This is a note to let you know that I've just added the patch titled arm64: KVM: Fix decoding of Rt/Rt2 when trapping AArch32 CP accesses to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-kvm-fix-decoding-of-rt-rt2-when-trapping-aarch32-cp-accesses.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c667186f1c01ca8970c785888868b7ffd74e51ee Mon Sep 17 00:00:00 2001 From: Marc Zyngier <marc.zyngier@xxxxxxx> Date: Thu, 27 Apr 2017 19:06:48 +0100 Subject: arm64: KVM: Fix decoding of Rt/Rt2 when trapping AArch32 CP accesses From: Marc Zyngier <marc.zyngier@xxxxxxx> commit c667186f1c01ca8970c785888868b7ffd74e51ee upstream. Our 32bit CP14/15 handling inherited some of the ARMv7 code for handling the trapped system registers, completely missing the fact that the fields for Rt and Rt2 are now 5 bit wide, and not 4... Let's fix it, and provide an accessor for the most common Rt case. Reviewed-by: Christoffer Dall <cdall@xxxxxxxxxx> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/kvm/sys_regs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1054,8 +1054,8 @@ static int kvm_handle_cp_64(struct kvm_v { struct sys_reg_params params; u32 hsr = kvm_vcpu_get_hsr(vcpu); - int Rt = (hsr >> 5) & 0xf; - int Rt2 = (hsr >> 10) & 0xf; + int Rt = (hsr >> 5) & 0x1f; + int Rt2 = (hsr >> 10) & 0x1f; params.is_aarch32 = true; params.is_32bit = false; @@ -1106,7 +1106,7 @@ static int kvm_handle_cp_32(struct kvm_v { struct sys_reg_params params; u32 hsr = kvm_vcpu_get_hsr(vcpu); - int Rt = (hsr >> 5) & 0xf; + int Rt = (hsr >> 5) & 0x1f; params.is_aarch32 = true; params.is_32bit = true; Patches currently in stable-queue which might be from marc.zyngier@xxxxxxx are queue-4.4/arm64-kvm-fix-decoding-of-rt-rt2-when-trapping-aarch32-cp-accesses.patch queue-4.4/kvm-arm-arm64-fix-races-in-kvm_psci_vcpu_on.patch