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KVM: arm64: nv: Load guest hyp's ZCR into EL1 state

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Load the guest hypervisor's ZCR_EL2 into the corresponding EL1 register
when restoring SVE state, as ZCR_EL2 affects the VL in the hypervisor
context.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-5-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-06-20 16:46:41 +00:00
parent b3d29a8230
commit 069da3ffda
2 changed files with 5 additions and 1 deletions
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3
arch/arm64/include/asm/kvm_host.h
View File

@ -868,6 +868,9 @@ struct kvm_vcpu_arch {
#define vcpu_sve_max_vq(vcpu) sve_vq_from_vl((vcpu)->arch.sve_max_vl)
#define vcpu_sve_zcr_elx(vcpu) \
(unlikely(is_hyp_ctxt(vcpu)) ? ZCR_EL2 : ZCR_EL1)
#define vcpu_sve_state_size(vcpu) ({ \
size_t __size_ret; \
unsigned int __vcpu_vq; \

3
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@ -318,7 +318,8 @@ static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
__sve_restore_state(vcpu_sve_pffr(vcpu),
&vcpu->arch.ctxt.fp_regs.fpsr,
true);
write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
write_sysreg_el1(__vcpu_sys_reg(vcpu, vcpu_sve_zcr_elx(vcpu)), SYS_ZCR);
}
static inline void __hyp_sve_save_host(void)