diff options
| author | Shaoqin Huang <shahuang@redhat.com> | 2024-07-23 09:20:02 +0200 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-08-25 18:48:44 +0200 |
| commit | 78c4446b5f957fb14737582e503b1b25f66edc45 (patch) | |
| tree | c4554cd7d2da606570010384e9bb7e42269376c0 /arch/arm64/kvm | |
| parent | KVM: arm64: Use kvm_has_feat() to check if FEAT_SSBS is advertised to the guest (diff) | |
| download | linux-78c4446b5f957fb14737582e503b1b25f66edc45.tar.xz linux-78c4446b5f957fb14737582e503b1b25f66edc45.zip | |
KVM: arm64: Allow userspace to change ID_AA64PFR1_EL1
Allow userspace to change the guest-visible value of the register with
different way of handling:
- Since the RAS and MPAM is not writable in the ID_AA64PFR0_EL1
register, RAS_frac and MPAM_frac are also not writable in the
ID_AA64PFR1_EL1 register.
- The MTE is controlled by a separate UAPI (KVM_CAP_ARM_MTE) with an
internal flag (KVM_ARCH_FLAG_MTE_ENABLED).
So it's not writable.
- For those fields which KVM doesn't know how to handle, they are not
exposed to the guest (being disabled in the register read accessor),
those fields value will always be 0.
Those fields don't have a known behavior now, so don't advertise
them to the userspace. Thus still not writable.
Those fields include SME, RNDR_trap, NMI, GCS, THE, DF2, PFAR,
MTE_frac, MTEX.
- The BT, SSBS, CSV2_frac don't introduce any new registers which KVM
doesn't know how to handle, they can be written without ill effect.
So let them writable.
Besides, we don't do the crosscheck in KVM about the CSV2_frac even if
it depends on the value of CSV2, it should be made sure by the VMM
instead of KVM.
Signed-off-by: Shaoqin Huang <shahuang@redhat.com>
Link: https://lore.kernel.org/r/20240723072004.1470688-4-shahuang@redhat.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 0d983c1b859b..da7b8e078b20 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2370,7 +2370,19 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_AA64PFR0_EL1_GIC | ID_AA64PFR0_EL1_AdvSIMD | ID_AA64PFR0_EL1_FP), }, - ID_SANITISED(ID_AA64PFR1_EL1), + ID_WRITABLE(ID_AA64PFR1_EL1, ~(ID_AA64PFR1_EL1_PFAR | + ID_AA64PFR1_EL1_DF2 | + ID_AA64PFR1_EL1_MTEX | + ID_AA64PFR1_EL1_THE | + ID_AA64PFR1_EL1_GCS | + ID_AA64PFR1_EL1_MTE_frac | + ID_AA64PFR1_EL1_NMI | + ID_AA64PFR1_EL1_RNDR_trap | + ID_AA64PFR1_EL1_SME | + ID_AA64PFR1_EL1_RES0 | + ID_AA64PFR1_EL1_MPAM_frac | + ID_AA64PFR1_EL1_RAS_frac | + ID_AA64PFR1_EL1_MTE)), ID_UNALLOCATED(4,2), ID_UNALLOCATED(4,3), ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), |