Patch "KVM: arm64: timers: Use CNTHCTL_EL2 when setting non-CNTKCTL_EL1 bits" has been added to the 6.4-stable tree

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This is a note to let you know that I've just added the patch titled

    KVM: arm64: timers: Use CNTHCTL_EL2 when setting non-CNTKCTL_EL1 bits

to the 6.4-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:
     kvm-arm64-timers-use-cnthctl_el2-when-setting-non-cntkctl_el1-bits.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From fe769e6c1f80f542d6f4e7f7c8c6bf20c1307f99 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@xxxxxxxxxx>
Date: Tue, 27 Jun 2023 15:05:57 +0100
Subject: KVM: arm64: timers: Use CNTHCTL_EL2 when setting non-CNTKCTL_EL1 bits

From: Marc Zyngier <maz@xxxxxxxxxx>

commit fe769e6c1f80f542d6f4e7f7c8c6bf20c1307f99 upstream.

It recently appeared that, when running VHE, there is a notable
difference between using CNTKCTL_EL1 and CNTHCTL_EL2, despite what
the architecture documents:

- When accessed from EL2, bits [19:18] and [16:10] of CNTKCTL_EL1 have
  the same assignment as CNTHCTL_EL2
- When accessed from EL1, bits [19:18] and [16:10] are RES0

It is all OK, until you factor in NV, where the EL2 guest runs at EL1.
In this configuration, CNTKCTL_EL11 doesn't trap, nor ends up in
the VNCR page. This means that any write from the guest affecting
CNTHCTL_EL2 using CNTKCTL_EL1 ends up losing some state. Not good.

The fix it obvious: don't use CNTKCTL_EL1 if you want to change bits
that are not part of the EL1 definition of CNTKCTL_EL1, and use
CNTHCTL_EL2 instead. This doesn't change anything for a bare-metal OS,
and fixes it when running under NV. The NV hypervisor will itself
have to work harder to merge the two accessors.

Note that there is a pending update to the architecture to address
this issue by making the affected bits UNKNOWN when CNTKCTL_EL1 is
used from EL2 with VHE enabled.

Fixes: c605ee245097 ("KVM: arm64: timers: Allow physical offset without CNTPOFF_EL2")
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v6.4
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230627140557.544885-1-maz@xxxxxxxxxx
Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/arm64/kvm/arch_timer.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/arm64/kvm/arch_timer.c
+++ b/arch/arm64/kvm/arch_timer.c
@@ -827,8 +827,8 @@ static void timer_set_traps(struct kvm_v
 	assign_clear_set_bit(tpt, CNTHCTL_EL1PCEN << 10, set, clr);
 	assign_clear_set_bit(tpc, CNTHCTL_EL1PCTEN << 10, set, clr);
 
-	/* This only happens on VHE, so use the CNTKCTL_EL1 accessor */
-	sysreg_clear_set(cntkctl_el1, clr, set);
+	/* This only happens on VHE, so use the CNTHCTL_EL2 accessor. */
+	sysreg_clear_set(cnthctl_el2, clr, set);
 }
 
 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
@@ -1559,7 +1559,7 @@ no_vgic:
 void kvm_timer_init_vhe(void)
 {
 	if (cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF))
-		sysreg_clear_set(cntkctl_el1, 0, CNTHCTL_ECV);
+		sysreg_clear_set(cnthctl_el2, 0, CNTHCTL_ECV);
 }
 
 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)


Patches currently in stable-queue which might be from maz@xxxxxxxxxx are

queue-6.4/kvm-arm64-timers-use-cnthctl_el2-when-setting-non-cntkctl_el1-bits.patch
queue-6.4/kvm-arm64-disable-preemption-in-kvm_arch_hardware_enable.patch
queue-6.4/kvm-arm64-correctly-handle-page-aging-notifiers-for-unaligned-memslot.patch
queue-6.4/kvm-arm64-vgic-v4-make-the-doorbell-request-robust-w.r.t-preemption.patch



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