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Date: Fri, 24 Sep 2021 12:31:52 -0400
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: dmatlack@...gle.com, seanjc@...gle.com
Subject: [PATCH v3 31/31] KVM: MMU: make spte an in-out argument in make_spte
Pass the old SPTE in the same variable that receives the new SPTE. This
reduces the number of arguments from 11 to 10.
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
arch/x86/kvm/mmu/mmu.c | 18 ++++++++----------
arch/x86/kvm/mmu/paging_tmpl.h | 2 +-
arch/x86/kvm/mmu/spte.c | 7 ++++---
arch/x86/kvm/mmu/spte.h | 2 +-
arch/x86/kvm/mmu/tdp_mmu.c | 9 +++++----
5 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 91292009780a..b363433bcd2c 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2682,8 +2682,8 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
int was_rmapped = 0;
int ret = RET_PF_FIXED;
bool flush = false;
+ u64 spte = *sptep;
bool wrprot;
- u64 spte;
/* Prefetching always gets a writable pfn. */
bool host_writable = !fault || fault->map_writable;
@@ -2691,35 +2691,33 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
bool write_fault = fault && fault->write;
pgprintk("%s: spte %llx write_fault %d gfn %llx\n", __func__,
- *sptep, write_fault, gfn);
+ spte, write_fault, gfn);
if (unlikely(is_noslot_pfn(pfn))) {
mark_mmio_spte(vcpu, sptep, gfn, pte_access);
return RET_PF_EMULATE;
}
- if (is_shadow_present_pte(*sptep)) {
+ if (is_shadow_present_pte(spte)) {
/*
* If we overwrite a PTE page pointer with a 2MB PMD, unlink
* the parent of the now unreachable PTE.
*/
- if (level > PG_LEVEL_4K && !is_large_pte(*sptep)) {
+ if (level > PG_LEVEL_4K && !is_large_pte(spte)) {
struct kvm_mmu_page *child;
- u64 pte = *sptep;
-
- child = to_shadow_page(pte & PT64_BASE_ADDR_MASK);
+ child = to_shadow_page(spte & PT64_BASE_ADDR_MASK);
drop_parent_pte(child, sptep);
flush = true;
- } else if (pfn != spte_to_pfn(*sptep)) {
+ } else if (pfn != spte_to_pfn(spte)) {
pgprintk("hfn old %llx new %llx\n",
- spte_to_pfn(*sptep), pfn);
+ spte_to_pfn(spte), pfn);
drop_spte(vcpu->kvm, sptep);
flush = true;
} else
was_rmapped = 1;
}
- wrprot = make_spte(vcpu, sp, slot, pte_access, gfn, pfn, *sptep, speculative,
+ wrprot = make_spte(vcpu, sp, slot, pte_access, gfn, pfn, speculative,
true, host_writable, &spte);
if (*sptep == spte) {
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index d8889e02c4b7..88551cfd06c6 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -1130,7 +1130,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
host_writable = spte & shadow_host_writable_mask;
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
make_spte(vcpu, sp, slot, pte_access, gfn,
- spte_to_pfn(spte), spte, true, false,
+ spte_to_pfn(spte), true, false,
host_writable, &spte);
flush |= mmu_spte_update(sptep, spte);
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index 871f6114b0fa..91525388032e 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -92,10 +92,11 @@ static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct kvm_memory_slot *slot,
unsigned int pte_access, gfn_t gfn, kvm_pfn_t pfn,
- u64 old_spte, bool speculative, bool can_unsync,
- bool host_writable, u64 *new_spte)
+ bool speculative, bool can_unsync,
+ bool host_writable, u64 *sptep)
{
int level = sp->role.level;
+ u64 old_spte = *sptep;
u64 spte = SPTE_MMU_PRESENT_MASK;
bool wrprot = false;
@@ -187,7 +188,7 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
mark_page_dirty_in_slot(vcpu->kvm, slot, gfn);
}
- *new_spte = spte;
+ *sptep = spte;
return wrprot;
}
diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h
index 7c0b09461349..231531c6015a 100644
--- a/arch/x86/kvm/mmu/spte.h
+++ b/arch/x86/kvm/mmu/spte.h
@@ -337,7 +337,7 @@ static inline u64 get_mmio_spte_generation(u64 spte)
bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct kvm_memory_slot *slot,
unsigned int pte_access, gfn_t gfn, kvm_pfn_t pfn,
- u64 old_spte, bool speculative, bool can_unsync,
+ bool speculative, bool can_unsync,
bool host_writable, u64 *new_spte);
u64 make_nonleaf_spte(u64 *child_pt, bool ad_disabled);
u64 make_mmio_spte(struct kvm_vcpu *vcpu, u64 gfn, unsigned int access);
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 953f24ded6bc..29b739c7bba4 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -903,13 +903,14 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
bool wrprot = false;
WARN_ON(sp->role.level != fault->goal_level);
- if (unlikely(!fault->slot))
+ if (unlikely(!fault->slot)) {
new_spte = make_mmio_spte(vcpu, iter->gfn, ACC_ALL);
- else
+ } else {
+ new_spte = iter->old_spte;
wrprot = make_spte(vcpu, sp, fault->slot, ACC_ALL, iter->gfn,
- fault->pfn, iter->old_spte, fault->prefault, true,
+ fault->pfn, fault->prefault, true,
fault->map_writable, &new_spte);
-
+ }
if (new_spte == iter->old_spte)
ret = RET_PF_SPURIOUS;
else if (!tdp_mmu_set_spte_atomic(vcpu->kvm, iter, new_spte))
--
2.27.0
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