FAILED: patch "[PATCH] KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any" failed to apply to 4.19-stable tree

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 05a9e065059e566f218f8778c4d17ee75db56c55 Mon Sep 17 00:00:00 2001
From: Like Xu <[email protected]>
Date: Wed, 26 Jan 2022 17:22:26 +0000
Subject: [PATCH] KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any
time

XCR0 is reset to 1 by RESET but not INIT and IA32_XSS is zeroed by both RESET and INIT. The kvm_set_msr_common()'s handling of MSR_IA32_XSS also needs to update kvm_update_cpuid_runtime(). In the above cases, the size in bytes of the XSAVE area containing all states enabled by XCR0 or (XCRO | IA32_XSS) needs to be updated.

For simplicity and consistency, existing helpers are used to write values and call kvm_update_cpuid_runtime(), and it's not exactly a fast path.

Message-Id: <[email protected]>

index 9c984eeed30c..5481d2259f02 100644
@@ -11266,8 +11266,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 
 		vcpu->arch.msr_misc_features_enables = 0;
 
-		vcpu->arch.xcr0 = XFEATURE_MASK_FP;
-		vcpu->arch.ia32_xss = 0;
+		__kvm_set_xcr(vcpu, 0, XFEATURE_MASK_FP);
+		__kvm_set_msr(vcpu, MSR_IA32_XSS, 0, true);
 	}
 
 	/* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */