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d="scan'208";a="52955352" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Stefano Stabellini , Wei Liu , Julien Grall , Dario Faggioli Subject: [PATCH 2/6] xen/memory: Remove tail padding from TRC_MEM_* records Date: Fri, 17 Sep 2021 09:45:55 +0100 Message-ID: <20210917084559.22673-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210917084559.22673-1-andrew.cooper3@citrix.com> References: <20210917084559.22673-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain Four TRC_MEM_* records supply custom structures with tail padding, leaking stack rubble into the trace buffer. Three of the records were fine in 32-bit builds of Xen, due to the relaxed alignment of 64-bit integers, but POD_SUPERPAGE_SPLITER was broken right from the outset. We could pack the datastructures to remove the padding, but xentrace_format has no way of rendering the upper half of a 16-bit field. Instead, expand all 16-bit fields to 32-bit. For POD_SUPERPAGE_SPLINTER, introduce an order field as it is relevant information, and to matche DECREASE_RESERVATION, and so it doesn't require a __packed attribute to drop tail padding. Update xenalyze's structures to match, and introduce xentrace_format rendering which was absent previously. Signed-off-by: Andrew Cooper --- CC: George Dunlap CC: Ian Jackson CC: Jan Beulich CC: Stefano Stabellini CC: Wei Liu CC: Julien Grall CC: Dario Faggioli The xentrace_format script isn't remotely Py3 compatible, and was another script missed by our previous efforts. --- tools/xentrace/formats | 4 ++++ tools/xentrace/xenalyze.c | 12 ++++++------ xen/arch/x86/mm/p2m-pod.c | 17 +++++++++-------- xen/common/memory.c | 4 ++-- 4 files changed, 21 insertions(+), 16 deletions(-) diff --git a/tools/xentrace/formats b/tools/xentrace/formats index deac4d8598b0..0fcc327a4078 100644 --- a/tools/xentrace/formats +++ b/tools/xentrace/formats @@ -136,6 +136,10 @@ 0x0010f001 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) page_grant_map [ domid = %(1)d ] 0x0010f002 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) page_grant_unmap [ domid = %(1)d ] 0x0010f003 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) page_grant_transfer [ domid = %(1)d ] +0x0010f005 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) decrease_reservation [ d%(3)d gfn 0x%(2)08x%(1)08x, order %(4)u ] +0x0010f010 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) pod_populate [ d%(5)d gfn 0x%(2)08x%(1)08x => mfn 0x%(4)08x%(3)08x, order %(6)u ] +0x0010f011 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) pod_zero_reclaim [ d%(5)d gfn 0x%(2)08x%(1)08x => mfn 0x%(4)08x%(3)08x, order %(6)u ] +0x0010f012 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) pod_superpage_splinter [ d%(3)d gfn 0x%(2)08x%(1)08x, order %(4)u ] 0x00201001 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) hypercall [ eip = 0x%(1)08x, eax = 0x%(2)08x ] 0x00201101 CPU%(cpu)d %(tsc)d (+%(reltsc)8d) hypercall [ rip = 0x%(2)08x%(1)08x, eax = 0x%(3)08x ] diff --git a/tools/xentrace/xenalyze.c b/tools/xentrace/xenalyze.c index 5de167031e01..12dcca964645 100644 --- a/tools/xentrace/xenalyze.c +++ b/tools/xentrace/xenalyze.c @@ -8121,7 +8121,7 @@ void mem_pod_zero_reclaim_process(struct pcpu_info *p) struct { uint64_t gfn, mfn; - int d:16,order:16; + uint32_t d, order; } *r = (typeof(r))ri->d; if ( v && v->hvm.vmexit_valid ) @@ -8171,7 +8171,7 @@ void mem_pod_populate_process(struct pcpu_info *p) struct { uint64_t gfn, mfn; - int d:16,order:16; + uint32_t d, order; } *r = (typeof(r))ri->d; if ( opt.dump_all ) @@ -8204,14 +8204,14 @@ void mem_pod_superpage_splinter_process(struct pcpu_info *p) struct { uint64_t gfn; - int d:16; + uint32_t d, order; } *r = (typeof(r))ri->d; if ( opt.dump_all ) { - printf(" %s pod_spage_splinter d%d g %llx\n", + printf(" %s pod_spage_splinter d%d o%d g %"PRIx64"\n", ri->dump_header, - r->d, (unsigned long long)r->gfn); + r->d, r->order, r->gfn); } } @@ -8255,7 +8255,7 @@ void mem_decrease_reservation_process(struct pcpu_info *p) struct { uint64_t gfn; - int d:16,order:16; + uint32_t d, order; } *r = (typeof(r))ri->d; if ( opt.dump_all ) diff --git a/xen/arch/x86/mm/p2m-pod.c b/xen/arch/x86/mm/p2m-pod.c index 8abc57265c10..90f02ae765f6 100644 --- a/xen/arch/x86/mm/p2m-pod.c +++ b/xen/arch/x86/mm/p2m-pod.c @@ -819,8 +819,8 @@ p2m_pod_zero_check_superpage(struct p2m_domain *p2m, gfn_t gfn) if ( tb_init_done ) { struct { - u64 gfn, mfn; - int d:16,order:16; + uint64_t gfn, mfn; + uint32_t d, order; } t; t.gfn = gfn_x(gfn); @@ -987,8 +987,8 @@ p2m_pod_zero_check(struct p2m_domain *p2m, const gfn_t *gfns, unsigned int count if ( tb_init_done ) { struct { - u64 gfn, mfn; - int d:16,order:16; + uint64_t gfn, mfn; + uint32_t d, order; } t; t.gfn = gfn_x(gfns[i]); @@ -1217,8 +1217,8 @@ p2m_pod_demand_populate(struct p2m_domain *p2m, gfn_t gfn, if ( tb_init_done ) { struct { - u64 gfn, mfn; - int d:16,order:16; + uint64_t gfn, mfn; + uint32_t d, order; } t; t.gfn = gfn_x(gfn); @@ -1260,12 +1260,13 @@ p2m_pod_demand_populate(struct p2m_domain *p2m, gfn_t gfn, if ( tb_init_done ) { struct { - u64 gfn; - int d:16; + uint64_t gfn; + uint32_t d, order; } t; t.gfn = gfn_x(gfn); t.d = d->domain_id; + t.order = order; __trace_var(TRC_MEM_POD_SUPERPAGE_SPLINTER, 0, sizeof(t), &t); } diff --git a/xen/common/memory.c b/xen/common/memory.c index 63642278fda9..8fd88ccb70bf 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -450,8 +450,8 @@ static void decrease_reservation(struct memop_args *a) if ( tb_init_done ) { struct { - u64 gfn; - int d:16,order:16; + uint64_t gfn; + uint32_t d, order; } t; t.gfn = gmfn; -- 2.11.0