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KVM: arm64: nv: timers: Add a per-timer, per-vcpu offset

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Being able to set a global offset isn't enough.

With NV, we also need to a per-vcpu, per-timer offset (for example,
CNTVCT_EL0 being offset by CNTVOFF_EL2).

Use a similar method as the VM-wide offset to have a timer point
to the shadow register that contains the offset value.

Reviewed-by: Colton Lewis <coltonlewis@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230330174800.2677007-17-maz@kernel.org
This commit is contained in:
Marc Zyngier
2023-03-30 18:47:56 +01:00
parent 1935d34afa
commit 1e0eec09d4
3 changed files with 17 additions and 3 deletions
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13
arch/arm64/kvm/arch_timer.c
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@@ -89,10 +89,17 @@ u64 timer_get_cval(struct arch_timer_context *ctxt)
static u64 timer_get_offset(struct arch_timer_context *ctxt)
{
if (ctxt && ctxt->offset.vm_offset)
return *ctxt->offset.vm_offset;
u64 offset = 0;
return 0;
if (!ctxt)
return 0;
if (ctxt->offset.vm_offset)
offset += *ctxt->offset.vm_offset;
if (ctxt->offset.vcpu_offset)
offset += *ctxt->offset.vcpu_offset;
return offset;
}
static void timer_set_ctl(struct arch_timer_context *ctxt, u32 ctl)