diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/mmutrace.h | 117 | ||||
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 11 |
3 files changed, 128 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index b67585c1ef0..c0dda6447b9 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -140,6 +140,9 @@ module_param(oos_shadow, bool, 0644); #define ACC_USER_MASK PT_USER_MASK #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) +#define CREATE_TRACE_POINTS +#include "mmutrace.h" + #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) struct kvm_rmap_desc { diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h new file mode 100644 index 00000000000..1367f82717d --- /dev/null +++ b/arch/x86/kvm/mmutrace.h @@ -0,0 +1,117 @@ +#if !defined(_TRACE_KVMMMU_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_KVMMMU_H + +#include <linux/tracepoint.h> + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM kvmmmu +#define TRACE_INCLUDE_PATH . +#define TRACE_INCLUDE_FILE mmutrace + +#define kvm_mmu_trace_pferr_flags \ + { PFERR_PRESENT_MASK, "P" }, \ + { PFERR_WRITE_MASK, "W" }, \ + { PFERR_USER_MASK, "U" }, \ + { PFERR_RSVD_MASK, "RSVD" }, \ + { PFERR_FETCH_MASK, "F" } + +/* + * A pagetable walk has started + */ +TRACE_EVENT( + kvm_mmu_pagetable_walk, + TP_PROTO(u64 addr, int write_fault, int user_fault, int fetch_fault), + TP_ARGS(addr, write_fault, user_fault, fetch_fault), + + TP_STRUCT__entry( + __field(__u64, addr) + __field(__u32, pferr) + ), + + TP_fast_assign( + __entry->addr = addr; + __entry->pferr = (!!write_fault << 1) | (!!user_fault << 2) + | (!!fetch_fault << 4); + ), + + TP_printk("addr %llx pferr %x %s", __entry->addr, __entry->pferr, + __print_flags(__entry->pferr, "|", kvm_mmu_trace_pferr_flags)) +); + + +/* We just walked a paging element */ +TRACE_EVENT( + kvm_mmu_paging_element, + TP_PROTO(u64 pte, int level), + TP_ARGS(pte, level), + + TP_STRUCT__entry( + __field(__u64, pte) + __field(__u32, level) + ), + + TP_fast_assign( + __entry->pte = pte; + __entry->level = level; + ), + + TP_printk("pte %llx level %u", __entry->pte, __entry->level) +); + +/* We set a pte accessed bit */ +TRACE_EVENT( + kvm_mmu_set_accessed_bit, + TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size), + TP_ARGS(table_gfn, index, size), + + TP_STRUCT__entry( + __field(__u64, gpa) + ), + + TP_fast_assign( + __entry->gpa = ((u64)table_gfn << PAGE_SHIFT) + + index * size; + ), + + TP_printk("gpa %llx", __entry->gpa) +); + +/* We set a pte dirty bit */ +TRACE_EVENT( + kvm_mmu_set_dirty_bit, + TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size), + TP_ARGS(table_gfn, index, size), + + TP_STRUCT__entry( + __field(__u64, gpa) + ), + + TP_fast_assign( + __entry->gpa = ((u64)table_gfn << PAGE_SHIFT) + + index * size; + ), + + TP_printk("gpa %llx", __entry->gpa) +); + +TRACE_EVENT( + kvm_mmu_walker_error, + TP_PROTO(u32 pferr), + TP_ARGS(pferr), + + TP_STRUCT__entry( + __field(__u32, pferr) + ), + + TP_fast_assign( + __entry->pferr = pferr; + ), + + TP_printk("pferr %x %s", __entry->pferr, + __print_flags(__entry->pferr, "|", kvm_mmu_trace_pferr_flags)) +); + +#endif /* _TRACE_KVMMMU_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 53e129cec5f..36ac6d70a84 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -125,13 +125,15 @@ static int FNAME(walk_addr)(struct guest_walker *walker, gpa_t pte_gpa; int rsvd_fault = 0; - pgprintk("%s: addr %lx\n", __func__, addr); + trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault, + fetch_fault); walk: walker->level = vcpu->arch.mmu.root_level; pte = vcpu->arch.cr3; #if PTTYPE == 64 if (!is_long_mode(vcpu)) { pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3); + trace_kvm_mmu_paging_element(pte, walker->level); if (!is_present_gpte(pte)) goto not_present; --walker->level; @@ -150,10 +152,9 @@ walk: pte_gpa += index * sizeof(pt_element_t); walker->table_gfn[walker->level - 1] = table_gfn; walker->pte_gpa[walker->level - 1] = pte_gpa; - pgprintk("%s: table_gfn[%d] %lx\n", __func__, - walker->level - 1, table_gfn); kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)); + trace_kvm_mmu_paging_element(pte, walker->level); if (!is_present_gpte(pte)) goto not_present; @@ -175,6 +176,8 @@ walk: #endif if (!(pte & PT_ACCESSED_MASK)) { + trace_kvm_mmu_set_accessed_bit(table_gfn, index, + sizeof(pte)); mark_page_dirty(vcpu->kvm, table_gfn); if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte, pte|PT_ACCESSED_MASK)) @@ -208,6 +211,7 @@ walk: if (write_fault && !is_dirty_gpte(pte)) { bool ret; + trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte)); mark_page_dirty(vcpu->kvm, table_gfn); ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte, pte|PT_DIRTY_MASK); @@ -239,6 +243,7 @@ err: walker->error_code |= PFERR_FETCH_MASK; if (rsvd_fault) walker->error_code |= PFERR_RSVD_MASK; + trace_kvm_mmu_walker_error(walker->error_code); return 0; } |