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5236756d04
Linux implements SPR save/restore including storage space for registers in the task struct for process context switching. Make use of this similarly to the way we make use of the context switching fp/vec save restore. This improves code reuse, allows some stack space to be saved, and helps with avoiding VRSAVE updates if they are not required. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211123095231.1036501-39-npiggin@gmail.com
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Privileged (non-hypervisor) host registers to save.
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*/
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struct p9_host_os_sprs {
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unsigned long iamr;
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unsigned long amr;
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unsigned int pmc1;
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unsigned int pmc2;
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unsigned int pmc3;
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unsigned int pmc4;
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unsigned int pmc5;
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unsigned int pmc6;
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unsigned long mmcr0;
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unsigned long mmcr1;
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unsigned long mmcr2;
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unsigned long mmcr3;
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unsigned long mmcra;
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unsigned long siar;
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unsigned long sier1;
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unsigned long sier2;
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unsigned long sier3;
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unsigned long sdar;
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};
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static inline bool nesting_enabled(struct kvm *kvm)
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{
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return kvm->arch.nested_enable && kvm_is_radix(kvm);
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}
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bool load_vcpu_state(struct kvm_vcpu *vcpu,
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struct p9_host_os_sprs *host_os_sprs);
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void store_vcpu_state(struct kvm_vcpu *vcpu);
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void save_p9_host_os_sprs(struct p9_host_os_sprs *host_os_sprs);
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void restore_p9_host_os_sprs(struct kvm_vcpu *vcpu,
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struct p9_host_os_sprs *host_os_sprs);
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void switch_pmu_to_guest(struct kvm_vcpu *vcpu,
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struct p9_host_os_sprs *host_os_sprs);
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void switch_pmu_to_host(struct kvm_vcpu *vcpu,
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struct p9_host_os_sprs *host_os_sprs);
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