KVM: arm64: Allocate memory mapped at hyp for host sve state in pKVM

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Protected mode needs to maintain (save/restore) the host's sve
state, rather than relying on the host kernel to do that. This is
to avoid leaking information to the host about guests and the
type of operations they are performing.

As a first step towards that, allocate memory mapped at hyp, per
cpu, for the host sve state. The following patch will use this
memory to save/restore the host state.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20240603122852.3923848-6-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Fuad Tabba 2024-06-03 13:28:47 +01:00 • committed by Marc Zyngier

parent e511e08a9f

commit 66d5b53e20

7 changed files with 124 additions and 0 deletions

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17

arch/arm64/include/asm/kvm_host.h

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1

arch/arm64/include/asm/kvm_hyp.h

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9

arch/arm64/include/asm/kvm_pkvm.h

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68

arch/arm64/kvm/arm.c

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2

arch/arm64/kvm/hyp/nvhe/pkvm.c

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24

arch/arm64/kvm/hyp/nvhe/setup.c

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3

arch/arm64/kvm/reset.c

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