From: Peter Zijlstra <peterz@infradead.org>
To: "Xin Li (Intel)" <xin@zytor.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, pbonzini@redhat.com,
seanjc@google.com, corbet@lwn.net, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, luto@kernel.org,
andrew.cooper3@citrix.com, chao.gao@intel.com, hch@infradead.org
Subject: Re: [PATCH v8 05/21] x86/cea: Export API for per-CPU exception stacks for KVM
Date: Thu, 23 Oct 2025 10:06:27 +0200 [thread overview]
Message-ID: <20251023080627.GV3245006@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20251014010950.1568389-6-xin@zytor.com>
On Mon, Oct 13, 2025 at 06:09:34PM -0700, Xin Li (Intel) wrote:
> FRED introduced new fields in the host-state area of the VMCS for stack
> levels 1->3 (HOST_IA32_FRED_RSP[123]), each respectively corresponding to
> per-CPU exception stacks for #DB, NMI and #DF. KVM must populate these
> fields each time a vCPU is loaded onto a CPU.
> +noinstr unsigned long __this_cpu_ist_top_va(enum exception_stack_ordering stack)
> +{
> + return __this_cpu_ist_bottom_va(stack) + EXCEPTION_STKSZ;
> +}
> +EXPORT_SYMBOL(__this_cpu_ist_top_va);
This has no business being a !GPL export. But please use:
EXPORT_SYMBOL_FOR_MODULES(__this_cpu_ist_top_val, "kvm");
(or "kvm-intel", depending on which actual module ends up needing this
symbol).
next prev parent reply other threads:[~2025-10-23 8:06 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-14 1:09 [PATCH v8 00/21] Enable FRED with KVM VMX Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 01/21] KVM: VMX: Add support for the secondary VM exit controls Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 02/21] KVM: VMX: Initialize VM entry/exit FRED controls in vmcs_config Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 03/21] KVM: VMX: Disable FRED if FRED consistency checks fail Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 04/21] x86/cea: Prefix event stack names with ESTACK_ Xin Li (Intel)
2025-10-23 14:20 ` Dave Hansen
2025-10-14 1:09 ` [PATCH v8 05/21] x86/cea: Export API for per-CPU exception stacks for KVM Xin Li (Intel)
2025-10-23 1:20 ` Xin Li
2025-10-23 8:06 ` Peter Zijlstra [this message]
2025-10-23 8:55 ` Xin Li
2025-10-23 14:08 ` Sean Christopherson
2025-10-23 14:15 ` Peter Zijlstra
2025-10-23 15:03 ` Dave Hansen
2025-10-14 1:09 ` [PATCH v8 06/21] KVM: VMX: Initialize VMCS FRED fields Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 07/21] KVM: VMX: Set FRED MSR intercepts Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 08/21] KVM: VMX: Save/restore guest FRED RSP0 Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 09/21] KVM: VMX: Add support for saving and restoring FRED MSRs Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 10/21] KVM: x86: Add a helper to detect if FRED is enabled for a vCPU Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 11/21] KVM: VMX: Virtualize FRED event_data Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 12/21] KVM: VMX: Virtualize FRED nested exception tracking Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 13/21] KVM: x86: Save/restore the nested flag of an exception Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 14/21] KVM: x86: Mark CR4.FRED as not reserved Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 15/21] KVM: VMX: Dump FRED context in dump_vmcs() Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 16/21] KVM: x86: Advertise support for FRED Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 17/21] KVM: nVMX: Add support for the secondary VM exit controls Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 18/21] KVM: nVMX: Add FRED VMCS fields to nested VMX context handling Xin Li (Intel)
2025-10-14 6:57 ` Chao Gao
2025-10-14 7:49 ` Xin Li
2025-10-22 23:10 ` Xin Li
2025-10-14 1:09 ` [PATCH v8 19/21] KVM: nVMX: Add FRED-related VMCS field checks Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 20/21] KVM: nVMX: Add prerequisites to SHADOW_FIELD_R[OW] macros Xin Li (Intel)
2025-10-14 1:09 ` [PATCH v8 21/21] KVM: nVMX: Allow VMX FRED controls Xin Li (Intel)
2025-10-14 6:13 ` [syzbot ci] Re: Enable FRED with KVM VMX syzbot ci
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