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Commit caa5b8a5 authored by Eddie Dong's avatar Eddie Dong Committed by Avi Kivity
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KVM: MMU: Coalesce remote tlb flushes



Host side TLB flush can be merged together if multiple
spte need to be write-protected.

Signed-off-by: default avatarYaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent ec10f475
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+6 −2
Original line number Diff line number Diff line
@@ -513,6 +513,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
{
	unsigned long *rmapp;
	u64 *spte;
	int write_protected = 0;

	gfn = unalias_gfn(kvm, gfn);
	rmapp = gfn_to_rmap(kvm, gfn);
@@ -522,11 +523,14 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
		BUG_ON(!spte);
		BUG_ON(!(*spte & PT_PRESENT_MASK));
		rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
		if (is_writeble_pte(*spte))
		if (is_writeble_pte(*spte)) {
			set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
		kvm_flush_remote_tlbs(kvm);
			write_protected = 1;
		}
		spte = rmap_next(kvm, rmapp, spte);
	}
	if (write_protected)
		kvm_flush_remote_tlbs(kvm);
}

#ifdef MMU_DEBUG