diff options
| author | Oliver Upton <oliver.upton@linux.dev> | 2023-07-28 00:08:24 +0000 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-07-28 17:11:23 +0000 |
| commit | 74158a8cad79d2f5dcf71508993664c5cfcbfa3c (patch) | |
| tree | 4f41122ca99ab2ee5fa4bebb23e22e3723fd4aba /arch/arm64 | |
| parent | 01b94b0f3922039f7d3e0d1eeb33b8891746b65f (diff) | |
KVM: arm64: Skip instruction after emulating write to TCR_EL1
Whelp, this is embarrassing. Since commit 082fdfd13841 ("KVM: arm64:
Prevent guests from enabling HA/HD on Ampere1") KVM traps writes to
TCR_EL1 on AmpereOne to work around an erratum in the unadvertised
HAFDBS implementation, preventing the guest from enabling the feature.
Unfortunately, I failed virtualization 101 when working on that change,
and forgot to advance PC after instruction emulation.
Do the right thing and skip the MSR instruction after emulating the
write.
Fixes: 082fdfd13841 ("KVM: arm64: Prevent guests from enabling HA/HD on Ampere1")
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230728000824.3848025-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/hyp/include/hyp/switch.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 4bddb8541bec..34f222af6165 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -457,6 +457,7 @@ static bool handle_ampere1_tcr(struct kvm_vcpu *vcpu) */ val &= ~(TCR_HD | TCR_HA); write_sysreg_el1(val, SYS_TCR); + __kvm_skip_instr(vcpu); return true; } |