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| author | Oliver Upton <oliver.upton@linux.dev> | 2023-04-04 15:40:44 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-04-05 12:07:41 +0100 |
| commit | fb88707dd39bd1d5ec4a058776de9ee99bcc7b72 (patch) | |
| tree | 69568a3ffa09c4257bbf3b1195573b84a52510f4 /arch/arm64/include | |
| parent | a8308b3fc9494953c453480fb277e24f82f7d2b9 (diff) | |
| download | linux-stable-fb88707dd39bd1d5ec4a058776de9ee99bcc7b72.tar.gz linux-stable-fb88707dd39bd1d5ec4a058776de9ee99bcc7b72.tar.bz2 linux-stable-fb88707dd39bd1d5ec4a058776de9ee99bcc7b72.zip | |
KVM: arm64: Use a maple tree to represent the SMCCC filter
Maple tree is an efficient B-tree implementation that is intended for
storing non-overlapping intervals. Such a data structure is a good fit
for the SMCCC filter as it is desirable to sparsely allocate the 32 bit
function ID space.
To that end, add a maple tree to kvm_arch and correctly init/teardown
along with the VM. Wire in a test against the hypercall filter for HVCs
which does nothing until the controls are exposed to userspace.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230404154050.2270077-8-oliver.upton@linux.dev
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index d091d1c9890b..2682b3fd0881 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -16,6 +16,7 @@ #include <linux/types.h> #include <linux/jump_label.h> #include <linux/kvm_types.h> +#include <linux/maple_tree.h> #include <linux/percpu.h> #include <linux/psci.h> #include <asm/arch_gicv3.h> @@ -221,7 +222,8 @@ struct kvm_arch { #define KVM_ARCH_FLAG_EL1_32BIT 4 /* PSCI SYSTEM_SUSPEND enabled for the guest */ #define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED 5 - + /* SMCCC filter initialized for the VM */ +#define KVM_ARCH_FLAG_SMCCC_FILTER_CONFIGURED 6 unsigned long flags; /* @@ -242,6 +244,7 @@ struct kvm_arch { /* Hypercall features firmware registers' descriptor */ struct kvm_smccc_features smccc_feat; + struct maple_tree smccc_filter; /* * For an untrusted host VM, 'pkvm.handle' is used to lookup |