KVM: x86: Skip pae_root shadow allocation if tdp enabled

Considering the fact that the pae_root shadow is not needed when
tdp is in use, skip the pae_root shadow page allocation to allow
mmu creation even not being able to obtain memory from DMA32
zone when particular cgroup cpuset.mems or mempolicy control is
applied.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8f216321d33b..f5aef52b148b 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5341,6 +5341,9 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
         struct page *page;
         int i;
 
+        if (tdp_enabled)
+                return 0;
+
         /*
          * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
          * Therefore we need to allocate shadow page tables in the first