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KVM: PPC: Book3S HV nestedv2: Avoid reloading the tb offset

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The kvmppc_get_tb_offset() getter reloads KVMPPC_GSID_TB_OFFSET from the
L0 for nestedv2 host. This is unnecessary as the value does not change.
KVMPPC_GSID_TB_OFFSET also need not be reloaded in
kvmppc_{s,g}et_dec_expires().

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231201132618.555031-3-vaibhav@linux.ibm.com
This commit is contained in:
Jordan Niethe 2023-12-01 18:56:07 +05:30 committed by Michael Ellerman
parent 7d370e1812
commit e0d4acbcba
1 changed files with 6 additions and 3 deletions
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9
arch/powerpc/include/asm/kvm_book3s.h
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@ -594,13 +594,17 @@ static inline u##size kvmppc_get_##reg(struct kvm_vcpu *vcpu) \
KVMPPC_BOOK3S_VCORE_ACCESSOR(vtb, 64, KVMPPC_GSID_VTB)
KVMPPC_BOOK3S_VCORE_ACCESSOR(tb_offset, 64, KVMPPC_GSID_TB_OFFSET)
KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(arch_compat, 32, KVMPPC_GSID_LOGICAL_PVR)
KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(lpcr, 64, KVMPPC_GSID_LPCR)
KVMPPC_BOOK3S_VCORE_ACCESSOR_SET(tb_offset, 64, KVMPPC_GSID_TB_OFFSET)
static inline u64 kvmppc_get_tb_offset(struct kvm_vcpu *vcpu)
{
return vcpu->arch.vcore->tb_offset;
}
static inline u64 kvmppc_get_dec_expires(struct kvm_vcpu *vcpu)
{
WARN_ON(kvmhv_nestedv2_cached_reload(vcpu, KVMPPC_GSID_TB_OFFSET) < 0);
WARN_ON(kvmhv_nestedv2_cached_reload(vcpu, KVMPPC_GSID_DEC_EXPIRY_TB) < 0);
return vcpu->arch.dec_expires;
}
@ -608,7 +612,6 @@ static inline u64 kvmppc_get_dec_expires(struct kvm_vcpu *vcpu)
static inline void kvmppc_set_dec_expires(struct kvm_vcpu *vcpu, u64 val)
{
vcpu->arch.dec_expires = val;
WARN_ON(kvmhv_nestedv2_cached_reload(vcpu, KVMPPC_GSID_TB_OFFSET) < 0);
kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_DEC_EXPIRY_TB);
}