KVM: PPC: Book3S HV: Introduce low level MSR accessor

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[ Upstream commit 6de2e837ba ]

kvmppc_get_msr() and kvmppc_set_msr_fast() serve as accessors for the
MSR. However because the MSR is kept in the shared regs they include a
conditional check for kvmppc_shared_big_endian() and endian conversion.

Within the Book3S HV specific code there are direct reads and writes of
shregs::msr. In preparation for Nested APIv2 these accesses need to be
replaced with accessor functions so it is possible to extend their
behavior. However, using the kvmppc_get_msr() and kvmppc_set_msr_fast()
functions is undesirable because it would introduce a conditional branch
and endian conversion that is not currently present.

kvmppc_set_msr_hv() already exists, it is used for the
kvmppc_ops::set_msr callback.

Introduce a low level accessor __kvmppc_{s,g}et_msr_hv() that simply
gets and sets shregs::msr. This will be extend for Nested APIv2 support.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230914030600.16993-8-jniethe5@gmail.com
Stable-dep-of: ecd10702ba ("KVM: PPC: Book3S HV: Handle pending exceptions on guest entry with MSR_EE")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Jordan Niethe 2023-09-14 13:05:56 +10:00 • committed by Greg Kroah-Hartman

parent abcaadd4ce

commit 267980ea10

4 changed files with 33 additions and 21 deletions

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5

arch/powerpc/kvm/book3s_64_mmu_hv.c

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arch/powerpc/kvm/book3s_hv.c

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arch/powerpc/kvm/book3s_hv.h

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arch/powerpc/kvm/book3s_hv_builtin.c

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