[PATCH v19 120/130] KVM: TDX: Add a method to ignore dirty logging

isaku.yamahata
2024-02-26T08:29:14Z

From: Isaku Yamahata <isaku.yamahata@intel.com>

Currently TDX KVM doesn't support tracking dirty pages (yet). Implement a
method to ignore it. Because the flag for kvm memory slot to enable dirty
logging isn't accepted for TDX, warn on the method is called for TDX.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/vmx/main.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 9aaa9bd7abf3..991bfdecaed2 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -834,6 +834,14 @@ static u8 vt_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
return vmx_get_mt_mask(vcpu, gfn, is_mmio);
}

+static void vt_update_cpu_dirty_logging(struct kvm_vcpu *vcpu)
+{
+ if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm))
+ return;
+
+ vmx_update_cpu_dirty_logging(vcpu);
+}
+
static int vt_mem_enc_ioctl(struct kvm *kvm, void __user *argp)
{
if (!is_td(kvm))
@@ -1008,7 +1016,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.sched_in = vt_sched_in,

.cpu_dirty_log_size = PML_ENTITY_NUM,
- .update_cpu_dirty_logging = vmx_update_cpu_dirty_logging,
+ .update_cpu_dirty_logging = vt_update_cpu_dirty_logging,

.nested_ops = &vmx_nested_ops,

--
2.25.1