On 16.01.2013, at 09:24, Bharat Bhushan wrote:
> 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 <bharat.bhushan@xxxxxxxxxxxxx>
> ---
> arch/powerpc/include/asm/kvm_host.h | 5 +
> arch/powerpc/include/asm/kvm_ppc.h | 2 +
> arch/powerpc/include/uapi/asm/kvm.h | 22 ++++-
> arch/powerpc/kernel/asm-offsets.c | 26 ++++++
> arch/powerpc/kvm/booke.c | 124 +++++++++++++++++++++++++----
> arch/powerpc/kvm/booke_interrupts.S | 114 ++++++++++++++++++++++++++
> arch/powerpc/kvm/bookehv_interrupts.S | 145 ++++++++++++++++++++++++++++++++-
> arch/powerpc/kvm/e500_emulate.c | 6 ++
> arch/powerpc/kvm/e500mc.c | 3 +-
> 9 files changed, 422 insertions(+), 25 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index f4ba881..a9feeb0 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -504,7 +504,12 @@ 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/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
> index b3c481e..e4b3398 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -45,6 +45,8 @@ enum emulation_result {
> EMULATE_FAIL, /* can't emulate this instruction */
> EMULATE_AGAIN, /* something went wrong. go again */
> EMULATE_DO_PAPR, /* kvm_run filled with PAPR request */
> + EMULATE_DEBUG_INST, /* debug instruction for software
> + breakpoint, exit to userspace */
Does this do something different from DO_PAPR? Maybe it makes sense to have an exit code EMULATE_EXIT_USER?
> };
>
> extern int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
> diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
> index e8842ed..a81ab29 100644
> --- a/arch/powerpc/include/uapi/asm/kvm.h
> +++ b/arch/powerpc/include/uapi/asm/kvm.h
> @@ -25,6 +25,7 @@
> /* Select powerpc specific features in <linux/kvm.h> */
> #define __KVM_HAVE_SPAPR_TCE
> #define __KVM_HAVE_PPC_SMT
> +#define __KVM_HAVE_GUEST_DEBUG
>
> struct kvm_regs {
> __u64 pc;
> @@ -267,7 +268,24 @@ 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 address;
> + /*
> + * exiting to userspace because of h/w breakpoint, watchpoint
> + * (read, write or both) and software breakpoint.
> + */
> + __u32 status;
> + __u32 reserved;
> };
>
> /* for KVM_SET_GUEST_DEBUG */
> @@ -279,10 +297,6 @@ 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 reserved;
> } bp[16];
> diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
> index 02048f3..22deda7 100644
> --- a/arch/powerpc/kernel/asm-offsets.c
> +++ b/arch/powerpc/kernel/asm-offsets.c
> @@ -563,6 +563,32 @@ 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 7d5a51c..faa0a0b 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -143,6 +143,9 @@ 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;
> @@ -711,7 +714,8 @@ 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)
Why pass in exit_nr?
> {
> enum emulation_result er;
>
> @@ -728,6 +732,13 @@ static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
> run->exit_reason = KVM_EXIT_DCR;
> return RESUME_HOST;
>
> + case EMULATE_DEBUG_INST:
> + run->exit_reason = KVM_EXIT_DEBUG;
> + run->debug.arch.address = vcpu->arch.pc;
> + run->debug.arch.status = 0;
> + kvmppc_account_exit(vcpu, DEBUG_EXITS);
> + return RESUME_HOST;
> +
> case EMULATE_FAIL:
> printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
> __func__, vcpu->arch.pc, vcpu->arch.last_inst);
> @@ -743,6 +754,28 @@ static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
> }
> }
>
> +static int kvmppc_handle_debug(struct kvm_run *run, struct kvm_vcpu *vcpu)
> +{
> + u32 dbsr = vcpu->arch.dbsr;
> + run->debug.arch.status = 0;
> + run->debug.arch.address = vcpu->arch.pc;
> +
> + 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.address = vcpu->arch.shadow_dbg_reg.dac[0];
> + else if (dbsr & (DBSR_DAC2R | DBSR_DAC2W))
> + run->debug.arch.address = vcpu->arch.shadow_dbg_reg.dac[1];
> + }
> +
> + return RESUME_HOST;
> +}
> +
> static void kvmppc_fill_pt_regs(struct pt_regs *regs)
> {
> ulong r1, ip, msr, lr;
> @@ -887,7 +920,7 @@ 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:
> @@ -906,7 +939,7 @@ 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:
> @@ -1096,18 +1129,11 @@ 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->exit_reason = KVM_EXIT_DEBUG;
> + }
> kvmppc_account_exit(vcpu, DEBUG_EXITS);
> - r = RESUME_HOST;
> break;
> }
>
> @@ -1483,10 +1509,78 @@ 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
Please reverse the logic here. #ifndef ... #else is always a bad idea.
> + 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;
> }
I'll stop reviewing here. This patch is way too big. Please split it up in smaller, understandable bits.
Alex
>
> 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..734c549 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<<BOOKE_INTERRUPT_PROGRAM) | \
> (1<<BOOKE_INTERRUPT_DTLB_MISS) | \
> @@ -52,6 +54,8 @@
> (1<<BOOKE_INTERRUPT_PROGRAM) | \
> (1<<BOOKE_INTERRUPT_DTLB_MISS))
>
> +#define NEED_DEBUG_SAVE (1<<BOOKE_INTERRUPT_DEBUG)
> +
> .macro __KVM_HANDLER ivor_nr scratch srr0
> stw r3, VCPU_GPR(R3)(r4)
> stw r5, VCPU_GPR(R5)(r4)
> @@ -212,6 +216,59 @@ _GLOBAL(kvmppc_resume_host)
> stw r9, VCPU_FAULT_ESR(r4)
> ..skip_esr:
>
> + lwz r9, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR0(r4)
> + rlwinm. r8, r9, 0, ~DBCR0_IDM
> + beq skip_load_host_debug
> + lwz r8, VCPU_HOST_DBG+KVMPPC_DBG_DBCR0(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 r9, VCPU_HOST_DBG+KVMPPC_DBG_DBCR2(r4)
> + mtspr SPRN_DBCR1, r7
> + mtspr SPRN_DBCR2, r9
> + PPC_LD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC1, r4)
> + PPC_LD(r9, VCPU_HOST_DBG+KVMPPC_DBG_IAC2, r4)
> + mtspr SPRN_IAC1, r7
> + mtspr SPRN_IAC2, r9
> +#if CONFIG_PPC_ADV_DEBUG_IACS > 2
> + PPC_LD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC3, r4)
> + PPC_LD(r9, VCPU_HOST_DBG+KVMPPC_DBG_IAC4, r4)
> + mtspr SPRN_IAC3, r3
> + mtspr SPRN_IAC4, r4
> +#endif
> + PPC_LD(r7, VCPU_HOST_DBG+KVMPPC_DBG_DAC1, r4)
> + PPC_LD(r9, VCPU_HOST_DBG+KVMPPC_DBG_DAC2, r4)
> + mtspr SPRN_DAC1, r7
> + mtspr SPRN_DAC2, r9
> +skip_load_hw_bkpts:
> + /* 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)
> + PPC_LD(r3, VCPU_SHARED_MSR, r3)
> + 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
> +skip_load_host_debug:
> +
> /* Save remaining volatile guest register state to vcpu. */
> stw r0, VCPU_GPR(R0)(r4)
> stw r1, VCPU_GPR(R1)(r4)
> @@ -465,6 +522,63 @@ lightweight_exit:
> PPC_LD(r3, VCPU_SHARED_SPRG7, r5)
> mtspr SPRN_SPRG7W, r3
>
> + mfmsr r7
> + rlwinm r7, r7, 0, ~MSR_DE
> + mtmsr r7
> + lwz r6, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR0(r4)
> + rlwinm. r7, r6, 0, ~DBCR0_IDM
> + beq skip_load_guest_debug
> + mfspr r8, SPRN_DBCR0
> + stw r8, VCPU_HOST_DBG+KVMPPC_DBG_DBCR0(r4)
> + 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_IAC1
> + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC1, r4)
> + mfspr r8, SPRN_IAC2
> + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_IAC2, r4)
> +#if CONFIG_PPC_ADV_DEBUG_IACS > 2
> + mfspr r7, SPRN_IAC3
> + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_IAC3, r4)
> + mfspr r8, SPRN_IAC4
> + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_IAC4, r4)
> +#endif
> + mfspr r7, SPRN_DAC1
> + PPC_STD(r7, VCPU_HOST_DBG+KVMPPC_DBG_DAC1, r4)
> + mfspr r8, SPRN_DAC2
> + PPC_STD(r8, VCPU_HOST_DBG+KVMPPC_DBG_DAC2, r4)
> + li r8, 0
> + mtspr SPRN_DBCR0, r8 /* disable all debug event */
> + PPC_LD(r7, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR1, r4)
> + PPC_LD(r8, VCPU_SHADOW_DBG+KVMPPC_DBG_DBCR2, r4)
> + mtspr SPRN_DBCR1, r7
> + mtspr SPRN_DBCR2, r8
> + PPC_LD(r7, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC1, r4)
> + PPC_LD(r8, VCPU_SHADOW_DBG+KVMPPC_DBG_IAC2, r4)
> + mtspr SPRN_IAC1, r7
> + mtspr SPRN_IAC2, r8
> +#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:
> + /* Clear if any deferred debug event */
> + mfspr r8, SPRN_DBSR
> + mtspr SPRN_DBSR, r8
> + isync
> + /* Restore guest DBCR */
> + mtspr SPRN_DBCR0, r6
> +skip_load_guest_debug:
> +
> #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 e8ed7d6..0d830cc 100644
> --- a/arch/powerpc/kvm/bookehv_interrupts.S
> +++ b/arch/powerpc/kvm/bookehv_interrupts.S
> @@ -62,6 +62,10 @@
> #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:
> @@ -201,6 +205,11 @@
> 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
>
> @@ -316,9 +325,9 @@ kvm_handler BOOKE_INTERRUPT_GUEST_DBELL, EX_PARAMS(GDBELL), \
> kvm_handler BOOKE_INTERRUPT_GUEST_DBELL_CRIT, EX_PARAMS(CRIT), \
> SPRN_CSRR0, SPRN_CSRR1, 0
> kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(DBG), \
> - SPRN_DSRR0, SPRN_DSRR1, 0
> + SPRN_DSRR0, SPRN_DSRR1, NEED_DBSR
> kvm_handler BOOKE_INTERRUPT_DEBUG, EX_PARAMS(CRIT), \
> - SPRN_CSRR0, SPRN_CSRR1, 0
> + SPRN_CSRR0, SPRN_CSRR1, NEED_DBSR
> #else
> /*
> * For input register values, see arch/powerpc/include/asm/kvm_booke_hv_asm.h
> @@ -411,9 +420,9 @@ 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
> #endif
>
> /* Registers:
> @@ -423,6 +432,56 @@ 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+KVMPPC_DBG_DBCR0(r4)
> + rlwinm. r8, r9, 0, ~DBCR0_IDM
> + beq skip_load_host_debug
> + lwz r3, VCPU_HOST_DBG+KVMPPC_DBG_DBCR0(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 */
> + 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)
> @@ -662,6 +721,84 @@ 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+KVMPPC_DBG_DBCR0(r4)
> + rlwinm. r7, r6, 0, ~DBCR0_IDM
> + beq skip_load_guest_debug
> + /* Save host DBCR0 */
> + mfspr r8, SPRN_DBCR0
> + stw r8, VCPU_HOST_DBG+KVMPPC_DBG_DBCR0(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/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
> index e78f353..ddb903e 100644
> --- a/arch/powerpc/kvm/e500_emulate.c
> +++ b/arch/powerpc/kvm/e500_emulate.c
> @@ -26,6 +26,7 @@
> #define XOP_TLBRE 946
> #define XOP_TLBWE 978
> #define XOP_TLBILX 18
> +#define XOP_EHPRIV 270
>
> #ifdef CONFIG_KVM_E500MC
> static int dbell2prio(ulong param)
> @@ -130,6 +131,11 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
> emulated = kvmppc_e500_emul_tlbivax(vcpu, ea);
> break;
>
> + case XOP_EHPRIV:
> + emulated = EMULATE_DEBUG_INST;
> + *advance = 0;
> + break;
> +
> default:
> emulated = EMULATE_FAIL;
> }
> diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
> index dead142..81abe92 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
> --
> 1.7.0.4
>
>
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