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x86/virt/tdx: Use ida_is_empty() to detect if any TDs may be running

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Drop nr_configured_hkid and instead use ida_is_empty() to detect if any
HKIDs have been allocated/configured.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Tested-by: Chao Gao <chao.gao@intel.com>
Tested-by: Sagi Shahar <sagis@google.com>
Link: https://patch.msgid.link/20260214012702.2368778-15-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-02-13 17:27:00 -08:00
parent eac90a5ba0
commit afe31de159
1 changed files with 4 additions and 13 deletions
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17
arch/x86/virt/vmx/tdx/tdx.c
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@ -59,8 +59,6 @@ static LIST_HEAD(tdx_memlist);
static struct tdx_sys_info tdx_sysinfo __ro_after_init;
static bool tdx_module_initialized __ro_after_init;
static atomic_t nr_configured_hkid;
typedef void (*sc_err_func_t)(u64 fn, u64 err, struct tdx_module_args *args);
static inline void seamcall_err(u64 fn, u64 err, struct tdx_module_args *args)
@ -191,7 +189,7 @@ static int tdx_offline_cpu(unsigned int cpu)
int i;
/* No TD is running. Allow any cpu to be offline. */
if (!atomic_read(&nr_configured_hkid))
if (ida_is_empty(&tdx_guest_keyid_pool))
goto done;
/*
@ -1542,22 +1540,15 @@ EXPORT_SYMBOL_FOR_KVM(tdx_get_nr_guest_keyids);
int tdx_guest_keyid_alloc(void)
{
int ret;
ret = ida_alloc_range(&tdx_guest_keyid_pool, tdx_guest_keyid_start,
tdx_guest_keyid_start + tdx_nr_guest_keyids - 1,
GFP_KERNEL);
if (ret >= 0)
atomic_inc(&nr_configured_hkid);
return ret;
return ida_alloc_range(&tdx_guest_keyid_pool, tdx_guest_keyid_start,
tdx_guest_keyid_start + tdx_nr_guest_keyids - 1,
GFP_KERNEL);
}
EXPORT_SYMBOL_FOR_KVM(tdx_guest_keyid_alloc);
void tdx_guest_keyid_free(unsigned int keyid)
{
ida_free(&tdx_guest_keyid_pool, keyid);
atomic_dec(&nr_configured_hkid);
}
EXPORT_SYMBOL_FOR_KVM(tdx_guest_keyid_free);