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FAILED: patch "[PATCH] KVM: nVMX: Always sync GUEST_BNDCFGS when it comes from" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message Jul 23, 2019

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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 3b013a2972d5bc344d6eaa8f24fdfe268211e45f Mon Sep 17 00:00:00 2001
From: Sean Christopherson <[email protected]>
Date: Tue, 7 May 2019 09:06:28 -0700
Subject: [PATCH] KVM: nVMX: Always sync GUEST_BNDCFGS when it comes from
vmcs01

If L1 does not set VM_ENTRY_LOAD_BNDCFGS, then L1's BNDCFGS value must be propagated to vmcs02 since KVM always runs with VM_ENTRY_LOAD_BNDCFGS when MPX is supported. Because the value effectively comes from vmcs01, vmcs02 must be updated even if vmcs12 is clean.

Fixes 62cf9bd8118c4 ("KVM: nVMX: Fix emulation of VM_ENTRY_LOAD_BNDCFGS")
Cc [email protected]
Cc Liran Alon <[email protected]>
Signed-off-by Sean Christopherson <[email protected]>
Signed-off-by Paolo Bonzini <[email protected]>
arch/x86/kvm/vmx/nested.c +6 -7
index 6e82bbca2fe1..c4c0a45245b2 100644
@@ -2228,13 +2228,9 @@ static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
 
 	set_cr4_guest_host_mask(vmx);
 
-	if (kvm_mpx_supported()) {
-		if (vmx->nested.nested_run_pending &&
-			(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
-			vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
-		else
-			vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs);
-	}
+	if (kvm_mpx_supported() && vmx->nested.nested_run_pending &&
+	    (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
+		vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
 }
 
 /*

@@ -2266,6 +2262,9 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 		kvm_set_dr(vcpu, 7, vcpu->arch.dr7);
 		vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.vmcs01_debugctl);
 	}
+	if (kvm_mpx_supported() && (!vmx->nested.nested_run_pending ||
+	    !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)))
+		vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs);
 	vmx_set_rflags(vcpu, vmcs12->guest_rflags);
 
 	/* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the