Re: [PATCH 6.18 000/315] 6.18.35-rc1 review

[Miguel Ojeda]

On Sun, 07 Jun 2026 11:56:27 +0200 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> This is the start of the stable review cycle for the 6.18.35 release.
> There are 315 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Tue, 09 Jun 2026 09:56:45 +0000.
> Anything received after that time might be too late.

Boot-tested under QEMU for Rust x86_64, arm64 and riscv64; built-tested
for loongarch64:

Tested-by: Miguel Ojeda <ojeda@xxxxxxxxxx>

arm32 builds fine too.

However, on arm64 I am seeing:

    arch/arm64/kvm/nested.c:1776:2: error: use of undeclared identifier 'resx'
     1776 |         resx.res0 = ZCR_ELx_RES0 | GENMASK_ULL(8, 4);
          |         ^
    arch/arm64/kvm/nested.c:1777:2: error: use of undeclared identifier 'resx'
     1777 |         resx.res1 = ZCR_ELx_RES1;
          |         ^
    arch/arm64/kvm/nested.c:1778:33: error: use of undeclared identifier 'resx'
     1778 |         set_sysreg_masks(kvm, ZCR_EL2, resx);
          |                                        ^

Due to commit 10206eaad1b9 ("KVM: arm64: Correctly cap ZCR_EL2 provided
by a guest hypervisor") here.

`resx` indeed doesn't exist, and it seems like it was added by commits
0879478913dd ("KVM: arm64: Introduce data structure tracking both RES0
and RES1 bits") etc., which are in 7.0, from this series:

  https://lore.kernel.org/all/20260202184329.2724080-1-maz@xxxxxxxxxx/

So either we make a targeted backport or backport some commits, no?

I hope that help!

Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Joey Gouly <joey.gouly@xxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Oliver Upton <oupton@xxxxxxxxxx>
Cc: Zenghui Yu <yuzenghui@xxxxxxxxxx>
Cc: Fuad Tabba <tabba@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Steffen Eiden <seiden@xxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: kvmarm@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx

Cheers,
Miguel