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Wed, 26 Jun 2024 06:58:02 -0700 (PDT) From: George Dunlap To: xen-devel@lists.xenproject.org Cc: George Dunlap Subject: [PATCH WIP 03/14] xenalyze: Basic nested virt processing Date: Wed, 26 Jun 2024 14:38:42 +0100 Message-Id: <20240626133853.4150731-4-george.dunlap@cloud.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240626133853.4150731-1-george.dunlap@cloud.com> References: <20240626133853.4150731-1-george.dunlap@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1719410307012100007 Content-Type: text/plain; charset="utf-8" On SVM, VMEXIT that occur in when an L1 is in non-root mode ("nested exits") are tagged with the TRC_HVM_NESTEDFLAG flag. Expand xenalyze to do basic handling of these records: - Refactor hvm_process to filter out both TRC_HVM_NESTEDFLAG and TRC_64_FLAG when deciding how to process - Create separate "trace volume" sub-categories for them (HVM_VOL_*), tweaking layout so things continue to align - Visually distinquish nested from non-nested vmexits and vmentries in dump mode At the moment, nested VMEXITs which are passed through to the L1 hypervisor won't have any HVM handlers; note in hvm_data when a vmexit was nested, and don't warn when no handlers occur. While here: - Expand one of the error messages with a bit more information - Replace repeated `ri->event & TRC_64_FLAG` instances with `flag64` - Remove a stray whitespace at the end of a line - Add a missing newline to a warning statement Signed-off-by: George Dunlap --- tools/xentrace/xenalyze.c | 66 ++++++++++++++++++++++++++------------- 1 file changed, 45 insertions(+), 21 deletions(-) diff --git a/tools/xentrace/xenalyze.c b/tools/xentrace/xenalyze.c index d95e52695f..52ee7a5f9f 100644 --- a/tools/xentrace/xenalyze.c +++ b/tools/xentrace/xenalyze.c @@ -986,7 +986,9 @@ const char * hvm_event_handler_name[HVM_EVENT_HANDLER_M= AX] =3D { =20 enum { HVM_VOL_VMENTRY, + HVM_VOL_VMENTRY_NESTED, HVM_VOL_VMEXIT, + HVM_VOL_VMEXIT_NESTED, HVM_VOL_HANDLER, HVM_VOL_EMUL, HVM_VOL_MAX @@ -1014,6 +1016,8 @@ const char *guest_interrupt_case_name[] =3D { const char *hvm_vol_name[HVM_VOL_MAX] =3D { [HVM_VOL_VMENTRY]=3D"vmentry", [HVM_VOL_VMEXIT] =3D"vmexit", + [HVM_VOL_VMENTRY_NESTED]=3D"vmentry(n)", + [HVM_VOL_VMEXIT_NESTED] =3D"vmexit(n)", [HVM_VOL_HANDLER]=3D"handler", [HVM_VOL_EMUL]=3D"emul", }; @@ -1380,7 +1384,7 @@ struct hvm_data { tsc_t exit_tsc, arc_cycles, entry_tsc; unsigned long long rip; unsigned exit_reason, event_handler; - unsigned int short_summary_done:1, prealloc_unpin:1, wrmap_bf:1; + bool nested_vmexit, short_summary_done, prealloc_unpin, wrmap_bf; =20 /* Immediate processing */ void *d; @@ -1807,7 +1811,7 @@ void volume_summary(struct trace_volume *vol) case TOPLEVEL_HVM: for(k=3D0; khvm[k]) - printf(" +-%-7s: %10lld\n", + printf(" +-%-10s: %10lld\n", hvm_vol_name[k], vol->hvm[k]); } =20 @@ -4633,6 +4637,9 @@ void hvm_generic_postprocess(struct hvm_data *h) /* Some exits we don't expect a handler; just return */ if(opt.svm_mode) { + /* Nested vmexits passed on to L1's have no handlers for now */ + if(h->nested_vmexit) + return; switch(h->exit_reason) { case VMEXIT_VINTR: /* Equivalent of PENDING_VIRT_INTR */ @@ -4660,8 +4667,10 @@ void hvm_generic_postprocess(struct hvm_data *h) if ( !warned[h->exit_reason] ) { /* If we aren't a known exception, warn and log results */ - fprintf(warn, "%s: Strange, exit %x(%s) missing a handler\n", - __func__, h->exit_reason, + fprintf(warn, "%s: d%dv%d Strange, exit %x(%s) missing a handl= er\n", + __func__, + h->v->d->did, h->v->vid, + h->exit_reason, (h->exit_reason > h->exit_reason_max) ? "[clipped]" : h->exit_reason_name[h->exit_reason]); @@ -5067,6 +5076,9 @@ static inline void runstate_update(struct vcpu_data *= v, int new_runstate, =20 void hvm_vmexit_process(struct record_info *ri, struct hvm_data *h, struct vcpu_data *v) { + bool flag64 =3D ri->event & TRC_64_FLAG; + bool nested =3D ri->event & TRC_HVM_NESTEDFLAG; + struct { union { struct { @@ -5080,7 +5092,7 @@ void hvm_vmexit_process(struct record_info *ri, struc= t hvm_data *h, }; } *r; =20 - if ( ri->event & TRC_64_FLAG ) + if(flag64) { if (check_extra_words(ri, sizeof(r->x64), "vmexit")) return; @@ -5097,9 +5109,10 @@ void hvm_vmexit_process(struct record_info *ri, stru= ct hvm_data *h, set_hvm_exit_reason_data(h, ri->event); =20 h->vmexit_valid=3D1; + h->nested_vmexit=3Dnested; bzero(&h->inflight, sizeof(h->inflight)); =20 - if(ri->event & TRC_64_FLAG) { + if(flag64) { if(v->guest_paging_levels !=3D 4) { if ( verbosity >=3D 6 ) @@ -5145,14 +5158,16 @@ void hvm_vmexit_process(struct record_info *ri, str= uct hvm_data *h, if(opt.dump_all) { if ( h->exit_reason < h->exit_reason_max && h->exit_reason_name[h->exit_reason] !=3D NULL) - printf("]%s vmexit exit_reason %s eip %llx%s\n", + printf("]%s vmexit%s exit_reason %s eip %llx%s\n", ri->dump_header, + nested ? "(n)" : "", h->exit_reason_name[h->exit_reason], h->rip, find_symbol(h->rip)); else - printf("]%s vmexit exit_reason %x eip %llx%s\n", + printf("]%s vmexit%s exit_reason %x eip %llx%s\n", ri->dump_header, + nested ? "(n)" : "", h->exit_reason, h->rip, find_symbol(h->rip)); @@ -5244,11 +5259,13 @@ void hvm_close_vmexit(struct hvm_data *h, tsc_t tsc= ) { } =20 void hvm_vmentry_process(struct record_info *ri, struct hvm_data *h) { + bool nested =3D ri->event & TRC_HVM_NESTEDFLAG; if(!h->init) { if(opt.dump_all) - printf("!%s vmentry\n", - ri->dump_header); + printf("!%s vmentry%s\n", + ri->dump_header, + nested ? "(n)" : ""); return; } =20 @@ -5283,15 +5300,18 @@ void hvm_vmentry_process(struct record_info *ri, st= ruct hvm_data *h) { if(!h->vmexit_valid) { if(opt.dump_all) - printf("!%s vmentry\n", - ri->dump_header); + printf("!%s vmentry%s\n", + ri->dump_header, + nested ? "(n)" : ""); return; } =20 if(opt.dump_all) { unsigned long long arc_cycles =3D ri->tsc - h->exit_tsc; - printf("]%s vmentry cycles %lld %s\n", - ri->dump_header, arc_cycles, (arc_cycles>10000)?"!":""); + printf("]%s vmentry%s cycles %lld %s\n", + ri->dump_header, + nested ? "(n)" : "", + arc_cycles, (arc_cycles>10000)?"!":""); } =20 hvm_close_vmexit(h, ri->tsc); @@ -5323,16 +5343,20 @@ void hvm_process(struct pcpu_info *p) /* FIXME: Collect analysis on this */ break; default: - switch(ri->event) { + switch(ri->event & ~(TRC_HVM_NESTEDFLAG|TRC_64_FLAG)) { case TRC_HVM_VMX_EXIT: - case TRC_HVM_VMX_EXIT64: case TRC_HVM_SVM_EXIT: - case TRC_HVM_SVM_EXIT64: - UPDATE_VOLUME(p, hvm[HVM_VOL_VMEXIT], ri->size); + if (ri->event & TRC_HVM_NESTEDFLAG) + UPDATE_VOLUME(p, hvm[HVM_VOL_VMEXIT_NESTED], ri->size); + else + UPDATE_VOLUME(p, hvm[HVM_VOL_VMEXIT], ri->size); hvm_vmexit_process(ri, h, v); break; case TRC_HVM_VMENTRY: - UPDATE_VOLUME(p, hvm[HVM_VOL_VMENTRY], ri->size); + if (ri->event & TRC_HVM_NESTEDFLAG) + UPDATE_VOLUME(p, hvm[HVM_VOL_VMENTRY_NESTED], ri->size); + else + UPDATE_VOLUME(p, hvm[HVM_VOL_VMENTRY], ri->size); hvm_vmentry_process(ri, &p->current->hvm); break; default: @@ -6977,7 +7001,7 @@ void vcpu_start(struct pcpu_info *p, struct vcpu_data= *v, /* Change default domain to 'queued' */ runstate_update(p->current, RUNSTATE_QUEUED, p->first_tsc); =20 - /*=20 + /* * Set current to NULL, so that if another vcpu (not in INIT) * is scheduled here, we don't trip over the check in * vcpu_next_update() @@ -6997,7 +7021,7 @@ void vcpu_start(struct pcpu_info *p, struct vcpu_data= *v, =20 return; } else if ( v->delayed_init ) { - fprintf(warn, "d%dv%d RUNSTATE_RUNNING detected, leaving INIT", + fprintf(warn, "d%dv%d RUNSTATE_RUNNING detected, leaving INIT\n", v->d->did, v->vid); v->delayed_init =3D 0; } --=20 2.25.1