FAILED: patch "[PATCH] KVM: VMX: Truncate GPR value for DR and CR reads in !64-bit" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-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 d8971344f5739a9cc53f91f1f593ddd82265b93b Mon Sep 17 00:00:00 2001
From: Sean Christopherson <[email protected]>
Date: Wed, 21 Apr 2021 19:21:23 -0700
Subject: [PATCH] KVM: VMX: Truncate GPR value for DR and CR reads in !64-bit
mode

Drop bits 63:32 when storing a DR/CR to a GPR when the vCPU is not in 64-bit mode. Per the SDM:

The operand size for these instructions is always 32 bits in non-64-bit modes, regardless of the operand-size attribute.

CR8 technically isn't affected as CR8 isn't accessible outside of 64-bit mode, but fix it up for consistency and to allow for future cleanup.

Message-Id: <[email protected]>

index edc23c77be32..64354b009fe0 100644
@@ -5121,12 +5121,12 @@ static int handle_cr(struct kvm_vcpu *vcpu)
 		case 3:
 			WARN_ON_ONCE(enable_unrestricted_guest);
 			val = kvm_read_cr3(vcpu);
-			kvm_register_write(vcpu, reg, val);
+			kvm_register_writel(vcpu, reg, val);
 			trace_kvm_cr_read(cr, val);
 			return kvm_skip_emulated_instruction(vcpu);
 		case 8:
 			val = kvm_get_cr8(vcpu);
-			kvm_register_write(vcpu, reg, val);
+			kvm_register_writel(vcpu, reg, val);
 			trace_kvm_cr_read(cr, val);
 			return kvm_skip_emulated_instruction(vcpu);
 		}

@@ -5199,7 +5199,7 @@ static int handle_dr(struct kvm_vcpu *vcpu)
 		unsigned long val;
 
 		kvm_get_dr(vcpu, dr, &val);
-		kvm_register_write(vcpu, reg, val);
+		kvm_register_writel(vcpu, reg, val);
 		err = 0;
 	} else {
 		err = kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg));