From: Sean Christopherson <seanjc@google.com>
Date: Tue, 13 Jul 2021 09:32:41 -0700
Subject: KVM: SVM: Zero out GDTR.base and IDTR.base on INIT
Git-commit: 4f117ce4aefca0e90cd44680219d4c261c1381b9
Patch-mainline: v5.15-rc1
References: bsc#1194644

Explicitly set GDTR.base and IDTR.base to zero when intializing the VMCB.
Functionally this only affects INIT, as the bases are implicitly set to
zero on RESET by virtue of the VMCB being zero allocated.

Per AMD's APM, GDTR.base and IDTR.base are zeroed after RESET and INIT.

Fixes: 04d2cc7780d4 ("KVM: Move main vcpu loop into subarch independent code")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Dario Faggioli <dfaggioli@suse.com>
---
 arch/x86/kvm/svm/svm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 4ce6d827fccd..7845232b6fb6 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1241,7 +1241,9 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
 		SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
 	save->cs.limit = 0xffff;
 
+	save->gdtr.base = 0;
 	save->gdtr.limit = 0xffff;
+	save->idtr.base = 0;
 	save->idtr.limit = 0xffff;
 
 	init_sys_seg(&save->ldtr, SEG_TYPE_LDT);