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c4371c2a68
linux/arch/x86/kvm/mmu/mmutrace.h
Sean Christopherson c4371c2a68 KVM: x86/mmu: Return unique RET_PF_* values if the fault was fixed 
Introduce RET_PF_FIXED and RET_PF_SPURIOUS to provide unique return
values instead of overloading RET_PF_RETRY.  In the short term, the
unique values add clarity to the code and RET_PF_SPURIOUS will be used
by set_spte() to avoid unnecessary work for spurious faults.

In the long term, TDX will use RET_PF_FIXED to deterministically map
memory during pre-boot.  The page fault flow may bail early for benign
reasons, e.g. if the mmu_notifier fires for an unrelated address.  With
only RET_PF_RETRY, it's impossible for the caller to distinguish between
"cool, page is mapped" and "darn, need to try again", and thus cannot
handle benign cases like the mmu_notifier retry.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923220425.18402-4-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-09-28 07:57:36 -04:00

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/* SPDX-License-Identifier: GPL-2.0 */
#if !defined(_TRACE_KVMMMU_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_KVMMMU_H
#include <linux/tracepoint.h>
#include <linux/trace_events.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvmmmu
#define KVM_MMU_PAGE_FIELDS \
__field(__u8, mmu_valid_gen) \
__field(__u64, gfn) \
__field(__u32, role) \
__field(__u32, root_count) \
__field(bool, unsync)
#define KVM_MMU_PAGE_ASSIGN(sp) \
__entry->mmu_valid_gen = sp->mmu_valid_gen; \
__entry->gfn = sp->gfn; \
__entry->role = sp->role.word; \
__entry->root_count = sp->root_count; \
__entry->unsync = sp->unsync;
#define KVM_MMU_PAGE_PRINTK() ({ \
const char *saved_ptr = trace_seq_buffer_ptr(p); \
static const char *access_str[] = { \
"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux" \
}; \
union kvm_mmu_page_role role; \
\
role.word = __entry->role; \
\
trace_seq_printf(p, "sp gen %u gfn %llx l%u %u-byte q%u%s %s%s" \
" %snxe %sad root %u %s%c", \
__entry->mmu_valid_gen, \
__entry->gfn, role.level, \
role.gpte_is_8_bytes ? 8 : 4, \
role.quadrant, \
role.direct ? " direct" : "", \
access_str[role.access], \
role.invalid ? " invalid" : "", \
role.nxe ? "" : "!", \
role.ad_disabled ? "!" : "", \
__entry->root_count, \
__entry->unsync ? "unsync" : "sync", 0); \
saved_ptr; \
})
#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, u32 pferr),
TP_ARGS(addr, pferr),
TP_STRUCT__entry(
__field(__u64, addr)
__field(__u32, pferr)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pferr = pferr;
),
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)
);
DECLARE_EVENT_CLASS(kvm_mmu_set_bit_class,
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 accessed bit */
DEFINE_EVENT(kvm_mmu_set_bit_class, kvm_mmu_set_accessed_bit,
TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size),
TP_ARGS(table_gfn, index, size)
);
/* We set a pte dirty bit */
DEFINE_EVENT(kvm_mmu_set_bit_class, kvm_mmu_set_dirty_bit,
TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size),
TP_ARGS(table_gfn, index, size)
);
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))
);
TRACE_EVENT(
kvm_mmu_get_page,
TP_PROTO(struct kvm_mmu_page *sp, bool created),
TP_ARGS(sp, created),
TP_STRUCT__entry(
KVM_MMU_PAGE_FIELDS
__field(bool, created)
),
TP_fast_assign(
KVM_MMU_PAGE_ASSIGN(sp)
__entry->created = created;
),
TP_printk("%s %s", KVM_MMU_PAGE_PRINTK(),
__entry->created ? "new" : "existing")
);
DECLARE_EVENT_CLASS(kvm_mmu_page_class,
TP_PROTO(struct kvm_mmu_page *sp),
TP_ARGS(sp),
TP_STRUCT__entry(
KVM_MMU_PAGE_FIELDS
),
TP_fast_assign(
KVM_MMU_PAGE_ASSIGN(sp)
),
TP_printk("%s", KVM_MMU_PAGE_PRINTK())
);
DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_sync_page,
TP_PROTO(struct kvm_mmu_page *sp),
TP_ARGS(sp)
);
DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_unsync_page,
TP_PROTO(struct kvm_mmu_page *sp),
TP_ARGS(sp)
);
DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
TP_PROTO(struct kvm_mmu_page *sp),
TP_ARGS(sp)
);
TRACE_EVENT(
mark_mmio_spte,
TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access, unsigned int gen),
TP_ARGS(sptep, gfn, access, gen),
TP_STRUCT__entry(
__field(void *, sptep)
__field(gfn_t, gfn)
__field(unsigned, access)
__field(unsigned int, gen)
),
TP_fast_assign(
__entry->sptep = sptep;
__entry->gfn = gfn;
__entry->access = access;
__entry->gen = gen;
),
TP_printk("sptep:%p gfn %llx access %x gen %x", __entry->sptep,
__entry->gfn, __entry->access, __entry->gen)
);
TRACE_EVENT(
handle_mmio_page_fault,
TP_PROTO(u64 addr, gfn_t gfn, unsigned access),
TP_ARGS(addr, gfn, access),
TP_STRUCT__entry(
__field(u64, addr)
__field(gfn_t, gfn)
__field(unsigned, access)
),
TP_fast_assign(
__entry->addr = addr;
__entry->gfn = gfn;
__entry->access = access;
),
TP_printk("addr:%llx gfn %llx access %x", __entry->addr, __entry->gfn,
__entry->access)
);
TRACE_EVENT(
fast_page_fault,
TP_PROTO(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u32 error_code,
u64 *sptep, u64 old_spte, int ret),
TP_ARGS(vcpu, cr2_or_gpa, error_code, sptep, old_spte, ret),
TP_STRUCT__entry(
__field(int, vcpu_id)
__field(gpa_t, cr2_or_gpa)
__field(u32, error_code)
__field(u64 *, sptep)
__field(u64, old_spte)
__field(u64, new_spte)
__field(int, ret)
),
TP_fast_assign(
__entry->vcpu_id = vcpu->vcpu_id;
__entry->cr2_or_gpa = cr2_or_gpa;
__entry->error_code = error_code;
__entry->sptep = sptep;
__entry->old_spte = old_spte;
__entry->new_spte = *sptep;
__entry->ret = ret;
),
TP_printk("vcpu %d gva %llx error_code %s sptep %p old %#llx"
" new %llx spurious %d fixed %d", __entry->vcpu_id,
__entry->cr2_or_gpa, __print_flags(__entry->error_code, "|",
kvm_mmu_trace_pferr_flags), __entry->sptep,
__entry->old_spte, __entry->new_spte,
__entry->ret == RET_PF_SPURIOUS, __entry->ret == RET_PF_FIXED
)
);
TRACE_EVENT(
kvm_mmu_zap_all_fast,
TP_PROTO(struct kvm *kvm),
TP_ARGS(kvm),
TP_STRUCT__entry(
__field(__u8, mmu_valid_gen)
__field(unsigned int, mmu_used_pages)
),
TP_fast_assign(
__entry->mmu_valid_gen = kvm->arch.mmu_valid_gen;
__entry->mmu_used_pages = kvm->arch.n_used_mmu_pages;
),
TP_printk("kvm-mmu-valid-gen %u used_pages %x",
__entry->mmu_valid_gen, __entry->mmu_used_pages
)
);
TRACE_EVENT(
check_mmio_spte,
TP_PROTO(u64 spte, unsigned int kvm_gen, unsigned int spte_gen),
TP_ARGS(spte, kvm_gen, spte_gen),
TP_STRUCT__entry(
__field(unsigned int, kvm_gen)
__field(unsigned int, spte_gen)
__field(u64, spte)
),
TP_fast_assign(
__entry->kvm_gen = kvm_gen;
__entry->spte_gen = spte_gen;
__entry->spte = spte;
),
TP_printk("spte %llx kvm_gen %x spte-gen %x valid %d", __entry->spte,
__entry->kvm_gen, __entry->spte_gen,
__entry->kvm_gen == __entry->spte_gen
)
);
TRACE_EVENT(
kvm_mmu_set_spte,
TP_PROTO(int level, gfn_t gfn, u64 *sptep),
TP_ARGS(level, gfn, sptep),
TP_STRUCT__entry(
__field(u64, gfn)
__field(u64, spte)
__field(u64, sptep)
__field(u8, level)
/* These depend on page entry type, so compute them now. */
__field(bool, r)
__field(bool, x)
__field(signed char, u)
),
TP_fast_assign(
__entry->gfn = gfn;
__entry->spte = *sptep;
__entry->sptep = virt_to_phys(sptep);
__entry->level = level;
__entry->r = shadow_present_mask || (__entry->spte & PT_PRESENT_MASK);
__entry->x = is_executable_pte(__entry->spte);
__entry->u = shadow_user_mask ? !!(__entry->spte & shadow_user_mask) : -1;
),
TP_printk("gfn %llx spte %llx (%s%s%s%s) level %d at %llx",
__entry->gfn, __entry->spte,
__entry->r ? "r" : "-",
__entry->spte & PT_WRITABLE_MASK ? "w" : "-",
__entry->x ? "x" : "-",
__entry->u == -1 ? "" : (__entry->u ? "u" : "-"),
__entry->level, __entry->sptep
)
);
TRACE_EVENT(
kvm_mmu_spte_requested,
TP_PROTO(gpa_t addr, int level, kvm_pfn_t pfn),
TP_ARGS(addr, level, pfn),
TP_STRUCT__entry(
__field(u64, gfn)
__field(u64, pfn)
__field(u8, level)
),
TP_fast_assign(
__entry->gfn = addr >> PAGE_SHIFT;
__entry->pfn = pfn | (__entry->gfn & (KVM_PAGES_PER_HPAGE(level) - 1));
__entry->level = level;
),
TP_printk("gfn %llx pfn %llx level %d",
__entry->gfn, __entry->pfn, __entry->level
)
);
#endif /* _TRACE_KVMMMU_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH mmu
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE mmutrace
/* This part must be outside protection */
#include <trace/define_trace.h>
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