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KVM: x86/mmu: Move TDP MMU VM init/uninit behind tdp_mmu_enabled

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Move kvm_mmu_{init,uninit}_tdp_mmu() behind tdp_mmu_enabled. This makes
these functions consistent with the rest of the calls into the TDP MMU
from mmu.c, and which is now possible since tdp_mmu_enabled is only
modified when the x86 vendor module is loaded. i.e. It will never change
during the lifetime of a VM.

This change also enabled removing the stub definitions for 32-bit KVM,
as the compiler will just optimize the calls out like it does for all
the other TDP MMU functions.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
Reviewed-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220921173546.2674386-3-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Matlack 2022-09-21 10:35:38 -07:00 committed by Paolo Bonzini
parent 3af15ff47c
commit 991c8047b7
3 changed files with 10 additions and 14 deletions
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11
arch/x86/kvm/mmu/mmu.c
View File

@ -6035,9 +6035,11 @@ int kvm_mmu_init_vm(struct kvm *kvm)
INIT_LIST_HEAD(&kvm->arch.possible_nx_huge_pages);
spin_lock_init(&kvm->arch.mmu_unsync_pages_lock);
r = kvm_mmu_init_tdp_mmu(kvm);
if (r < 0)
return r;
if (tdp_mmu_enabled) {
r = kvm_mmu_init_tdp_mmu(kvm);
if (r < 0)
return r;
}
node->track_write = kvm_mmu_pte_write;
node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot;
@ -6067,7 +6069,8 @@ void kvm_mmu_uninit_vm(struct kvm *kvm)
kvm_page_track_unregister_notifier(kvm, node);
kvm_mmu_uninit_tdp_mmu(kvm);
if (tdp_mmu_enabled)
kvm_mmu_uninit_tdp_mmu(kvm);
mmu_free_vm_memory_caches(kvm);
}

6
arch/x86/kvm/mmu/tdp_mmu.c
View File

@ -15,9 +15,6 @@ int kvm_mmu_init_tdp_mmu(struct kvm *kvm)
{
struct workqueue_struct *wq;
if (!tdp_mmu_enabled)
return 0;
wq = alloc_workqueue("kvm", WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 0);
if (!wq)
return -ENOMEM;
@ -42,9 +39,6 @@ static __always_inline bool kvm_lockdep_assert_mmu_lock_held(struct kvm *kvm,
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm)
{
if (!tdp_mmu_enabled)
return;
/* Also waits for any queued work items. */
destroy_workqueue(kvm->arch.tdp_mmu_zap_wq);

7
arch/x86/kvm/mmu/tdp_mmu.h
View File

@ -7,6 +7,9 @@
#include "spte.h"
int kvm_mmu_init_tdp_mmu(struct kvm *kvm);
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);
hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
__must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root)
@ -68,8 +71,6 @@ u64 *kvm_tdp_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, u64 addr,
u64 *spte);
#ifdef CONFIG_X86_64
int kvm_mmu_init_tdp_mmu(struct kvm *kvm);
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);
static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu_page; }
static inline bool is_tdp_mmu(struct kvm_mmu *mmu)
@ -89,8 +90,6 @@ static inline bool is_tdp_mmu(struct kvm_mmu *mmu)
return sp && is_tdp_mmu_page(sp) && sp->root_count;
}
#else
static inline int kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return 0; }
static inline void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) {}
static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return false; }
static inline bool is_tdp_mmu(struct kvm_mmu *mmu) { return false; }
#endif