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Commit caa5b8a5 authored by Eddie Dong's avatar Eddie Dong Committed by Avi Kivity
Browse files

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

arch/x86/kvm/mmu.c

+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