Commit 9da0e4d5 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: x86: work on all available address spaces 



This patch has no semantic change, but it prepares for the introduction
of a second address space for system management mode.

A new function x86_set_memory_region (and the "slots_lock taken"
counterpart __x86_set_memory_region) is introduced in order to
operate on all address spaces when adding or deleting private
memory slots.

Reviewed-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 54bf36aa

arch/x86/include/asm/kvm_host.h

+5 −0
Original line number Diff line number Diff line
@@ -1189,4 +1189,9 @@ int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); 
void kvm_handle_pmu_event(struct kvm_vcpu *vcpu);

void kvm_deliver_pmi(struct kvm_vcpu *vcpu);



int __x86_set_memory_region(struct kvm *kvm,

			    const struct kvm_userspace_memory_region *mem);

int x86_set_memory_region(struct kvm *kvm,

			  const struct kvm_userspace_memory_region *mem);



#endif /* _ASM_X86_KVM_HOST_H */

arch/x86/kvm/mmu.c

+46 −38
Original line number Diff line number Diff line
@@ -1503,9 +1503,10 @@ static int kvm_handle_hva_range(struct kvm *kvm, 
	struct kvm_memory_slot *memslot;

	struct slot_rmap_walk_iterator iterator;

	int ret = 0;

	int i;



	slots = kvm_memslots(kvm);



	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {

		slots = __kvm_memslots(kvm, i);

		kvm_for_each_memslot(memslot, slots) {

			unsigned long hva_start, hva_end;

			gfn_t gfn_start, gfn_end;
@@ -1523,11 +1524,13 @@ static int kvm_handle_hva_range(struct kvm *kvm, 
			gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);



			for_each_slot_rmap_range(memslot, PT_PAGE_TABLE_LEVEL,

				PT_MAX_HUGEPAGE_LEVEL, gfn_start, gfn_end - 1,

						 PT_MAX_HUGEPAGE_LEVEL,

						 gfn_start, gfn_end - 1,

						 &iterator)

				ret |= handler(kvm, iterator.rmap, memslot,

					       iterator.gfn, iterator.level, data);

		}

	}



	return ret;

}
@@ -4536,10 +4539,11 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) 
{

	struct kvm_memslots *slots;

	struct kvm_memory_slot *memslot;



	slots = kvm_memslots(kvm);

	int i;



	spin_lock(&kvm->mmu_lock);

	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {

		slots = __kvm_memslots(kvm, i);

		kvm_for_each_memslot(memslot, slots) {

			gfn_t start, end;
@@ -4552,6 +4556,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) 
						PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,

						start, end - 1, true);

		}

	}



	spin_unlock(&kvm->mmu_lock);

}
@@ -4907,11 +4912,14 @@ unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) 
	unsigned int  nr_pages = 0;

	struct kvm_memslots *slots;

	struct kvm_memory_slot *memslot;

	int i;



	slots = kvm_memslots(kvm);

	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {

		slots = __kvm_memslots(kvm, i);



		kvm_for_each_memslot(memslot, slots)

			nr_pages += memslot->npages;

	}



	nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000;

	nr_mmu_pages = max(nr_mmu_pages,

arch/x86/kvm/vmx.c

+3 −3
Original line number Diff line number Diff line
@@ -4115,7 +4115,7 @@ static int alloc_apic_access_page(struct kvm *kvm) 
	kvm_userspace_mem.flags = 0;

	kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE;

	kvm_userspace_mem.memory_size = PAGE_SIZE;

	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem);

	r = __x86_set_memory_region(kvm, &kvm_userspace_mem);

	if (r)

		goto out;
@@ -4150,7 +4150,7 @@ static int alloc_identity_pagetable(struct kvm *kvm) 
	kvm_userspace_mem.guest_phys_addr =

		kvm->arch.ept_identity_map_addr;

	kvm_userspace_mem.memory_size = PAGE_SIZE;

	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem);

	r = __x86_set_memory_region(kvm, &kvm_userspace_mem);



	return r;

}
@@ -4956,7 +4956,7 @@ static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) 
		.flags = 0,

	};



	ret = kvm_set_memory_region(kvm, &tss_mem);

	ret = x86_set_memory_region(kvm, &tss_mem);

	if (ret)

		return ret;

	kvm->arch.tss_addr = addr;

arch/x86/kvm/x86.c

+37 −3
Original line number Diff line number Diff line
@@ -7963,6 +7963,40 @@ void kvm_arch_sync_events(struct kvm *kvm) 
	kvm_free_pit(kvm);

}



int __x86_set_memory_region(struct kvm *kvm,

			    const struct kvm_userspace_memory_region *mem)

{

	int i, r;



	/* Called with kvm->slots_lock held.  */

	BUG_ON(mem->slot >= KVM_MEM_SLOTS_NUM);



	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {

		struct kvm_userspace_memory_region m = *mem;



		m.slot |= i << 16;

		r = __kvm_set_memory_region(kvm, &m);

		if (r < 0)

			return r;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(__x86_set_memory_region);



int x86_set_memory_region(struct kvm *kvm,

			  const struct kvm_userspace_memory_region *mem)

{

	int r;



	mutex_lock(&kvm->slots_lock);

	r = __x86_set_memory_region(kvm, mem);

	mutex_unlock(&kvm->slots_lock);



	return r;

}

EXPORT_SYMBOL_GPL(x86_set_memory_region);



void kvm_arch_destroy_vm(struct kvm *kvm)

{

	if (current->mm == kvm->mm) {
@@ -7974,13 +8008,13 @@ void kvm_arch_destroy_vm(struct kvm *kvm) 
		struct kvm_userspace_memory_region mem;

		memset(&mem, 0, sizeof(mem));

		mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;

		kvm_set_memory_region(kvm, &mem);

		x86_set_memory_region(kvm, &mem);



		mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;

		kvm_set_memory_region(kvm, &mem);

		x86_set_memory_region(kvm, &mem);



		mem.slot = TSS_PRIVATE_MEMSLOT;

		kvm_set_memory_region(kvm, &mem);

		x86_set_memory_region(kvm, &mem);

	}

	kvm_iommu_unmap_guest(kvm);

	kfree(kvm->arch.vpic);

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