Re: FAILED: patch "[PATCH] KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF" failed to apply to 4.4-stable tree

[Sasha Levin <sashal@kernel.org>]

On Sun, Feb 09, 2020 at 12:58:06PM +0100, gregkh@linuxfoundation.org wrote:
>
>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 <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From 4bf79cb089f6b1c6c632492c0271054ce52ad766 Mon Sep 17 00:00:00 2001
>From: Marios Pomonis <pomonis@google.com>
>Date: Wed, 11 Dec 2019 12:47:46 -0800
>Subject: [PATCH] KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF
> attacks
>
>This fixes a Spectre-v1/L1TF vulnerability in kvm_lapic_reg_write().
>This function contains index computations based on the
>(attacker-controlled) MSR number.
>
>Fixes: 0105d1a52640 ("KVM: x2apic interface to lapic")
>
>Signed-off-by: Nick Finco <nifi@google.com>
>Signed-off-by: Marios Pomonis <pomonis@google.com>
>Reviewed-by: Andrew Honig <ahonig@google.com>
>Cc: stable@vger.kernel.org
>Reviewed-by: Jim Mattson <jmattson@google.com>
>Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

We didn't have 1e6e2755b635 ("KVM: x86: Misc LAPIC changes to expose
helper functions") in 4.4. I've fixed it and queued this patch for 4.4.

-- 
Thanks,
Sasha