Commit c5a78f2b authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: MMU: Make tdp_enabled a mmu-context parameter 



This patch changes the tdp_enabled flag from its global
meaning to the mmu-context and renames it to direct_map
there. This is necessary for Nested SVM with emulation of
Nested Paging where we need an extra MMU context to shadow
the Nested Nested Page Table.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 957446af

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -249,6 +249,7 @@ struct kvm_mmu { 
	int root_level;

	int shadow_root_level;

	union kvm_mmu_page_role base_role;

	bool direct_map;



	u64 *pae_root;

	u64 rsvd_bits_mask[2][4];

arch/x86/kvm/mmu.c

+14 −8
Original line number Diff line number Diff line
@@ -1448,7 +1448,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, 
	if (role.direct)

		role.cr4_pae = 0;

	role.access = access;

	if (!tdp_enabled && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {

	if (!vcpu->arch.mmu.direct_map

	    && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {

		quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));

		quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;

		role.quadrant = quadrant;
@@ -1973,7 +1974,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, 
		spte |= shadow_user_mask;

	if (level > PT_PAGE_TABLE_LEVEL)

		spte |= PT_PAGE_SIZE_MASK;

	if (tdp_enabled)

	if (vcpu->arch.mmu.direct_map)

		spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn,

			kvm_is_mmio_pfn(pfn));
@@ -1983,8 +1984,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, 
	spte |= (u64)pfn << PAGE_SHIFT;



	if ((pte_access & ACC_WRITE_MASK)

	    || (!tdp_enabled && write_fault && !is_write_protection(vcpu)

		&& !user_fault)) {

	    || (!vcpu->arch.mmu.direct_map && write_fault

		&& !is_write_protection(vcpu) && !user_fault)) {



		if (level > PT_PAGE_TABLE_LEVEL &&

		    has_wrprotected_page(vcpu->kvm, gfn, level)) {
@@ -1995,7 +1996,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, 


		spte |= PT_WRITABLE_MASK;



		if (!tdp_enabled && !(pte_access & ACC_WRITE_MASK))

		if (!vcpu->arch.mmu.direct_map

		    && !(pte_access & ACC_WRITE_MASK))

			spte &= ~PT_USER_MASK;



		/*
@@ -2371,7 +2373,7 @@ static int mmu_alloc_roots(struct kvm_vcpu *vcpu) 
		ASSERT(!VALID_PAGE(root));

		if (mmu_check_root(vcpu, root_gfn))

			return 1;

		if (tdp_enabled) {

		if (vcpu->arch.mmu.direct_map) {

			direct = 1;

			root_gfn = 0;

		}
@@ -2406,7 +2408,7 @@ static int mmu_alloc_roots(struct kvm_vcpu *vcpu) 
				return 1;

		} else if (vcpu->arch.mmu.root_level == 0)

			root_gfn = 0;

		if (tdp_enabled) {

		if (vcpu->arch.mmu.direct_map) {

			direct = 1;

			root_gfn = i << 30;

		}
@@ -2544,6 +2546,7 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu) 
	context->root_level = 0;

	context->shadow_root_level = PT32E_ROOT_LEVEL;

	context->root_hpa = INVALID_PAGE;

	context->direct_map = true;

	return 0;

}
@@ -2663,6 +2666,7 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) 
	context->root_level = level;

	context->shadow_root_level = level;

	context->root_hpa = INVALID_PAGE;

	context->direct_map = false;

	return 0;

}
@@ -2687,6 +2691,7 @@ static int paging32_init_context(struct kvm_vcpu *vcpu) 
	context->root_level = PT32_ROOT_LEVEL;

	context->shadow_root_level = PT32E_ROOT_LEVEL;

	context->root_hpa = INVALID_PAGE;

	context->direct_map = false;

	return 0;

}
@@ -2708,6 +2713,7 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) 
	context->invlpg = nonpaging_invlpg;

	context->shadow_root_level = kvm_x86_ops->get_tdp_level();

	context->root_hpa = INVALID_PAGE;

	context->direct_map = true;



	if (!is_paging(vcpu)) {

		context->gva_to_gpa = nonpaging_gva_to_gpa;
@@ -3060,7 +3066,7 @@ int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) 
	gpa_t gpa;

	int r;



	if (tdp_enabled)

	if (vcpu->arch.mmu.direct_map)

		return 0;



	gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL);

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