Re: [PATCH 1/8] KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
From: Mark Brown <broonie@kernel.org>
Date: 2025-02-04 15:56:31
Also in:
stable
On Tue, Feb 04, 2025 at 03:20:53PM +0000, Mark Rutland wrote:
There are several problems with the way hyp code lazily saves the host's FPSIMD/SVE state, including:
...
Avoid these by eagerly saving and "flushing" the host's FPSIMD/SVE/SME state when loading a vCPU such that KVM does not need to save any of the host's FPSIMD/SVE/SME state. For clarity, fpsimd_kvm_prepare() is removed and the necessary call to fpsimd_save_and_flush_cpu_state() is placed in kvm_arch_vcpu_load_fp(). As 'fpsimd_state' and 'fpmr_ptr' should not be used, they are set to NULL; all uses of these will be removed in subsequent patches.
This avoid any confusion so Reviewed-by: Mark Brown <broonie@kernel.org>
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