From: Liang Chen <liangchen.linux@gmail.com>
Date: Wed, 25 Jul 2018 08:32:14 +0000 (+0800)
Subject: KVM: x86: Skip pae_root shadow allocation if tdp enabled
X-Git-Tag: v4.19-rc1~87^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ee6268ba3a6861b2806e569bff7fe91fbdf846dd;p=thirdparty%2Fkernel%2Flinux.git

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>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8f216321d33b2..f5aef52b148bf 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