Re: [PATCH v4 17/34] KVM: arm64: Elevate hypervisor mappings creation at EL2
flat view
From: Will Deacon <will@kernel.org>
Date: 2021-03-11 17:29:35
Also in:
kvmarm, lkml
On Wed, Mar 10, 2021 at 05:57:34PM +0000, Quentin Perret wrote:
Previous commits have introduced infrastructure to enable the EL2 code to manage its own stage 1 mappings. However, this was preliminary work, and none of it is currently in use. Put all of this together by elevating the mapping creation at EL2 when memory protection is enabled. In this case, the host kernel running at EL1 still creates _temporary_ EL2 mappings, only used while initializing the hypervisor, but frees them right after. As such, all calls to create_hyp_mappings() after kvm init has finished turn into hypercalls, as the host now has no 'legal' way to modify the hypevisor page tables directly. Signed-off-by: Quentin Perret <redacted> --- arch/arm64/include/asm/kvm_mmu.h | 2 +- arch/arm64/kvm/arm.c | 87 +++++++++++++++++++++++++++++--- arch/arm64/kvm/mmu.c | 43 ++++++++++++++-- 3 files changed, 120 insertions(+), 12 deletions(-)
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