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Subject[PATCH 02/27] KVM: MMU: Make tdp_enabled a mmu-context parameter
Date
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: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/mmu.c | 20 ++++++++++++--------
2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9b30285..53cdf39 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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];
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b2136f9..bfb3f23 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -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;
}
@@ -2708,6 +2710,7 @@ 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;
@@ -2747,6 +2750,7 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu)

vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu);
vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu);
+ vcpu->arch.mmu.direct_map = false;

return r;
}
@@ -3060,7 +3064,7 @@ 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);
--
1.7.0.4



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