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KVM: x86/mmu: Fold rmap_recycle into rmap_add

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Consolidate rmap_recycle and rmap_add into a single function since they
are only ever called together (and only from one place). This has a nice
side effect of eliminating an extra kvm_vcpu_gfn_to_memslot(). In
addition it makes mmu_set_spte(), which is a very long function, a
little shorter.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20210813203504.2742757-3-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Matlack 2021-08-13 20:35:00 +00:00 committed by Paolo Bonzini
parent b1a429fb18
commit 68be1306ca
1 changed files with 14 additions and 26 deletions
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40
arch/x86/kvm/mmu/mmu.c
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@ -1071,20 +1071,6 @@ static bool rmap_can_add(struct kvm_vcpu *vcpu)
return kvm_mmu_memory_cache_nr_free_objects(mc);
}
static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
{
struct kvm_memory_slot *slot;
struct kvm_mmu_page *sp;
struct kvm_rmap_head *rmap_head;
sp = sptep_to_sp(spte);
kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
rmap_head = gfn_to_rmap(gfn, sp->role.level, slot);
return pte_list_add(vcpu, spte, rmap_head);
}
static void rmap_remove(struct kvm *kvm, u64 *spte)
{
struct kvm_memslots *slots;
@ -1097,9 +1083,9 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt);
/*
* Unlike rmap_add and rmap_recycle, rmap_remove does not run in the
* context of a vCPU so have to determine which memslots to use based
* on context information in sp->role.
* Unlike rmap_add, rmap_remove does not run in the context of a vCPU
* so we have to determine which memslots to use based on context
* information in sp->role.
*/
slots = kvm_memslots_for_spte_role(kvm, sp->role);
@ -1639,19 +1625,24 @@ static bool kvm_test_age_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
#define RMAP_RECYCLE_THRESHOLD 1000
static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
{
struct kvm_memory_slot *slot;
struct kvm_rmap_head *rmap_head;
struct kvm_mmu_page *sp;
struct kvm_rmap_head *rmap_head;
int rmap_count;
sp = sptep_to_sp(spte);
kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
rmap_head = gfn_to_rmap(gfn, sp->role.level, slot);
rmap_count = pte_list_add(vcpu, spte, rmap_head);
kvm_unmap_rmapp(vcpu->kvm, rmap_head, NULL, gfn, sp->role.level, __pte(0));
kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
KVM_PAGES_PER_HPAGE(sp->role.level));
if (rmap_count > RMAP_RECYCLE_THRESHOLD) {
kvm_unmap_rmapp(vcpu->kvm, rmap_head, NULL, gfn, sp->role.level, __pte(0));
kvm_flush_remote_tlbs_with_address(
vcpu->kvm, sp->gfn, KVM_PAGES_PER_HPAGE(sp->role.level));
}
}
bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
@ -2713,7 +2704,6 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
bool host_writable)
{
int was_rmapped = 0;
int rmap_count;
int set_spte_ret;
int ret = RET_PF_FIXED;
bool flush = false;
@ -2772,9 +2762,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
if (!was_rmapped) {
kvm_update_page_stats(vcpu->kvm, level, 1);
rmap_count = rmap_add(vcpu, sptep, gfn);
if (rmap_count > RMAP_RECYCLE_THRESHOLD)
rmap_recycle(vcpu, sptep, gfn);
rmap_add(vcpu, sptep, gfn);
}
return ret;