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KVM: arm64: nv: Save guest's ZCR_EL2 when in hyp context

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When running a guest hypervisor, ZCR_EL2 is an alias for the counterpart
EL1 state.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-6-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-06-20 16:46:42 +00:00
parent 069da3ffda
commit b7e5c94264
1 changed files with 7 additions and 1 deletions
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8
arch/arm64/kvm/fpsimd.c
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@ -178,7 +178,13 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
if (guest_owns_fp_regs()) {
if (vcpu_has_sve(vcpu)) {
__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
u64 zcr = read_sysreg_el1(SYS_ZCR);
/*
* If the vCPU is in the hyp context then ZCR_EL1 is
* loaded with its vEL2 counterpart.
*/
__vcpu_sys_reg(vcpu, vcpu_sve_zcr_elx(vcpu)) = zcr;
/*
* Restore the VL that was saved when bound to the CPU,