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kvm: x86: Make sync_page() flush remote TLBs once only

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sync_page() calls set_spte() from a loop across a page table. It would
work better if set_spte() left the TLB flushing to its callers, so that
sync_page() can aggregate into a single call.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Junaid Shahid
2018-06-27 14:59:04 -07:00
committed by Paolo Bonzini
parent 42522d08cd
commit 5ce4786f75
2 changed files with 20 additions and 8 deletions
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12
arch/x86/kvm/paging_tmpl.h
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@@ -968,6 +968,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
int i, nr_present = 0;
bool host_writable;
gpa_t first_pte_gpa;
int set_spte_ret = 0;
/* direct kvm_mmu_page can not be unsync. */
BUG_ON(sp->role.direct);
@@ -1024,12 +1025,15 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
host_writable = sp->spt[i] & SPTE_HOST_WRITEABLE;
set_spte(vcpu, &sp->spt[i], pte_access,
PT_PAGE_TABLE_LEVEL, gfn,
spte_to_pfn(sp->spt[i]), true, false,
host_writable);
set_spte_ret |= set_spte(vcpu, &sp->spt[i],
pte_access, PT_PAGE_TABLE_LEVEL,
gfn, spte_to_pfn(sp->spt[i]),
true, false, host_writable);
}
if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH)
kvm_flush_remote_tlbs(vcpu->kvm);
return nr_present;
}