linux-kernel - Re: [PATCH v9 06/22] x86/cea: Export __this_cpu_ist_top

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Message-ID: <c6a006dd-1ad4-4bd7-a21e-5ae9b1aa688f@intel.com>
Date: Mon, 27 Oct 2025 08:50:01 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Xin Li (Intel)" <xin@...or.com>, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org, linux-doc@...r.kernel.org
Cc: pbonzini@...hat.com, seanjc@...gle.com, corbet@....net,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, luto@...nel.org,
 peterz@...radead.org, andrew.cooper3@...rix.com, chao.gao@...el.com,
 hch@...radead.org, sohil.mehta@...el.com
Subject: Re: [PATCH v9 06/22] x86/cea: Export __this_cpu_ist_top_va() to KVM

On 10/26/25 13:18, Xin Li (Intel) wrote:
> Export __this_cpu_ist_top_va() to allow KVM to retrieve the per-CPU
> exception stack top.
> 
> 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.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>