wireguard-linux/arch/arm64/include/asm/kvm_pgtable.h, branch jd/orphan-parallel

KVM: arm64: Add support for relaxing stage-2 perms in generic page-table code

2020-09-11T14:51:15Z

Add support for relaxing the permissions of a stage-2 mapping (i.e. adding additional permissions) to the generic page-table code. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-17-will@kernel.org

KVM: arm64: Add support for stage-2 cache flushing in generic page-table

2020-09-11T14:51:14Z

Add support for cache flushing a range of the stage-2 address space to the generic page-table code. Signed-off-by: Quentin Perret Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Link: https://lore.kernel.org/r/20200911132529.19844-15-will@kernel.org

KVM: arm64: Add support for stage-2 write-protect in generic page-table

2020-09-11T14:51:14Z

Add a stage-2 wrprotect() operation to the generic page-table code. Signed-off-by: Quentin Perret Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Link: https://lore.kernel.org/r/20200911132529.19844-13-will@kernel.org

KVM: arm64: Add support for stage-2 page-aging in generic page-table

2020-09-11T14:51:14Z

Add stage-2 mkyoung(), mkold() and is_young() operations to the generic page-table code. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-11-will@kernel.org

KVM: arm64: Add support for stage-2 map()/unmap() in generic page-table

2020-09-11T14:51:13Z

Add stage-2 map() and unmap() operations to the generic page-table code. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-7-will@kernel.org

KVM: arm64: Add support for creating kernel-agnostic stage-2 page tables

2020-09-11T14:51:13Z

Introduce alloc() and free() functions to the generic page-table code for guest stage-2 page-tables and plumb these into the existing KVM page-table allocator. Subsequent patches will convert other operations within the KVM allocator over to the generic code. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-6-will@kernel.org

KVM: arm64: Use generic allocator for hyp stage-1 page-tables

2020-09-11T14:51:13Z

Now that we have a shiny new page-table allocator, replace the hyp page-table code with calls into the new API. This also allows us to remove the extended idmap code, as we can now simply ensure that the VA size is large enough to map everything we need. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-5-will@kernel.org

KVM: arm64: Add support for creating kernel-agnostic stage-1 page tables

2020-09-11T14:51:12Z

The generic page-table walker is pretty useless as it stands, because it doesn't understand enough to allocate anything. Teach it about stage-1 page-tables, and hook up an API for allocating these for the hypervisor at EL2. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-4-will@kernel.org

KVM: arm64: Add stand-alone page-table walker infrastructure

2020-09-11T14:51:12Z

The KVM page-table code is intricately tied into the kernel page-table code and re-uses the pte/pmd/pud/p4d/pgd macros directly in an attempt to reduce code duplication. Unfortunately, the reality is that there is an awful lot of code required to make this work, and at the end of the day you're limited to creating page-tables with the same configuration as the host kernel. Furthermore, lifting the page-table code to run directly at EL2 on a non-VHE system (as we plan to to do in future patches) is practically impossible due to the number of dependencies it has on the core kernel. Introduce a framework for walking Armv8 page-tables configured independently from the host kernel. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Cc: Marc Zyngier Cc: Quentin Perret Link: https://lore.kernel.org/r/20200911132529.19844-3-will@kernel.org