction(run, vcpu); switch (er) { case EMULATE_DONE: @@ -697,6 +711,44 @@ static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu) default: BUG(); } + + if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_ENABLE) && + (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)) { + run->exit_reason = KVM_EXIT_DEBUG; + return RESUME_HOST; + } +} + +static int kvmppc_handle_debug(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + u32 dbsr; + +#ifndef CONFIG_KVM_BOOKE_HV + if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) + vcpu->arch.pc = mfspr(SPRN_DSRR0); + else + vcpu->arch.pc = mfspr(SPRN_CSRR0); +#endif + dbsr = vcpu->arch.dbsr; + + run->debug.arch.pc = vcpu->arch.pc; + run->debug.arch.status = 0; + vcpu->arch.dbsr = 0; + + if (dbsr & (DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4)) { + run->debug.arch.status |= KVMPPC_DEBUG_BREAKPOINT; + } else { + if (dbsr & (DBSR_DAC1W | DBSR_DAC2W)) + run->debug.arch.status |= KVMPPC_DEBUG_WATCH_WRITE; + else if (dbsr & (DBSR_DAC1R | DBSR_DAC2R)) + run->debug.arch.status |= KVMPPC_DEBUG_WATCH_READ; + if (dbsr & (DBSR_DAC1R | DBSR_DAC1W)) + run->debug.arch.pc = vcpu->arch.shadow_dbg_reg.dac[0]; + else if (dbsr & (DBSR_DAC2R | DBSR_DAC2W)) + run->debug.arch.pc = vcpu->arch.shadow_dbg_reg.dac[1]; + } + + return RESUME_HOST; } static void kvmppc_fill_pt_regs(struct pt_regs *regs) @@ -843,7 +895,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, break; case BOOKE_INTERRUPT_HV_PRIV: - r = emulation_exit(run, vcpu); + r = emulation_exit(run, vcpu, exit_nr); break; case BOOKE_INTERRUPT_PROGRAM: @@ -862,7 +914,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, break; } - r = emulation_exit(run, vcpu); + r = emulation_exit(run, vcpu, exit_nr); break; case BOOKE_INTERRUPT_FP_UNAVAIL: @@ -1052,18 +1104,12 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, } case BOOKE_INTERRUPT_DEBUG: { - u32 dbsr; - - vcpu->arch.pc = mfspr(SPRN_CSRR0); - - /* clear IAC events in DBSR register */ - dbsr = mfspr(SPRN_DBSR); - dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4; - mtspr(SPRN_DBSR, dbsr); - - run->exit_reason = KVM_EXIT_DEBUG; + r = kvmppc_handle_debug(run, vcpu); + if (r == RESUME_HOST) { + run->debug.arch.exception = exit_nr; + run->exit_reason = KVM_EXIT_DEBUG; + } kvmppc_account_exit(vcpu, DEBUG_EXITS); - r = RESUME_HOST; break; } @@ -1403,10 +1449,78 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) return r; } +#define BP_NUM KVMPPC_BOOKE_IAC_NUM +#define WP_NUM KVMPPC_BOOKE_DAC_NUM + int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { - return -EINVAL; + + if (!(dbg->control & KVM_GUESTDBG_ENABLE)) { + /* Clear All debug events */ + vcpu->arch.shadow_dbg_reg.dbcr0 = 0; + vcpu->guest_debug = 0; + return 0; + } + + vcpu->guest_debug = dbg->control; + vcpu->arch.shadow_dbg_reg.dbcr0 = 0; + + if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) + vcpu->arch.shadow_dbg_reg.dbcr0 |= DBCR0_IDM | DBCR0_IC; + + if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { + struct kvmppc_booke_debug_reg *gdbgr = + &(vcpu->arch.shadow_dbg_reg); + int n, b = 0, w = 0; + const u32 bp_code[] = { + DBCR0_IAC1 | DBCR0_IDM, + DBCR0_IAC2 | DBCR0_IDM, + DBCR0_IAC3 | DBCR0_IDM, + DBCR0_IAC4 | DBCR0_IDM + }; + const u32 wp_code[] = { + DBCR0_DAC1W | DBCR0_IDM, + DBCR0_DAC2W | DBCR0_IDM, + DBCR0_DAC1R | DBCR0_IDM, + DBCR0_DAC2R | DBCR0_IDM + }; + +#ifndef CONFIG_KVM_BOOKE_HV + gdbgr->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | + DBCR1_IAC3US | DBCR1_IAC4US; + gdbgr->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US; +#else + gdbgr->dbcr1 = 0; + gdbgr->dbcr2 = 0; +#endif + + for (n = 0; n < (BP_NUM + WP_NUM); n++) { + u32 type = dbg->arch.bp[n].type; + + if (!type) + break; + + if (type & (KVMPPC_DEBUG_WATCH_READ | + KVMPPC_DEBUG_WATCH_WRITE)) { + if (w < WP_NUM) { + if (type & KVMPPC_DEBUG_WATCH_READ) + gdbgr->dbcr0 |= wp_code[w + 2]; + if (type & KVMPPC_DEBUG_WATCH_WRITE) + gdbgr->dbcr0 |= wp_code[w]; + gdbgr->dac[w] = dbg->arch.bp[n].addr; + w++; + } + } else if (type & KVMPPC_DEBUG_BREAKPOINT) { + if (b < BP_NUM) { + gdbgr->dbcr0 |= bp_code[b]; + gdbgr->iac[b] = dbg->arch.bp[n].addr; + b++; + } + } + } + } + return 0; } int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S index dd9c5d4..2202936 100644 --- a/arch/powerpc/kvm/booke_interrupts.S +++ b/arch/powerpc/kvm/booke_interrupts.S @@ -39,6 +39,8 @@ #define HOST_MIN_STACK_SIZE (HOST_NV_GPR(R31) + 4) #define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */ #define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */ +#define DBCR0_AC_BITS (DBCR0_IAC1 | DBCR0_IAC2 | DBCR0_IAC3 | DBCR0_IAC4 | \ + DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W) #define NEED_INST_MASK ((1< 2 + lwz r9, KVMPPC_DBG_IAC3+4(r7) + mtspr SPRN_IAC3, r9 + lwz r9, KVMPPC_DBG_IAC4+4(r7) + mtspr SPRN_IAC4, r9 +#endif + lwz r9, KVMPPC_DBG_DAC1+4(r7) + mtspr SPRN_DAC1, r9 + lwz r9, KVMPPC_DBG_DAC2+4(r7) + mtspr SPRN_DAC2, r9 +skip_load_host_debug: + /* Clear h/w DBSR and save current(guest) DBSR */ + mfspr r9, SPRN_DBSR + mtspr SPRN_DBSR, r9 + isync + andi. r7, r6, NEED_DEBUG_SAVE + beq skip_dbsr_save + /* + * If vcpu->guest_debug flag is set then do not check for + * shared->msr.DE as this debugging (say by QEMU) does not + * depends on shared->msr.de. In these scanerios MSR.DE is + * always set using shared_msr and should be handled always. + */ + lwz r7, VCPU_GUEST_DEBUG(r4) + cmpwi r7, 0 + bne skip_save_trap_event + PPC_LL r3, VCPU_SHARED(r4) +#ifndef CONFIG_64BIT + lwz r3, (VCPU_SHARED_MSR + 4)(r3) +#else + ld r3, (VCPU_SHARED_MSR)(r3) +#endif + andi. r3, r3, MSR_DE + bne skip_save_trap_event + andis. r9, r9, DBSR_TIE@h +skip_save_trap_event: + stw r9, VCPU_DBSR(r4) +skip_dbsr_save: + mtspr SPRN_DBCR0, r8 + /* Save remaining volatile guest register state to vcpu. */ stw r0, VCPU_GPR(R0)(r4) stw r1, VCPU_GPR(R1)(r4) @@ -465,6 +524,57 @@ lightweight_exit: PPC_LD(r3, VCPU_SHARED_SPRG7, r5) mtspr SPRN_SPRG7W, r3 + mfmsr r7 + rlwinm r7, r7, 0, ~MSR_DE + mtmsr r7 + addi r5, r4, VCPU_SHADOW_DBG + addi r7, r4, VCPU_HOST_DBG + lwz r6, 0(r5) + mfspr r8, SPRN_DBCR0 + andis. r3, r6, DBCR0_AC_BITS@h + stw r8, KVMPPC_DBG_DBCR0(r7) + beq skip_load_guest_debug + mfspr r8, SPRN_DBCR1 + stw r8, KVMPPC_DBG_DBCR1(r7) + mfspr r8, SPRN_DBCR2 + stw r8, KVMPPC_DBG_DBCR2(r7) + mfspr r8, SPRN_IAC1 + stw r8, KVMPPC_DBG_IAC1+4(r7) + mfspr r8, SPRN_IAC2 + stw r8, KVMPPC_DBG_IAC2+4(r7) +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + mfspr r8, SPRN_IAC3 + stw r8, KVMPPC_DBG_IAC3+4(r7) + mfspr r8, SPRN_IAC4 + stw r8, KVMPPC_DBG_IAC4+4(r7) +#endif + mfspr r8, SPRN_DAC1 + stw r8, KVMPPC_DBG_DAC1+4(r7) + mfspr r8, SPRN_DAC2 + stw r8, KVMPPC_DBG_DAC2+4(r7) + li r8, 0 + mtspr SPRN_DBCR0, r8 /* disable all debug event */ + lwz r8, KVMPPC_DBG_DBCR1(r5) + mtspr SPRN_DBCR1, r8 + lwz r8, KVMPPC_DBG_DBCR2(r5) + mtspr SPRN_DBCR2, r8 + lwz r8, KVMPPC_DBG_IAC1+4(r5) + mtspr SPRN_IAC1, r8 + lwz r8, KVMPPC_DBG_IAC2+4(r5) + mtspr SPRN_IAC2, r8 +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + lwz r8, KVMPPC_DBG_IAC3+4(r5) + mtspr SPRN_IAC3, r8 + lwz r8, KVMPPC_DBG_IAC4+4(r5) + mtspr SPRN_IAC4, r8 +#endif + lwz r8, KVMPPC_DBG_DAC1+4(r5) + mtspr SPRN_DAC1, r8 + lwz r8, KVMPPC_DBG_DAC2+4(r5) + mtspr SPRN_DAC2, r8 +skip_load_guest_debug: + mtspr SPRN_DBCR0, r6 + #ifdef CONFIG_KVM_EXIT_TIMING /* save enter time */ 1: diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S index 099fe82..d021735 100644 --- a/arch/powerpc/kvm/bookehv_interrupts.S +++ b/arch/powerpc/kvm/bookehv_interrupts.S @@ -59,6 +59,10 @@ #define NEED_EMU 0x00000001 /* emulation -- save nv regs */ #define NEED_DEAR 0x00000002 /* save faulting DEAR */ #define NEED_ESR 0x00000004 /* save faulting ESR */ +#define NEED_DBSR 0x00000008 /* save DBSR */ + +#define DBCR0_AC_BITS (DBCR0_IAC1 | DBCR0_IAC2 | DBCR0_IAC3 | DBCR0_IAC4 | \ + DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W) /* * On entry: @@ -198,6 +202,11 @@ PPC_STL r9, VCPU_FAULT_DEAR(r4) .endif + .if \flags & NEED_DBSR + mfspr r9, SPRN_DBSR + stw r9, VCPU_DBSR(r4) + .endif + b kvmppc_resume_host .endm @@ -292,9 +301,9 @@ kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, SPRN_GSRR0, SPRN_GSRR1, 0 kvm_lvl_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, \ SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0 kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \ - SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, 0 + SPRN_SPRG_RSCRATCH_CRIT, SPRN_CSRR0, SPRN_CSRR1, NEED_DBSR kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \ - SPRN_SPRG_RSCRATCH_DBG, SPRN_DSRR0, SPRN_DSRR1, 0 + SPRN_SPRG_RSCRATCH_DBG, SPRN_DSRR0, SPRN_DSRR1, NEED_DBSR /* Registers: @@ -304,6 +313,56 @@ kvm_lvl_handler BOOKE_INTERRUPT_DEBUG, \ * r14: KVM exit number */ _GLOBAL(kvmppc_resume_host) + /* + * If guest not used debug facility then hw debug registers + * already have proper host values. If guest used debug + * facility then restore host debug registers. + * No Need to save guest debug registers as they are already intact + * in guest/shadow registers. + */ + lwz r9, VCPU_SHADOW_DBG(r4) + rlwinm. r8, r9, 0, ~DBCR0_IDM + beq skip_load_host_debug + lwz r3, VCPU_HOST_DBG(r4) + andis. r9, r9, DBCR0_AC_BITS@h + li r9, 0 + mtspr SPRN_DBCR0, r9 /* disable all debug event */ + beq skip_load_hw_bkpts + lwz r7, VCPU_HOST_DBG+KVMPPC_DBG_DBCR1(r4) + lwz r8, VCPU_HOST_DBG+KVMPPC_DBG_DBCR2(r4) + lwz r9, VCPU_HOST_DBG+KVMPPC_DBG_DBCR4(r4) + mtspr SPRN_DBCR1, r7 + PPC_LD(r6, VCPU_HOST_DBG+KVMPPC_DBG_IAC1, r4) + PPC_LD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC2, r4) + mtspr SPRN_DBCR2, r8 + mtspr SPRN_DBCR4, r9 + mtspr SPRN_IAC1, r6 + mtspr SPRN_IAC2, r7 +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + PPC_LD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC3, r4) + PPC_LD(r8, VCPU_HOST_DBG+KVMPPC_DBG_IAC4, r4) + mtspr SPRN_IAC3, r7 + mtspr SPRN_IAC4, r8 +#endif + PPC_LD(r8, VCPU_HOST_DBG+KVMPPC_DBG_DAC1, r4) + PPC_LD(r9, VCPU_HOST_DBG+KVMPPC_DBG_DAC2, r4) + mtspr SPRN_DAC1, r8 + mtspr SPRN_DAC2, r9 +skip_load_hw_bkpts: + isync + /* Clear h/w DBSR and save current(guest) DBSR */ + mfspr r8, SPRN_DBSR + mtspr SPRN_DBSR, r8 + isync + /* Clear EPCR.DUVD and set host DBCR0 */ + mfspr r8, SPRN_EPCR + rlwinm r8, r8, 0, ~SPRN_EPCR_DUVD + mtspr SPRN_EPCR, r8 + isync + mtspr SPRN_DBCR0, r3 + isync +skip_load_host_debug: + /* Save remaining volatile guest register state to vcpu. */ mfspr r3, SPRN_VRSAVE PPC_STL r0, VCPU_GPR(R0)(r4) @@ -543,6 +602,84 @@ lightweight_exit: mtspr SPRN_SPRG6W, r7 mtspr SPRN_SPRG7W, r8 + mfmsr r7 + rlwinm r7, r7, 0, ~MSR_DE + mtmsr r7 + /* + * Load hw debug registers with guest(shadow) debug registers + * if guest is using the debug facility and also set EPCR.DUVD + * to not allow debug events in HV mode. Do not change the + * debug registers if guest is not using the debug facility. + */ + lwz r6, VCPU_SHADOW_DBG(r4) + rlwinm. r7, r6, 0, ~DBCR0_IDM + beq skip_load_guest_debug + /* Save host DBCR0 */ + mfspr r8, SPRN_DBCR0 + stw r8, VCPU_HOST_DBG(r4) + /* + * Save host DBCR1/2, IACx and DACx and load guest DBCR1/2, + * IACx and DACx if guest using hw breakpoint/watchpoints. + */ + andis. r3, r6, DBCR0_AC_BITS@h + beq skip_hw_bkpts + mfspr r7, SPRN_DBCR1 + stw r7, VCPU_HOST_DBG+KVMPPC_DBG_DBCR1(r4) + mfspr r8, SPRN_DBCR2 + stw r8, VCPU_HOST_DBG+KVMPPC_DBG_DBCR2(r4) + mfspr r7, SPRN_DBCR4 + stw r7, VCPU_HOST_DBG+KVMPPC_DBG_DBCR4(r4) + mfspr r8, SPRN_IAC1 + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_IAC1, r4) + mfspr r7, SPRN_IAC2 + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC2, r4) +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + mfspr r8, SPRN_IAC3 + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_IAC3, r4) + mfspr r7, SPRN_IAC4 + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC4, r4) +#endif + mfspr r8, SPRN_DAC1 + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_DAC1, r4) + mfspr r7, SPRN_DAC2 + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_DAC2, r4) + li r8, 0 + mtspr SPRN_DBCR0, r8 /* disable all debug event */ + lwz r7, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR1(r4) + lwz r8, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR2(r4) + lwz r9, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR4(r4) + mtspr SPRN_DBCR1, r7 + PPC_LD(r7, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC1, r4) + PPC_LD(r3, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC2, r4) + mtspr SPRN_DBCR2, r8 + mtspr SPRN_DBCR4, r9 + mtspr SPRN_IAC1, r7 + mtspr SPRN_IAC2, r3 +#if CONFIG_PPC_ADV_DEBUG_IACS > 2 + PPC_LD(r7, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC3, r4) + PPC_LD(r8, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC4, r4) + mtspr SPRN_IAC3, r7 + mtspr SPRN_IAC4, r8 +#endif + PPC_LD(r7, VCPU_SHADOW_DBG+KVMPPC_DBG_DAC1, r4) + PPC_LD(r8, VCPU_SHADOW_DBG+KVMPPC_DBG_DAC2, r4) + mtspr SPRN_DAC1, r7 + mtspr SPRN_DAC2, r8 +skip_hw_bkpts: + /* Set EPCR.DUVD and guest DBCR0 */ + mfspr r7, SPRN_EPCR + oris r7, r7, SPRN_EPCR_DUVD@h + mtspr SPRN_EPCR, r7 + isync + /* Clear if any deferred debug event */ + mfspr r8, SPRN_DBSR + mtspr SPRN_DBSR, r8 + isync + /* Restore guest DBCR */ + mtspr SPRN_DBCR0, r6 + isync +skip_load_guest_debug: + /* Load some guest volatiles. */ PPC_LL r3, VCPU_LR(r4) PPC_LL r5, VCPU_XER(r4) diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c index 1f89d26..f5fc6f5 100644 --- a/arch/powerpc/kvm/e500mc.c +++ b/arch/powerpc/kvm/e500mc.c @@ -182,8 +182,7 @@ int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \ - SPRN_EPCR_DUVD; + vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI; #ifdef CONFIG_64BIT vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM; #endif