On 12/13/24 1:55 AM, Steven Price wrote:
Query the RMI version number and check if it is a compatible version. A
static key is also provided to signal that a supported RMM is available.
Functions are provided to query if a VM or VCPU is a realm (or rec)
which currently will always return false.
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
Changes since v5:
* Reword "unsupported" message from "host supports" to "we want" to
clarify that 'we' are the 'host'.
Changes since v2:
* Drop return value from kvm_init_rme(), it was always 0.
* Rely on the RMM return value to identify whether the RSI ABI is
compatible.
---
arch/arm64/include/asm/kvm_emulate.h | 18 +++++++++
arch/arm64/include/asm/kvm_host.h | 4 ++
arch/arm64/include/asm/kvm_rme.h | 56 ++++++++++++++++++++++++++++
arch/arm64/include/asm/virt.h | 1 +
arch/arm64/kvm/Makefile | 3 +-
arch/arm64/kvm/arm.c | 6 +++
arch/arm64/kvm/rme.c | 50 +++++++++++++++++++++++++
7 files changed, 137 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/include/asm/kvm_rme.h
create mode 100644 arch/arm64/kvm/rme.c
[...]
+
+static inline bool kvm_is_realm(struct kvm *kvm)
+{
+ if (static_branch_unlikely(&kvm_rme_is_available) && kvm)
+ return kvm->arch.is_realm;
+ return false;
+}
+
kvm->arch.is_realm won't be true when kvm_rme_is_available is false. It's set
in kvm_arch_init_vm() of PATCH[10]. So it's safe to be simplified as below if
the changes to kvm_arch_init_vm() is slightly modified, more details can be
found from the comments to PATCH[10]
With the changes, we don't have to check kvm_rme_is_available every time.
static inline bool kvm_is_realm(struct kvm *kvm)
{
return (kvm && kvm->arch.is_realm);
}
Thanks,
Gavin
