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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-ia64-devel] PATCH: implements ibr/dbr virtualization for PV
Hi tristan.
Is the flag, IA64_THREAD_DBG_VALID, set-only and never-cleared?
Can it be cleared when dbr[odd].{r, w} = 0 or ibr[odd].x = 0?
thanks,
On Tue, Jun 26, 2007 at 04:30:17AM +0200, tgingold@xxxxxxx wrote:
> Hi,
>
> this patch virtualize ibr and dbr for PV.
>
> Setting an hardware breakpoints now works (at least for domain debugging).
>
> Tristan.
> # HG changeset patch
> # User Tristan Gingold <tgingold@xxxxxxx>
> # Date 1182824870 -7200
> # Node ID b73d2d95ff151b92ce2796662601ab60b1de63be
> # Parent dddbacf2e2f5532a4cf73a03066d13e0b52d36c5
> Implement get/set i/dbr for PV.
>
> Signed-off-by: Tristan Gingold <tgingold@xxxxxxx>
>
> diff -r dddbacf2e2f5 -r b73d2d95ff15 xen/arch/ia64/xen/domain.c
> --- a/xen/arch/ia64/xen/domain.c Sun Jun 24 05:21:41 2007 +0200
> +++ b/xen/arch/ia64/xen/domain.c Tue Jun 26 04:27:50 2007 +0200
> @@ -237,6 +237,13 @@ void context_switch(struct vcpu *prev, s
> ia64_disable_vhpt_walker();
> lazy_fp_switch(prev, current);
>
> + if ((prev->arch._thread.flags & IA64_THREAD_DBG_VALID)
> + || (next->arch._thread.flags & IA64_THREAD_DBG_VALID)) {
> + /* Load debug registers either because they are valid or to clear
> + the previous one. */
> + ia64_load_debug_regs (next->arch._thread.dbr);
> + }
> +
> prev = ia64_switch_to(next);
>
> /* Note: ia64_switch_to does not return here at vcpu initialization. */
> @@ -693,6 +700,14 @@ void arch_get_info_guest(struct vcpu *v,
> c.nat->privregs_pfn = get_gpfn_from_mfn
> (virt_to_maddr(v->arch.privregs) >> PAGE_SHIFT);
>
> + for (i = 0; i < IA64_NUM_DBG_REGS; i++) {
> + vcpu_get_dbr (v, i, &c.nat->regs.dbr[i]);
> + vcpu_get_ibr (v, i, &c.nat->regs.ibr[i]);
> + }
> +
> + for (i = 0; i < 7; i++)
> + vcpu_get_rr (v, (unsigned long)i << 61, &c.nat->regs.rr[i]);
> +
> /* Fill extra regs. */
> for (i = 0; i < 8; i++) {
> tr->itrs[i].pte = v->arch.itrs[i].pte.val;
> @@ -723,6 +738,7 @@ int arch_set_info_guest(struct vcpu *v,
> int was_initialised = v->is_initialised;
> unsigned int rbs_size;
> int rc;
> + int i;
>
> /* Finish vcpu initialization. */
> if (!was_initialised) {
> @@ -828,8 +844,12 @@ int arch_set_info_guest(struct vcpu *v,
> uregs->ar_rsc |= (2 << 2); /* force PL2/3 */
> }
>
> + for (i = 0; i < IA64_NUM_DBG_REGS; i++) {
> + vcpu_set_dbr (v, i, c.nat->regs.dbr[i]);
> + vcpu_set_ibr (v, i, c.nat->regs.ibr[i]);
> + }
> +
> if (c.nat->flags & VGCF_EXTRA_REGS) {
> - int i;
> struct vcpu_tr_regs *tr = &c.nat->regs.tr;
>
> for (i = 0; i < 8; i++) {
> diff -r dddbacf2e2f5 -r b73d2d95ff15 xen/arch/ia64/xen/ivt.S
> --- a/xen/arch/ia64/xen/ivt.S Sun Jun 24 05:21:41 2007 +0200
> +++ b/xen/arch/ia64/xen/ivt.S Tue Jun 26 04:27:50 2007 +0200
> @@ -1183,11 +1183,7 @@ END(speculation_vector)
> // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
> ENTRY(debug_vector)
> DBG_FAULT(29)
> -#ifdef XEN
> FAULT_OR_REFLECT(29)
> -#else
> - FAULT(29)
> -#endif
> END(debug_vector)
>
> .org ia64_ivt+0x5a00
> diff -r dddbacf2e2f5 -r b73d2d95ff15 xen/arch/ia64/xen/vcpu.c
> --- a/xen/arch/ia64/xen/vcpu.c Sun Jun 24 05:21:41 2007 +0200
> +++ b/xen/arch/ia64/xen/vcpu.c Tue Jun 26 04:27:50 2007 +0200
> @@ -1773,33 +1773,61 @@ IA64FAULT vcpu_tak(VCPU * vcpu, u64 vadr
>
> IA64FAULT vcpu_set_dbr(VCPU * vcpu, u64 reg, u64 val)
> {
> - // TODO: unimplemented DBRs return a reserved register fault
> - // TODO: Should set Logical CPU state, not just physical
> - ia64_set_dbr(reg, val);
> + if (reg >= IA64_NUM_DBG_REGS)
> + return IA64_RSVDREG_FAULT;
> + if ((reg & 1) == 0) {
> + /* Validate address. */
> + if (val >= HYPERVISOR_VIRT_START && val <= HYPERVISOR_VIRT_END)
> + return IA64_ILLOP_FAULT;
> + }
> + else {
> + /* Mask PL0. */
> + val &= ~(1UL << 56);
> + }
> + if (val != 0) {
> + vcpu->arch._thread.flags |= IA64_THREAD_DBG_VALID;
> + }
> + vcpu->arch._thread.dbr[reg] = val;
> + if (vcpu == current)
> + ia64_set_dbr(reg, val);
> return IA64_NO_FAULT;
> }
>
> IA64FAULT vcpu_set_ibr(VCPU * vcpu, u64 reg, u64 val)
> {
> - // TODO: unimplemented IBRs return a reserved register fault
> - // TODO: Should set Logical CPU state, not just physical
> - ia64_set_ibr(reg, val);
> + if (reg >= IA64_NUM_DBG_REGS)
> + return IA64_RSVDREG_FAULT;
> + if ((reg & 1) == 0) {
> + /* Validate address. */
> + if (val >= HYPERVISOR_VIRT_START && val <= HYPERVISOR_VIRT_END)
> + return IA64_ILLOP_FAULT;
> + }
> + else {
> + /* Mask PL0. */
> + val &= ~(1UL << 56);
> + }
> + if (val != 0) {
> + vcpu->arch._thread.flags |= IA64_THREAD_DBG_VALID;
> + }
> + vcpu->arch._thread.ibr[reg] = val;
> + if (vcpu == current)
> + ia64_set_ibr(reg, val);
> return IA64_NO_FAULT;
> }
>
> IA64FAULT vcpu_get_dbr(VCPU * vcpu, u64 reg, u64 * pval)
> {
> - // TODO: unimplemented DBRs return a reserved register fault
> - u64 val = ia64_get_dbr(reg);
> - *pval = val;
> + if (reg >= IA64_NUM_DBG_REGS)
> + return IA64_RSVDREG_FAULT;
> + *pval = vcpu->arch._thread.dbr[reg];
> return IA64_NO_FAULT;
> }
>
> IA64FAULT vcpu_get_ibr(VCPU * vcpu, u64 reg, u64 * pval)
> {
> - // TODO: unimplemented IBRs return a reserved register fault
> - u64 val = ia64_get_ibr(reg);
> - *pval = val;
> + if (reg >= IA64_NUM_DBG_REGS)
> + return IA64_RSVDREG_FAULT;
> + *pval = vcpu->arch._thread.ibr[reg];
> return IA64_NO_FAULT;
> }
>
> @@ -2002,8 +2030,8 @@ IA64FAULT vcpu_set_rr(VCPU * vcpu, u64 r
> IA64FAULT vcpu_set_rr(VCPU * vcpu, u64 reg, u64 val)
> {
> PSCB(vcpu, rrs)[reg >> 61] = val;
> - // warning: set_one_rr() does it "live"
> - set_one_rr(reg, val);
> + if (vcpu == current)
> + set_one_rr(reg, val);
> return IA64_NO_FAULT;
> }
>
> _______________________________________________
> Xen-ia64-devel mailing list
> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-ia64-devel
--
yamahata
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