+ Mark On Tue, 20 Dec 2022 10:50:24 +0000, Dong Bo <[email protected]> wrote: > > From: Nianyao Tang <[email protected]> > > If we have VHE and need to reenable SME for host in > kvm_arch_vcpu_put_fp, CPACR.SMEN is modified from 0 to 1. Trap > control for reading SVCR is modified from enable to disable. > Synchronization is needed before reading SVCR later in > fpsimd_save, or it may cause sync exception which can not be > handled by host. > > Cc: Marc Zyngier <[email protected]> > Cc: James Morse <[email protected]> > Cc: Alexandru Elisei <[email protected]> > Cc: Suzuki K Poulose <[email protected]> > Cc: Oliver Upton <[email protected]> > Cc: Catalin Marinas <[email protected]> > Cc: Will Deacon <[email protected]> > Signed-off-by: Nianyao Tang <[email protected]> > --- > arch/arm64/kvm/fpsimd.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c > index 02dd7e9ebd39..f5799f571317 100644 > --- a/arch/arm64/kvm/fpsimd.c > +++ b/arch/arm64/kvm/fpsimd.c > @@ -184,6 +184,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) > sysreg_clear_set(CPACR_EL1, > CPACR_EL1_SMEN_EL0EN, > CPACR_EL1_SMEN_EL1EN); > + isb(); > } > > if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) { > -- > 1.8.3.1 > >
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