diff options
| author | Marc Zyngier <maz@kernel.org> | 2024-12-17 14:23:17 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-01-02 19:19:10 +0000 |
| commit | 479428cc3dc99bbe28954b62b053b22accbfd1fd (patch) | |
| tree | d591ed0fab7c9979629f62f89a468c266d3098bb | |
| parent | c271269e3570766724820bcb76a144125dead272 (diff) | |
KVM: arm64: nv: Propagate CNTHCTL_EL2.EL1NV{P,V}CT bits
Allow a guest hypervisor to trap accesses to CNT{P,V}CT_EL02 by
propagating these trap bits to the host trap configuration.
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241217142321.763801-10-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
| -rw-r--r-- | arch/arm64/kvm/arch_timer.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c index 6f04f31c0a7f..e5951e6eaf23 100644 --- a/arch/arm64/kvm/arch_timer.c +++ b/arch/arm64/kvm/arch_timer.c @@ -824,6 +824,10 @@ static void timer_set_traps(struct kvm_vcpu *vcpu, struct timer_map *map) * Apply the enable bits that the guest hypervisor has requested for * its own guest. We can only add traps that wouldn't have been set * above. + * Implementation choices: we do not support NV when E2H=0 in the + * guest, and we don't support configuration where E2H is writable + * by the guest (either FEAT_VHE or FEAT_E2H0 is implemented, but + * not both). This simplifies the handling of the EL1NV* bits. */ if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) { u64 val = __vcpu_sys_reg(vcpu, CNTHCTL_EL2); @@ -834,6 +838,9 @@ static void timer_set_traps(struct kvm_vcpu *vcpu, struct timer_map *map) tpt |= !(val & (CNTHCTL_EL1PCEN << 10)); tpc |= !(val & (CNTHCTL_EL1PCTEN << 10)); + + tpt02 |= (val & CNTHCTL_EL1NVPCT); + tvt02 |= (val & CNTHCTL_EL1NVVCT); } /* |