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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] xentrace 5/7: Additional tracing for the shadow code.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1220885884 -3600
# Node ID 74621a2add541e2f6363f1627091bb5d5d5307f0
# Parent 8305efd067497dcd8bba608f1d4102113a795243
xentrace 5/7: Additional tracing for the shadow code.
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Signed-off-by: Trolle Selander <trolle.selander@xxxxxxxxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 4
xen/arch/x86/hvm/vmx/vmx.c | 13 +-
xen/arch/x86/mm/shadow/common.c | 63 ++++++++++-
xen/arch/x86/mm/shadow/multi.c | 208 ++++++++++++++++++++++++++++++++++++---
xen/arch/x86/mm/shadow/private.h | 43 ++++++++
xen/common/trace.c | 28 +++++
xen/include/public/trace.h | 17 +++
xen/include/xen/trace.h | 2
8 files changed, 353 insertions(+), 25 deletions(-)
diff -r 8305efd06749 -r 74621a2add54 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/arch/x86/hvm/svm/svm.c Mon Sep 08 15:58:04 2008 +0100
@@ -1261,7 +1261,9 @@ asmlinkage void svm_vmexit_handler(struc
if ( paging_fault(va, regs) )
{
- if (hvm_long_mode_enabled(v))
+ if ( trace_will_trace_event(TRC_SHADOW) )
+ break;
+ if ( hvm_long_mode_enabled(v) )
HVMTRACE_LONG_2D(PF_XEN, regs->error_code, TRC_PAR_LONG(va));
else
HVMTRACE_2D(PF_XEN, regs->error_code, va);
diff -r 8305efd06749 -r 74621a2add54 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Mon Sep 08 15:58:04 2008 +0100
@@ -2101,7 +2101,8 @@ asmlinkage void vmx_vmexit_handler(struc
!(__vmread(IDT_VECTORING_INFO) & INTR_INFO_VALID_MASK) &&
(vector != TRAP_double_fault) )
__vmwrite(GUEST_INTERRUPTIBILITY_INFO,
- __vmread(GUEST_INTERRUPTIBILITY_INFO)|VMX_INTR_SHADOW_NMI);
+ __vmread(GUEST_INTERRUPTIBILITY_INFO)
+ | VMX_INTR_SHADOW_NMI);
perfc_incra(cause_vector, vector);
@@ -2128,12 +2129,14 @@ asmlinkage void vmx_vmexit_handler(struc
if ( paging_fault(exit_qualification, regs) )
{
+ if ( trace_will_trace_event(TRC_SHADOW) )
+ break;
if ( hvm_long_mode_enabled(v) )
- HVMTRACE_LONG_2D (PF_XEN, regs->error_code,
- TRC_PAR_LONG(exit_qualification) );
+ HVMTRACE_LONG_2D(PF_XEN, regs->error_code,
+ TRC_PAR_LONG(exit_qualification) );
else
- HVMTRACE_2D (PF_XEN,
- regs->error_code, exit_qualification );
+ HVMTRACE_2D(PF_XEN,
+ regs->error_code, exit_qualification );
break;
}
diff -r 8305efd06749 -r 74621a2add54 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Mon Sep 08 15:58:04 2008 +0100
@@ -39,6 +39,7 @@
#include <xen/numa.h>
#include "private.h"
+DEFINE_PER_CPU(uint32_t,trace_shadow_path_flags);
/* Set up the shadow-specific parts of a domain struct at start of day.
* Called for every domain from arch_domain_create() */
@@ -630,6 +631,8 @@ void oos_fixup_add(struct vcpu *v, mfn_t
if ( mfn_x(oos_fixup[idx].smfn[next]) != INVALID_MFN )
{
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_OOS_FIXUP_EVICT);
+
/* Reuse this slot and remove current writable mapping. */
sh_remove_write_access_from_sl1p(v, gmfn,
oos_fixup[idx].smfn[next],
@@ -645,6 +648,8 @@ void oos_fixup_add(struct vcpu *v, mfn_t
oos_fixup[idx].smfn[next] = smfn;
oos_fixup[idx].off[next] = off;
oos_fixup[idx].next = (next + 1) % SHADOW_OOS_FIXUPS;
+
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_OOS_FIXUP_ADD);
return;
}
}
@@ -687,6 +692,16 @@ static int oos_remove_write_access(struc
}
+static inline void trace_resync(int event, mfn_t gmfn)
+{
+ if ( tb_init_done )
+ {
+ /* Convert gmfn to gfn */
+ unsigned long gfn = mfn_to_gfn(current->domain, gmfn);
+ __trace_var(event, 0/*!tsc*/, sizeof(gfn), (unsigned char*)&gfn);
+ }
+}
+
/* Pull all the entries on an out-of-sync page back into sync. */
static void _sh_resync(struct vcpu *v, mfn_t gmfn,
struct oos_fixup *fixup, mfn_t snp)
@@ -719,6 +734,7 @@ static void _sh_resync(struct vcpu *v, m
/* Now we know all the entries are synced, and will stay that way */
pg->shadow_flags &= ~SHF_out_of_sync;
perfc_incr(shadow_resync);
+ trace_resync(TRC_SHADOW_RESYNC_FULL, gmfn);
}
@@ -930,6 +946,7 @@ void sh_resync_all(struct vcpu *v, int s
/* Update the shadows and leave the page OOS. */
if ( sh_skip_sync(v, oos[idx]) )
continue;
+ trace_resync(TRC_SHADOW_RESYNC_ONLY, oos[idx]);
_sh_resync_l1(other, oos[idx], oos_snapshot[idx]);
}
else
@@ -945,7 +962,8 @@ void sh_resync_all(struct vcpu *v, int s
}
}
-/* Allow a shadowed page to go out of sync */
+/* Allow a shadowed page to go out of sync. Unsyncs are traced in
+ * multi.c:sh_page_fault() */
int sh_unsync(struct vcpu *v, mfn_t gmfn)
{
struct page_info *pg;
@@ -970,6 +988,7 @@ int sh_unsync(struct vcpu *v, mfn_t gmfn
pg->shadow_flags |= SHF_out_of_sync|SHF_oos_may_write;
oos_hash_add(v, gmfn);
perfc_incr(shadow_unsync);
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_UNSYNC);
return 1;
}
@@ -1005,6 +1024,7 @@ void shadow_promote(struct vcpu *v, mfn_
ASSERT(!test_bit(type, &page->shadow_flags));
set_bit(type, &page->shadow_flags);
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_PROMOTE);
}
void shadow_demote(struct vcpu *v, mfn_t gmfn, u32 type)
@@ -1027,6 +1047,8 @@ void shadow_demote(struct vcpu *v, mfn_t
#endif
clear_bit(_PGC_page_table, &page->count_info);
}
+
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_DEMOTE);
}
/**************************************************************************/
@@ -1094,6 +1116,7 @@ sh_validate_guest_entry(struct vcpu *v,
ASSERT((page->shadow_flags
& (SHF_L4_64|SHF_L3_64|SHF_L2H_64|SHF_L2_64|SHF_L1_64)) == 0);
#endif
+ this_cpu(trace_shadow_path_flags) |= (result<<(TRCE_SFLAG_SET_CHANGED));
return result;
}
@@ -1295,6 +1318,18 @@ static void shadow_unhook_mappings(struc
}
}
+static inline void trace_shadow_prealloc_unpin(struct domain *d, mfn_t smfn)
+{
+ if ( tb_init_done )
+ {
+ /* Convert smfn to gfn */
+ unsigned long gfn;
+ ASSERT(mfn_valid(smfn));
+ gfn = mfn_to_gfn(d, _mfn(mfn_to_shadow_page(smfn)->backpointer));
+ __trace_var(TRC_SHADOW_PREALLOC_UNPIN, 0/*!tsc*/,
+ sizeof(gfn), (unsigned char*)&gfn);
+ }
+}
/* Make sure there are at least count order-sized pages
* available in the shadow page pool. */
@@ -1327,6 +1362,7 @@ static void _shadow_prealloc(
smfn = shadow_page_to_mfn(sp);
/* Unpin this top-level shadow */
+ trace_shadow_prealloc_unpin(d, smfn);
sh_unpin(v, smfn);
/* See if that freed up enough space */
@@ -1343,6 +1379,7 @@ static void _shadow_prealloc(
{
if ( !pagetable_is_null(v2->arch.shadow_table[i]) )
{
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_PREALLOC_UNHOOK);
shadow_unhook_mappings(v,
pagetable_get_mfn(v2->arch.shadow_table[i]));
@@ -2200,6 +2237,16 @@ void sh_destroy_shadow(struct vcpu *v, m
}
}
+static inline void trace_shadow_wrmap_bf(mfn_t gmfn)
+{
+ if ( tb_init_done )
+ {
+ /* Convert gmfn to gfn */
+ unsigned long gfn = mfn_to_gfn(current->domain, gmfn);
+ __trace_var(TRC_SHADOW_WRMAP_BF, 0/*!tsc*/, sizeof(gfn), (unsigned
char*)&gfn);
+ }
+}
+
/**************************************************************************/
/* Remove all writeable mappings of a guest frame from the shadow tables
* Returns non-zero if we need to flush TLBs.
@@ -2265,6 +2312,8 @@ int sh_remove_write_access(struct vcpu *
|| (pg->u.inuse.type_info & PGT_count_mask) == 0 )
return 0;
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_WRMAP);
+
perfc_incr(shadow_writeable);
/* If this isn't a "normal" writeable page, the domain is trying to
@@ -2285,11 +2334,14 @@ int sh_remove_write_access(struct vcpu *
* and that mapping is likely to be in the current pagetable,
* in the guest's linear map (on non-HIGHPTE linux and windows)*/
-#define GUESS(_a, _h) do { \
+#define GUESS(_a, _h) do { \
if ( v->arch.paging.mode->shadow.guess_wrmap(v, (_a), gmfn) ) \
- perfc_incr(shadow_writeable_h_ ## _h); \
- if ( (pg->u.inuse.type_info & PGT_count_mask) == 0 ) \
- return 1; \
+ perfc_incr(shadow_writeable_h_ ## _h); \
+ if ( (pg->u.inuse.type_info & PGT_count_mask) == 0 ) \
+ { \
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_WRMAP_GUESS_FOUND); \
+ return 1; \
+ } \
} while (0)
if ( level == 0 && fault_addr )
@@ -2377,6 +2429,7 @@ int sh_remove_write_access(struct vcpu *
#endif /* SHADOW_OPTIMIZATIONS & SHOPT_WRITABLE_HEURISTIC */
/* Brute-force search of all the shadows, by walking the hash */
+ trace_shadow_wrmap_bf(gmfn);
if ( level == 0 )
perfc_incr(shadow_writeable_bf_1);
else
diff -r 8305efd06749 -r 74621a2add54 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c Mon Sep 08 15:58:04 2008 +0100
@@ -225,6 +225,7 @@ static uint32_t set_ad_bits(void *guest_
static uint32_t set_ad_bits(void *guest_p, void *walk_p, int set_dirty)
{
guest_intpte_t old, new;
+ int ret = 0;
old = *(guest_intpte_t *)walk_p;
new = old | _PAGE_ACCESSED | (set_dirty ? _PAGE_DIRTY : 0);
@@ -234,10 +235,16 @@ static uint32_t set_ad_bits(void *guest_
* into the guest table as well. If the guest table has changed
* under out feet then leave it alone. */
*(guest_intpte_t *)walk_p = new;
- if ( cmpxchg(((guest_intpte_t *)guest_p), old, new) == old )
- return 1;
- }
- return 0;
+ if( cmpxchg(((guest_intpte_t *)guest_p), old, new) == old )
+ ret = 1;
+
+ /* FIXME -- this code is longer than necessary */
+ if(set_dirty)
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SET_AD);
+ else
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SET_A);
+ }
+ return ret;
}
/* This validation is called with lock held, and after write permission
@@ -1432,6 +1439,7 @@ static int shadow_set_l1e(struct vcpu *v
{
/* About to install a new reference */
if ( shadow_mode_refcounts(d) ) {
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SHADOW_L1_GET_REF);
if ( shadow_get_page_from_l1e(new_sl1e, d) == 0 )
{
/* Doesn't look like a pagetable. */
@@ -1461,6 +1469,7 @@ static int shadow_set_l1e(struct vcpu *v
{
shadow_vram_put_l1e(old_sl1e, sl1e, sl1mfn, d);
shadow_put_page_from_l1e(old_sl1e, d);
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_SHADOW_L1_PUT_REF);
}
}
return flags;
@@ -2896,6 +2905,7 @@ static inline void check_for_early_unsha
{
perfc_incr(shadow_early_unshadow);
sh_remove_shadows(v, gmfn, 1, 0 /* Fast, can fail to unshadow */ );
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_EARLY_UNSHADOW);
}
v->arch.paging.shadow.last_emulated_mfn_for_unshadow = mfn_x(gmfn);
#endif
@@ -3012,6 +3022,132 @@ static void sh_prefetch(struct vcpu *v,
#endif /* SHADOW_OPTIMIZATIONS & SHOPT_PREFETCH */
+#if GUEST_PAGING_LEVELS == 4
+typedef u64 guest_va_t;
+typedef u64 guest_pa_t;
+#elif GUEST_PAGING_LEVELS == 3
+typedef u32 guest_va_t;
+typedef u64 guest_pa_t;
+#else
+typedef u32 guest_va_t;
+typedef u32 guest_pa_t;
+#endif
+
+static inline void trace_shadow_gen(u32 event, guest_va_t va)
+{
+ if ( tb_init_done )
+ {
+ event |= (GUEST_PAGING_LEVELS-2)<<8;
+ __trace_var(event, 0/*!tsc*/, sizeof(va), (unsigned char*)&va);
+ }
+}
+
+static inline void trace_shadow_fixup(guest_l1e_t gl1e,
+ guest_va_t va)
+{
+ if ( tb_init_done )
+ {
+ struct {
+ /* for PAE, guest_l1e may be 64 while guest_va may be 32;
+ so put it first for alignment sake. */
+ guest_l1e_t gl1e;
+ guest_va_t va;
+ u32 flags;
+ } __attribute__((packed)) d;
+ u32 event;
+
+ event = TRC_SHADOW_FIXUP | ((GUEST_PAGING_LEVELS-2)<<8);
+
+ d.gl1e = gl1e;
+ d.va = va;
+ d.flags = this_cpu(trace_shadow_path_flags);
+
+ __trace_var(event, 0/*!tsc*/, sizeof(d), (unsigned char*)&d);
+ }
+}
+
+static inline void trace_not_shadow_fault(guest_l1e_t gl1e,
+ guest_va_t va)
+{
+ if ( tb_init_done )
+ {
+ struct {
+ /* for PAE, guest_l1e may be 64 while guest_va may be 32;
+ so put it first for alignment sake. */
+ guest_l1e_t gl1e;
+ guest_va_t va;
+ u32 flags;
+ } __attribute__((packed)) d;
+ u32 event;
+
+ event = TRC_SHADOW_NOT_SHADOW | ((GUEST_PAGING_LEVELS-2)<<8);
+
+ d.gl1e = gl1e;
+ d.va = va;
+ d.flags = this_cpu(trace_shadow_path_flags);
+
+ __trace_var(event, 0/*!tsc*/, sizeof(d), (unsigned char*)&d);
+ }
+}
+
+static inline void trace_shadow_emulate_other(u32 event,
+ guest_va_t va,
+ gfn_t gfn)
+{
+ if ( tb_init_done )
+ {
+ struct {
+ /* for PAE, guest_l1e may be 64 while guest_va may be 32;
+ so put it first for alignment sake. */
+#if GUEST_PAGING_LEVELS == 2
+ u32 gfn;
+#else
+ u64 gfn;
+#endif
+ guest_va_t va;
+ } __attribute__((packed)) d;
+
+ event |= ((GUEST_PAGING_LEVELS-2)<<8);
+
+ d.gfn=gfn_x(gfn);
+ d.va = va;
+
+ __trace_var(event, 0/*!tsc*/, sizeof(d), (unsigned char*)&d);
+ }
+}
+
+#if GUEST_PAGING_LEVELS == 3
+static DEFINE_PER_CPU(guest_va_t,trace_emulate_initial_va);
+static DEFINE_PER_CPU(int,trace_extra_emulation_count);
+#endif
+static DEFINE_PER_CPU(guest_pa_t,trace_emulate_write_val);
+
+static inline void trace_shadow_emulate(guest_l1e_t gl1e, unsigned long va)
+{
+ if ( tb_init_done )
+ {
+ struct {
+ /* for PAE, guest_l1e may be 64 while guest_va may be 32;
+ so put it first for alignment sake. */
+ guest_l1e_t gl1e, write_val;
+ guest_va_t va;
+ unsigned flags:29, emulation_count:3;
+ } __attribute__((packed)) d;
+ u32 event;
+
+ event = TRC_SHADOW_EMULATE | ((GUEST_PAGING_LEVELS-2)<<8);
+
+ d.gl1e = gl1e;
+ d.write_val.l1 = this_cpu(trace_emulate_write_val);
+ d.va = va;
+#if GUEST_PAGING_LEVELS == 3
+ d.emulation_count = this_cpu(trace_extra_emulation_count);
+#endif
+ d.flags = this_cpu(trace_shadow_path_flags);
+
+ __trace_var(event, 0/*!tsc*/, sizeof(d), (unsigned char*)&d);
+ }
+}
/**************************************************************************/
/* Entry points into the shadow code */
@@ -3027,8 +3163,8 @@ static int sh_page_fault(struct vcpu *v,
{
struct domain *d = v->domain;
walk_t gw;
- gfn_t gfn;
- mfn_t gmfn, sl1mfn=_mfn(0);
+ gfn_t gfn = _gfn(0);
+ mfn_t gmfn, sl1mfn = _mfn(0);
shadow_l1e_t sl1e, *ptr_sl1e;
paddr_t gpa;
struct sh_emulate_ctxt emul_ctxt;
@@ -3132,6 +3268,7 @@ static int sh_page_fault(struct vcpu *v,
reset_early_unshadow(v);
perfc_incr(shadow_fault_fast_gnp);
SHADOW_PRINTK("fast path not-present\n");
+ trace_shadow_gen(TRC_SHADOW_FAST_PROPAGATE, va);
return 0;
}
else
@@ -3145,6 +3282,7 @@ static int sh_page_fault(struct vcpu *v,
perfc_incr(shadow_fault_fast_mmio);
SHADOW_PRINTK("fast path mmio %#"PRIpaddr"\n", gpa);
reset_early_unshadow(v);
+ trace_shadow_gen(TRC_SHADOW_FAST_MMIO, va);
return (handle_mmio_with_translation(va, gpa >> PAGE_SHIFT)
? EXCRET_fault_fixed : 0);
}
@@ -3155,6 +3293,7 @@ static int sh_page_fault(struct vcpu *v,
* Retry and let the hardware give us the right fault next time. */
perfc_incr(shadow_fault_fast_fail);
SHADOW_PRINTK("fast path false alarm!\n");
+ trace_shadow_gen(TRC_SHADOW_FALSE_FAST_PATH, va);
return EXCRET_fault_fixed;
}
}
@@ -3190,7 +3329,7 @@ static int sh_page_fault(struct vcpu *v,
perfc_incr(shadow_fault_bail_real_fault);
SHADOW_PRINTK("not a shadow fault\n");
reset_early_unshadow(v);
- return 0;
+ goto propagate;
}
/* It's possible that the guest has put pagetables in memory that it has
@@ -3200,7 +3339,7 @@ static int sh_page_fault(struct vcpu *v,
if ( unlikely(d->is_shutting_down) )
{
SHADOW_PRINTK("guest is shutting down\n");
- return 0;
+ goto propagate;
}
/* What kind of access are we dealing with? */
@@ -3218,7 +3357,7 @@ static int sh_page_fault(struct vcpu *v,
SHADOW_PRINTK("BAD gfn=%"SH_PRI_gfn" gmfn=%"PRI_mfn"\n",
gfn_x(gfn), mfn_x(gmfn));
reset_early_unshadow(v);
- return 0;
+ goto propagate;
}
#if (SHADOW_OPTIMIZATIONS & SHOPT_VIRTUAL_TLB)
@@ -3229,6 +3368,8 @@ static int sh_page_fault(struct vcpu *v,
shadow_lock(d);
+ TRACE_CLEAR_PATH_FLAGS;
+
rc = gw_remove_write_accesses(v, va, &gw);
/* First bit set: Removed write access to a page. */
@@ -3281,6 +3422,7 @@ static int sh_page_fault(struct vcpu *v,
* Get out of the fault handler immediately. */
ASSERT(d->is_shutting_down);
shadow_unlock(d);
+ trace_shadow_gen(TRC_SHADOW_DOMF_DYING, va);
return 0;
}
@@ -3383,6 +3525,7 @@ static int sh_page_fault(struct vcpu *v,
d->arch.paging.log_dirty.fault_count++;
reset_early_unshadow(v);
+ trace_shadow_fixup(gw.l1e, va);
done:
sh_audit_gw(v, &gw);
SHADOW_PRINTK("fixed\n");
@@ -3405,6 +3548,8 @@ static int sh_page_fault(struct vcpu *v,
mfn_x(gmfn));
perfc_incr(shadow_fault_emulate_failed);
sh_remove_shadows(v, gmfn, 0 /* thorough */, 1 /* must succeed */);
+ trace_shadow_emulate_other(TRC_SHADOW_EMULATE_UNSHADOW_USER,
+ va, gfn);
goto done;
}
@@ -3421,6 +3566,8 @@ static int sh_page_fault(struct vcpu *v,
shadow_audit_tables(v);
shadow_unlock(d);
+ this_cpu(trace_emulate_write_val) = 0;
+
#if SHADOW_OPTIMIZATIONS & SHOPT_FAST_EMULATION
early_emulation:
#endif
@@ -3446,6 +3593,8 @@ static int sh_page_fault(struct vcpu *v,
"injection: cr2=%#lx, mfn=%#lx\n",
va, mfn_x(gmfn));
sh_remove_shadows(v, gmfn, 0 /* thorough */, 1 /* must succeed */);
+ trace_shadow_emulate_other(TRC_SHADOW_EMULATE_UNSHADOW_EVTINJ,
+ va, gfn);
return EXCRET_fault_fixed;
}
}
@@ -3478,6 +3627,10 @@ static int sh_page_fault(struct vcpu *v,
* to support more operations in the emulator. More likely,
* though, this is a hint that this page should not be shadowed. */
shadow_remove_all_shadows(v, gmfn);
+
+ trace_shadow_emulate_other(TRC_SHADOW_EMULATE_UNSHADOW_UNHANDLED,
+ va, gfn);
+ goto emulate_done;
}
#if SHADOW_OPTIMIZATIONS & SHOPT_FAST_EMULATION
@@ -3504,7 +3657,8 @@ static int sh_page_fault(struct vcpu *v,
#if GUEST_PAGING_LEVELS == 3 /* PAE guest */
if ( r == X86EMUL_OKAY ) {
- int i;
+ int i, emulation_count=0;
+ this_cpu(trace_emulate_initial_va) = va;
/* Emulate up to four extra instructions in the hope of catching
* the "second half" of a 64-bit pagetable write. */
for ( i = 0 ; i < 4 ; i++ )
@@ -3513,10 +3667,12 @@ static int sh_page_fault(struct vcpu *v,
v->arch.paging.last_write_was_pt = 0;
r = x86_emulate(&emul_ctxt.ctxt, emul_ops);
if ( r == X86EMUL_OKAY )
- {
+ {
+ emulation_count++;
if ( v->arch.paging.last_write_was_pt )
{
perfc_incr(shadow_em_ex_pt);
+
TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_EMULATION_2ND_PT_WRITTEN);
break; /* Don't emulate past the other half of the write */
}
else
@@ -3525,12 +3681,16 @@ static int sh_page_fault(struct vcpu *v,
else
{
perfc_incr(shadow_em_ex_fail);
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_EMULATION_LAST_FAILED);
break; /* Don't emulate again if we failed! */
}
}
+ this_cpu(trace_extra_emulation_count)=emulation_count;
}
#endif /* PAE guest */
+ trace_shadow_emulate(gw.l1e, va);
+ emulate_done:
SHADOW_PRINTK("emulated\n");
return EXCRET_fault_fixed;
@@ -3543,6 +3703,7 @@ static int sh_page_fault(struct vcpu *v,
shadow_audit_tables(v);
reset_early_unshadow(v);
shadow_unlock(d);
+ trace_shadow_gen(TRC_SHADOW_MMIO, va);
return (handle_mmio_with_translation(va, gpa >> PAGE_SHIFT)
? EXCRET_fault_fixed : 0);
@@ -3552,6 +3713,10 @@ static int sh_page_fault(struct vcpu *v,
shadow_audit_tables(v);
reset_early_unshadow(v);
shadow_unlock(d);
+
+propagate:
+ trace_not_shadow_fault(gw.l1e, va);
+
return 0;
}
@@ -3990,7 +4155,7 @@ sh_detach_old_tables(struct vcpu *v)
sh_unmap_domain_page_global(v->arch.paging.shadow.guest_vtable);
v->arch.paging.shadow.guest_vtable = NULL;
}
-#endif
+#endif // !NDEBUG
////
@@ -4446,6 +4611,7 @@ static int sh_guess_wrmap(struct vcpu *v
sl1e = shadow_l1e_remove_flags(sl1e, _PAGE_RW);
r = shadow_set_l1e(v, sl1p, sl1e, sl1mfn);
ASSERT( !(r & SHADOW_SET_ERROR) );
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_WRMAP_GUESS_FOUND);
return 1;
}
#endif
@@ -4800,7 +4966,7 @@ static void emulate_unmap_dest(struct vc
static int
sh_x86_emulate_write(struct vcpu *v, unsigned long vaddr, void *src,
- u32 bytes, struct sh_emulate_ctxt *sh_ctxt)
+ u32 bytes, struct sh_emulate_ctxt *sh_ctxt)
{
void *addr;
@@ -4814,6 +4980,22 @@ sh_x86_emulate_write(struct vcpu *v, uns
shadow_lock(v->domain);
memcpy(addr, src, bytes);
+
+ if ( tb_init_done )
+ {
+#if GUEST_PAGING_LEVELS == 3
+ if ( vaddr == this_cpu(trace_emulate_initial_va) )
+ memcpy(&this_cpu(trace_emulate_write_val), src, bytes);
+ else if ( (vaddr & ~(0x7UL)) == this_cpu(trace_emulate_initial_va) )
+ {
+ TRACE_SHADOW_PATH_FLAG(TRCE_SFLAG_EMULATE_FULL_PT);
+ memcpy(&this_cpu(trace_emulate_write_val),
+ (void *)(((unsigned long) addr) & ~(0x7UL)),
GUEST_PTE_SIZE);
+ }
+#else
+ memcpy(&this_cpu(trace_emulate_write_val), src, bytes);
+#endif
+ }
emulate_unmap_dest(v, addr, bytes, sh_ctxt);
shadow_audit_tables(v);
diff -r 8305efd06749 -r 74621a2add54 xen/arch/x86/mm/shadow/private.h
--- a/xen/arch/x86/mm/shadow/private.h Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/arch/x86/mm/shadow/private.h Mon Sep 08 15:58:04 2008 +0100
@@ -90,6 +90,43 @@ extern int shadow_audit_enable;
#define SHADOW_DEBUG_EMULATE 1
#define SHADOW_DEBUG_P2M 1
#define SHADOW_DEBUG_LOGDIRTY 0
+
+/******************************************************************************
+ * Tracing
+ */
+DECLARE_PER_CPU(uint32_t,trace_shadow_path_flags);
+
+#define TRACE_SHADOW_PATH_FLAG(_x) \
+ do { \
+ this_cpu(trace_shadow_path_flags) |= (1<<(_x)); \
+ } while(0)
+
+#define TRACE_CLEAR_PATH_FLAGS \
+ this_cpu(trace_shadow_path_flags) = 0
+
+enum {
+ TRCE_SFLAG_SET_AD,
+ TRCE_SFLAG_SET_A,
+ TRCE_SFLAG_SHADOW_L1_GET_REF,
+ TRCE_SFLAG_SHADOW_L1_PUT_REF,
+ TRCE_SFLAG_L2_PROPAGATE,
+ TRCE_SFLAG_SET_CHANGED,
+ TRCE_SFLAG_SET_FLUSH,
+ TRCE_SFLAG_SET_ERROR,
+ TRCE_SFLAG_DEMOTE,
+ TRCE_SFLAG_PROMOTE,
+ TRCE_SFLAG_WRMAP,
+ TRCE_SFLAG_WRMAP_GUESS_FOUND,
+ TRCE_SFLAG_WRMAP_BRUTE_FORCE,
+ TRCE_SFLAG_EARLY_UNSHADOW,
+ TRCE_SFLAG_EMULATION_2ND_PT_WRITTEN,
+ TRCE_SFLAG_EMULATION_LAST_FAILED,
+ TRCE_SFLAG_EMULATE_FULL_PT,
+ TRCE_SFLAG_PREALLOC_UNHOOK,
+ TRCE_SFLAG_UNSYNC,
+ TRCE_SFLAG_OOS_FIXUP_ADD,
+ TRCE_SFLAG_OOS_FIXUP_EVICT,
+};
/******************************************************************************
* The shadow lock.
@@ -143,6 +180,12 @@ extern int shadow_audit_enable;
} while (0)
+/* Size (in bytes) of a guest PTE */
+#if GUEST_PAGING_LEVELS >= 3
+# define GUEST_PTE_SIZE 8
+#else
+# define GUEST_PTE_SIZE 4
+#endif
/******************************************************************************
* Auditing routines
diff -r 8305efd06749 -r 74621a2add54 xen/common/trace.c
--- a/xen/common/trace.c Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/common/trace.c Mon Sep 08 15:58:04 2008 +0100
@@ -148,6 +148,31 @@ static int tb_set_size(int size)
return 0;
}
+int trace_will_trace_event(u32 event)
+{
+ if ( !tb_init_done )
+ return 0;
+
+ /*
+ * Copied from __trace_var()
+ */
+ if ( (tb_event_mask & event) == 0 )
+ return 0;
+
+ /* match class */
+ if ( ((tb_event_mask >> TRC_CLS_SHIFT) & (event >> TRC_CLS_SHIFT)) == 0 )
+ return 0;
+
+ /* then match subclass */
+ if ( (((tb_event_mask >> TRC_SUBCLS_SHIFT) & 0xf )
+ & ((event >> TRC_SUBCLS_SHIFT) & 0xf )) == 0 )
+ return 0;
+
+ if ( !cpu_isset(smp_processor_id(), tb_cpu_mask) )
+ return 0;
+
+ return 1;
+}
/**
* init_trace_bufs - performs initialization of the per-cpu trace buffers.
@@ -407,7 +432,8 @@ void __trace_var(u32 event, int cycles,
int extra_word;
int started_below_highwater;
- ASSERT(tb_init_done);
+ if( !tb_init_done )
+ return;
/* Convert byte count into word count, rounding up */
extra_word = (extra / sizeof(u32));
diff -r 8305efd06749 -r 74621a2add54 xen/include/public/trace.h
--- a/xen/include/public/trace.h Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/include/public/trace.h Mon Sep 08 15:58:04 2008 +0100
@@ -37,6 +37,7 @@
#define TRC_HVM 0x0008f000 /* Xen HVM trace */
#define TRC_MEM 0x0010f000 /* Xen memory trace */
#define TRC_PV 0x0020f000 /* Xen PV traces */
+#define TRC_SHADOW 0x0040f000 /* Xen shadow tracing */
#define TRC_ALL 0x0ffff000
#define TRC_HD_TO_EVENT(x) ((x)&0x0fffffff)
#define TRC_HD_CYCLE_FLAG (1UL<<31)
@@ -92,6 +93,22 @@
#define TRC_PV_PTWR_EMULATION_PAE (TRC_PV + 12)
/* Indicates that addresses in trace record are 64 bits */
#define TRC_64_FLAG (0x100)
+
+#define TRC_SHADOW_NOT_SHADOW (TRC_SHADOW + 1)
+#define TRC_SHADOW_FAST_PROPAGATE (TRC_SHADOW + 2)
+#define TRC_SHADOW_FAST_MMIO (TRC_SHADOW + 3)
+#define TRC_SHADOW_FALSE_FAST_PATH (TRC_SHADOW + 4)
+#define TRC_SHADOW_MMIO (TRC_SHADOW + 5)
+#define TRC_SHADOW_FIXUP (TRC_SHADOW + 6)
+#define TRC_SHADOW_DOMF_DYING (TRC_SHADOW + 7)
+#define TRC_SHADOW_EMULATE (TRC_SHADOW + 8)
+#define TRC_SHADOW_EMULATE_UNSHADOW_USER (TRC_SHADOW + 9)
+#define TRC_SHADOW_EMULATE_UNSHADOW_EVTINJ (TRC_SHADOW + 10)
+#define TRC_SHADOW_EMULATE_UNSHADOW_UNHANDLED (TRC_SHADOW + 11)
+#define TRC_SHADOW_WRMAP_BF (TRC_SHADOW + 12)
+#define TRC_SHADOW_PREALLOC_UNPIN (TRC_SHADOW + 13)
+#define TRC_SHADOW_RESYNC_FULL (TRC_SHADOW + 14)
+#define TRC_SHADOW_RESYNC_ONLY (TRC_SHADOW + 15)
/* trace events per subclass */
#define TRC_HVM_VMENTRY (TRC_HVM_ENTRYEXIT + 0x01)
diff -r 8305efd06749 -r 74621a2add54 xen/include/xen/trace.h
--- a/xen/include/xen/trace.h Mon Sep 08 15:52:50 2008 +0100
+++ b/xen/include/xen/trace.h Mon Sep 08 15:58:04 2008 +0100
@@ -33,6 +33,8 @@ void init_trace_bufs(void);
/* used to retrieve the physical address of the trace buffers */
int tb_control(struct xen_sysctl_tbuf_op *tbc);
+
+int trace_will_trace_event(u32 event);
void __trace_var(u32 event, int cycles, int extra, unsigned char *extra_data);
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