[PATCH v4 1/8] KVM: arm64: Discard any SVE state when entering KVM guests

[Catalin Marinas]

On Sat, Oct 22, 2022 at 12:03:14AM +0100, Mark Brown wrote:
> Since 8383741ab2e773a99 (KVM: arm64: Get rid of host SVE tracking/saving)
> KVM has not tracked the host SVE state, relying on the fact that we
> currently disable SVE whenever we perform a syscall. This may not be true
> in future since performance optimisation may result in us keeping SVE
> enabled in order to avoid needing to take access traps to reenable it.
> Handle this by clearing TIF_SVE and converting the stored task state to
> FPSIMD format when preparing to run the guest.  This is done with a new
> call fpsimd_kvm_prepare() to keep the direct state manipulation
> functions internal to fpsimd.c.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>