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| author | Quentin Perret <qperret@google.com> | 2021-08-09 18:24:47 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-08-11 13:39:52 +0300 |
| commit | 66c57edd3bc79e3527daaae8123f72ecd1e3fa25 (patch) | |
| tree | 1643a55ee0aeee2d0a2de38ced7792db0d2a66c1 /arch/arm64/include/asm/kvm_asm.h | |
| parent | f9370010e92638f66473baf342e19de940403362 (diff) | |
| download | linux-66c57edd3bc79e3527daaae8123f72ecd1e3fa25.tar.xz | |
KVM: arm64: Restrict EL2 stage-1 changes in protected mode
The host kernel is currently able to change EL2 stage-1 mappings without
restrictions thanks to the __pkvm_create_mappings() hypercall. But in a
world where the host is no longer part of the TCB, this clearly poses a
problem.
To fix this, introduce a new hypercall to allow the host to share a
physical memory page with the hypervisor, and remove the
__pkvm_create_mappings() variant. The new hypercall implements
ownership and permission checks before allowing the sharing operation,
and it annotates the shared page in the hypervisor stage-1 and host
stage-2 page-tables.
Signed-off-by: Quentin Perret <qperret@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210809152448.1810400-21-qperret@google.com
Diffstat (limited to 'arch/arm64/include/asm/kvm_asm.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_asm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 432a9ea1f02e..aed2aa61766a 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -59,7 +59,7 @@ #define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs 13 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs 14 #define __KVM_HOST_SMCCC_FUNC___pkvm_init 15 -#define __KVM_HOST_SMCCC_FUNC___pkvm_create_mappings 16 +#define __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp 16 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping 17 #define __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector 18 #define __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize 19 |