From: Chao Gao Date: Wed, 20 May 2026 22:29:06 +0000 (-0700) Subject: x86/virt/tdx: Reset software states during TDX module shutdown X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=65a6542a8144cb88ffccae386e38d61933d575c8;p=thirdparty%2Fkernel%2Flinux.git x86/virt/tdx: Reset software states during TDX module shutdown The TDX module requires a one-time global initialization (TDH.SYS.INIT) and per-CPU initialization (TDH.SYS.LP.INIT) before use. These initializations are guarded by software flags to prevent repetition. Reset all software flags guarding the initialization flows to allow the global and per-CPU initializations to be triggered again after updates. [ dhansen: trim down changelog ] Signed-off-by: Chao Gao Signed-off-by: Dave Hansen Reviewed-by: Tony Lindgren Reviewed-by: Kai Huang Reviewed-by: Rick Edgecombe Link: https://patch.msgid.link/20260520133909.409394-18-chao.gao@intel.com --- diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c index 3fe01b546fb8a..37e52cd4a389f 100644 --- a/arch/x86/virt/vmx/tdx/tdx.c +++ b/arch/x86/virt/vmx/tdx/tdx.c @@ -1279,6 +1279,7 @@ int tdx_module_shutdown(void) struct tdx_sys_info_handoff handoff = {}; struct tdx_module_args args = {}; int ret; + int cpu; ret = get_tdx_sys_info_handoff(&handoff); /* @@ -1294,7 +1295,21 @@ int tdx_module_shutdown(void) */ args.rcx = handoff.module_hv; - return seamcall_prerr(TDH_SYS_SHUTDOWN, &args); + ret = seamcall_prerr(TDH_SYS_SHUTDOWN, &args); + if (ret) + return ret; + + /* + * Clear global and per-CPU initialization flags so the new module + * can be fully re-initialized after a successful update. + * + * No locks needed as no concurrent accesses can occur here. + */ + memset(&tdx_module_state, 0, sizeof(tdx_module_state)); + for_each_possible_cpu(cpu) + per_cpu(tdx_lp_initialized, cpu) = false; + + return 0; } static bool is_pamt_page(unsigned long phys)