linux/arch/powerpc/kvm/book3s_hv.h
Nicholas Piggin 5236756d04 KVM: PPC: Book3S HV P9: Use Linux SPR save/restore to manage some host SPRs
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
2021-11-24 21:09:01 +11:00

43 lines
1.1 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Privileged (non-hypervisor) host registers to save.
*/
struct p9_host_os_sprs {
unsigned long iamr;
unsigned long amr;
unsigned int pmc1;
unsigned int pmc2;
unsigned int pmc3;
unsigned int pmc4;
unsigned int pmc5;
unsigned int pmc6;
unsigned long mmcr0;
unsigned long mmcr1;
unsigned long mmcr2;
unsigned long mmcr3;
unsigned long mmcra;
unsigned long siar;
unsigned long sier1;
unsigned long sier2;
unsigned long sier3;
unsigned long sdar;
};
static inline bool nesting_enabled(struct kvm *kvm)
{
return kvm->arch.nested_enable && kvm_is_radix(kvm);
}
bool load_vcpu_state(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs);
void store_vcpu_state(struct kvm_vcpu *vcpu);
void save_p9_host_os_sprs(struct p9_host_os_sprs *host_os_sprs);
void restore_p9_host_os_sprs(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs);
void switch_pmu_to_guest(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs);
void switch_pmu_to_host(struct kvm_vcpu *vcpu,
struct p9_host_os_sprs *host_os_sprs);