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Subject[PATCH v2 25/32] KVM: x86/mmu: Use KVM_REQ_TLB_FLUSH_CURRENT for MMU specific flushes
Date
Flush only the current ASID/context when requesting a TLB flush due to a
change in the current vCPU's MMU to avoid blasting away TLB entries
associated with other ASIDs/contexts, e.g. entries cached for L1 when
a change in L2's MMU requires a flush.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/mmu/mmu.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c357cc79f0f3..97d906a42e81 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2313,7 +2313,7 @@ static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
return;

if (local_flush)
- kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}

#ifdef CONFIG_KVM_MMU_AUDIT
@@ -2520,11 +2520,11 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
break;

WARN_ON(!list_empty(&invalid_list));
- kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}

if (sp->unsync_children)
- kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);

__clear_sp_write_flooding_count(sp);
trace_kvm_mmu_get_page(sp, false);
@@ -3125,7 +3125,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
if (set_spte_ret & SET_SPTE_WRITE_PROTECTED_PT) {
if (write_fault)
ret = RET_PF_EMULATE;
- kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}

if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush)
@@ -4314,7 +4314,7 @@ static bool fast_cr3_switch(struct kvm_vcpu *vcpu, gpa_t new_cr3,
kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
if (!skip_tlb_flush) {
kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
- kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
}

/*
@@ -5177,7 +5177,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
if (r)
goto out;
kvm_mmu_load_pgd(vcpu);
- kvm_x86_ops->tlb_flush_all(vcpu);
+ kvm_x86_ops->tlb_flush_current(vcpu);
out:
return r;
}
--
2.24.1
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