linux-kernel - [PATCH v2 0/3] LoongArch: KVM: Add FPU delay load support

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Message-Id: <20260127125124.3234252-1-maobibo@loongson.cn>
Date: Tue, 27 Jan 2026 20:51:21 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: [PATCH v2 0/3] LoongArch: KVM: Add FPU delay load support

FPU is lazy enabled in KVM hypervisor. After FPU is enabled and loaded,
vCPU can be preempted and FPU will be lost, there will be FPU exception
and FPU load again.

Here FPU is delay load until guest enter entry.

---
v1 ... v2:
  1. Keep funtion trace_kvm_aux() with FPU restore called still, only
     remove preempt disable/enable API call.
  2. Use one KVM_REQ_FPU_LOAD request bit and add fpu_load_type int
     type, remove KVM_REQ_LSX_LOAD/KVM_REQ_LASX_LOAD request bit
---
Bibo Mao (3):
  LoongArch: KVM: Move LSX capability check in LSX exception handler
  LoongArch: KVM: Move LASX capability check in LASX exception handler
  LoongArch: KVM: Add FPU delay load support

 arch/loongarch/include/asm/kvm_host.h |  2 ++
 arch/loongarch/kvm/exit.c             | 15 ++++++++---
 arch/loongarch/kvm/vcpu.c             | 39 ++++++++++++++-------------
 3 files changed, 35 insertions(+), 21 deletions(-)


base-commit: fcb70a56f4d81450114034b2c61f48ce7444a0e2
-- 
2.39.3