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A significant part of what a NV hypervisor needs to do is to decide whether a trap from a L2+ guest has to be forwarded to a L1 guest or handled locally. This is done by checking for the trap bits that the guest hypervisor has set and acting accordingly, as described by the architecture. A previous approach was to sprinkle a bunch of checks in all the system register accessors, but this is pretty error prone and doesn't help getting an overview of what is happening. Instead, implement a set of global tables that describe a trap bit, combinations of trap bits, behaviours on trap, and what bits must be evaluated on a system register trap. Although this is painful to describe, this allows to specify each and every control bit in a static manner. To make it efficient, the table is inserted in an xarray that is global to the system, and checked each time we trap a system register while running a L2 guest. Add the basic infrastructure for now, while additional patches will implement configuration registers. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Jing Zhang <jingzhangos@google.com> Reviewed-by: Miguel Luis <miguel.luis@oracle.com> Link: https://lore.kernel.org/r/20230815183903.2735724-15-maz@kernel.org
23 lines
594 B
C
23 lines
594 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ARM64_KVM_NESTED_H
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#define __ARM64_KVM_NESTED_H
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#include <linux/kvm_host.h>
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static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
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{
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return (!__is_defined(__KVM_NVHE_HYPERVISOR__) &&
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cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
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test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
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}
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extern bool __check_nv_sr_forward(struct kvm_vcpu *vcpu);
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struct sys_reg_params;
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struct sys_reg_desc;
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void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p,
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const struct sys_reg_desc *r);
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#endif /* __ARM64_KVM_NESTED_H */
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