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KVM: arm64: Reset VM feature ID regs from kvm_reset_sys_regs()

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A subsequent change to KVM will expand the range of feature ID registers
that get special treatment at reset. Fold the existing ones back in to
kvm_reset_sys_regs() to avoid the need for an additional table walk.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240502233529.1958459-3-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton
2024-05-02 23:35:24 +00:00
committed by Marc Zyngier
parent 592efc606b
commit 44cbe80b76
1 changed files with 10 additions and 17 deletions
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27
arch/arm64/kvm/sys_regs.c
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@@ -3510,26 +3510,16 @@ void kvm_sys_regs_create_debugfs(struct kvm *kvm)
&idregs_debug_fops);
}
static void kvm_reset_id_regs(struct kvm_vcpu *vcpu)
static void reset_vm_ftr_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *reg)
{
const struct sys_reg_desc *idreg = first_idreg;
u32 id = reg_to_encoding(idreg);
u32 id = reg_to_encoding(reg);
struct kvm *kvm = vcpu->kvm;
if (test_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags))
return;
lockdep_assert_held(&kvm->arch.config_lock);
/* Initialize all idregs */
while (is_vm_ftr_id_reg(id)) {
IDREG(kvm, id) = idreg->reset(vcpu, idreg);
idreg++;
id = reg_to_encoding(idreg);
}
set_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags);
IDREG(kvm, id) = reg->reset(vcpu, reg);
}
/**
@@ -3541,19 +3531,22 @@ static void kvm_reset_id_regs(struct kvm_vcpu *vcpu)
*/
void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
unsigned long i;
kvm_reset_id_regs(vcpu);
for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) {
const struct sys_reg_desc *r = &sys_reg_descs[i];
if (is_vm_ftr_id_reg(reg_to_encoding(r)))
if (!r->reset)
continue;
if (r->reset)
if (is_vm_ftr_id_reg(reg_to_encoding(r)))
reset_vm_ftr_id_reg(vcpu, r);
else
r->reset(vcpu, r);
}
set_bit(KVM_ARCH_FLAG_ID_REGS_INITIALIZED, &kvm->arch.flags);
}
/**