From 860c713d3914269d434020368f17ecd0d6b73d79 Mon Sep 17 00:00:00 2001 From: Lai Jiangshan Date: Wed, 24 Nov 2021 20:20:43 +0800 Subject: [PATCH] KVM: X86: Fix when shadow_root_level=5 && guest root_level<4 BugLink: https://bugs.launchpad.net/bugs/1953731 [ Upstream commit 12ec33a705749e18d9588b0a0e69e02821371156 ] If the is an L1 with nNPT in 32bit, the shadow walk starts with pae_root. Fixes: a717a780fc4e ("KVM: x86/mmu: Support shadowing NPT when 5-level paging is enabled in host) Signed-off-by: Lai Jiangshan Message-Id: <20211124122055.64424-2-jiangshanlai@gmail.com> Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin Signed-off-by: Paolo Pisati --- arch/x86/kvm/mmu/mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index c9b1d63d3cfb..287fc1086db7 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -2188,10 +2188,10 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato iterator->shadow_addr = root; iterator->level = vcpu->arch.mmu->shadow_root_level; - if (iterator->level == PT64_ROOT_4LEVEL && + if (iterator->level >= PT64_ROOT_4LEVEL && vcpu->arch.mmu->root_level < PT64_ROOT_4LEVEL && !vcpu->arch.mmu->direct_map) - --iterator->level; + iterator->level = PT32E_ROOT_LEVEL; if (iterator->level == PT32E_ROOT_LEVEL) { /* -- 2.39.5