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Message-ID: <172563937606.2215.16977108983055159109.tip-bot2@tip-bot2> Date: Fri, 06 Sep 2024 16:16:16 -0000 From: "tip-bot2 for Aaron Lu" <tip-bot2@...utronix.de> To: linux-tip-commits@...r.kernel.org Cc: "Molina Sabido, Gerardo" <gerardo.molina.sabido@...el.com>, Aaron Lu <aaron.lu@...el.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Kai Huang <kai.huang@...el.com>, Jarkko Sakkinen <jarkko@...nel.org>, Zhimin Luo <zhimin.luo@...el.com>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: [tip: x86/sgx] x86/sgx: Fix deadlock in SGX NUMA node search The following commit has been merged into the x86/sgx branch of tip: Commit-ID: 9c936844010466535bd46ea4ce4656ef17653644 Gitweb: https://git.kernel.org/tip/9c936844010466535bd46ea4ce4656ef17653644 Author: Aaron Lu <aaron.lu@...el.com> AuthorDate: Thu, 05 Sep 2024 16:08:54 +08:00 Committer: Dave Hansen <dave.hansen@...ux.intel.com> CommitterDate: Thu, 05 Sep 2024 15:20:47 -07:00 x86/sgx: Fix deadlock in SGX NUMA node search When the current node doesn't have an EPC section configured by firmware and all other EPC sections are used up, CPU can get stuck inside the while loop that looks for an available EPC page from remote nodes indefinitely, leading to a soft lockup. Note how nid_of_current will never be equal to nid in that while loop because nid_of_current is not set in sgx_numa_mask. Also worth mentioning is that it's perfectly fine for the firmware not to setup an EPC section on a node. While setting up an EPC section on each node can enhance performance, it is not a requirement for functionality. Rework the loop to start and end on *a* node that has SGX memory. This avoids the deadlock looking for the current SGX-lacking node to show up in the loop when it never will. Fixes: 901ddbb9ecf5 ("x86/sgx: Add a basic NUMA allocation scheme to sgx_alloc_epc_page()") Reported-by: "Molina Sabido, Gerardo" <gerardo.molina.sabido@...el.com> Signed-off-by: Aaron Lu <aaron.lu@...el.com> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> Reviewed-by: Kai Huang <kai.huang@...el.com> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org> Acked-by: Dave Hansen <dave.hansen@...ux.intel.com> Tested-by: Zhimin Luo <zhimin.luo@...el.com> Link: https://lore.kernel.org/all/20240905080855.1699814-2-aaron.lu%40intel.com --- arch/x86/kernel/cpu/sgx/main.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 27892e5..6aeeb43 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -475,24 +475,25 @@ struct sgx_epc_page *__sgx_alloc_epc_page(void) { struct sgx_epc_page *page; int nid_of_current = numa_node_id(); - int nid = nid_of_current; + int nid_start, nid; - if (node_isset(nid_of_current, sgx_numa_mask)) { - page = __sgx_alloc_epc_page_from_node(nid_of_current); - if (page) - return page; - } - - /* Fall back to the non-local NUMA nodes: */ - while (true) { - nid = next_node_in(nid, sgx_numa_mask); - if (nid == nid_of_current) - break; + /* + * Try local node first. If it doesn't have an EPC section, + * fall back to the non-local NUMA nodes. + */ + if (node_isset(nid_of_current, sgx_numa_mask)) + nid_start = nid_of_current; + else + nid_start = next_node_in(nid_of_current, sgx_numa_mask); + nid = nid_start; + do { page = __sgx_alloc_epc_page_from_node(nid); if (page) return page; - } + + nid = next_node_in(nid, sgx_numa_mask); + } while (nid != nid_start); return ERR_PTR(-ENOMEM); }
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