Re: [PATCH v3 10/32] KVM: arm64: Introduce an early Hyp page allocator
From: Will Deacon <will@kernel.org>
Date: 2021-03-04 14:39:48
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On Tue, Mar 02, 2021 at 02:59:40PM +0000, Quentin Perret wrote:
With nVHE, the host currently creates all stage 1 hypervisor mappings at EL1 during boot, installs them at EL2, and extends them as required (e.g. when creating a new VM). But in a world where the host is no longer trusted, it cannot have full control over the code mapped in the hypervisor. In preparation for enabling the hypervisor to create its own stage 1 mappings during boot, introduce an early page allocator, with minimal functionality. This allocator is designed to be used only during early bootstrap of the hyp code when memory protection is enabled, which will then switch to using a full-fledged page allocator after init. Signed-off-by: Quentin Perret <redacted> --- arch/arm64/kvm/hyp/include/nvhe/early_alloc.h | 14 +++++ arch/arm64/kvm/hyp/include/nvhe/memory.h | 24 +++++++++ arch/arm64/kvm/hyp/nvhe/Makefile | 2 +- arch/arm64/kvm/hyp/nvhe/early_alloc.c | 54 +++++++++++++++++++ arch/arm64/kvm/hyp/nvhe/psci-relay.c | 4 +- 5 files changed, 94 insertions(+), 4 deletions(-) create mode 100644 arch/arm64/kvm/hyp/include/nvhe/early_alloc.h create mode 100644 arch/arm64/kvm/hyp/include/nvhe/memory.h create mode 100644 arch/arm64/kvm/hyp/nvhe/early_alloc.c
Acked-by: Will Deacon <will@kernel.org> Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel