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KVM: TDX: Don't copy "cmd" back to userspace for KVM_TDX_CAPABILITIES

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Don't copy the kvm_tdx_cmd structure back to userspace when handling
KVM_TDX_CAPABILITIES, as tdx_get_capabilities() doesn't modify hw_error or
any other fields.

Opportunistically hoist the call to tdx_get_capabilities() outside of the
kvm->lock critical section, as getting the capabilities doesn't touch the
VM in any way, e.g. doesn't even take @kvm.

Suggested-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251030200951.3402865-26-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-10-30 13:09:48 -07:00
parent 0b76e827b2
commit f26061fe2c
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/vmx/tdx.c
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@@ -2816,12 +2816,12 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
if (r)
return r;
if (tdx_cmd.id == KVM_TDX_CAPABILITIES)
return tdx_get_capabilities(&tdx_cmd);
guard(mutex)(&kvm->lock);
switch (tdx_cmd.id) {
case KVM_TDX_CAPABILITIES:
r = tdx_get_capabilities(&tdx_cmd);
break;
case KVM_TDX_INIT_VM:
r = tdx_td_init(kvm, &tdx_cmd);
break;