[v8] arm64: Support for Arm CCA in KVM

[PATCH v8 42/43] KVM: arm64: Expose KVM_ARM_VCPU_REC to user space

Posted by Steven Price 8 months ago

Increment KVM_VCPU_MAX_FEATURES to expose the new capability to user
space.

Signed-off-by: Steven Price <steven.price@arm.com>
---
*NOTE*: This also exposes KVM_ARM_VCPU_HAS_EL2/KVM_ARM_VCPU_HAS_EL2_E2H0
(as they are both less than KVM_ARM_VCPU_REC) - so this currently
depends on nested virt being 'finished' before merging.

So this should be merged after: "KVM: arm64: Allow userspace to request
KVM_ARM_VCPU_EL2*":
https://lore.kernel.org/r/20250408105225.4002637-17-maz%40kernel.org
---
 arch/arm64/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 3c61b84e5c4e..6d0b1772540d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -40,7 +40,7 @@
 
 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
 
-#define KVM_VCPU_MAX_FEATURES 7
+#define KVM_VCPU_MAX_FEATURES 10
 #define KVM_VCPU_VALID_FEATURES	(BIT(KVM_VCPU_MAX_FEATURES) - 1)
 
 #define KVM_REQ_SLEEP \
-- 
2.43.0

Re: [PATCH v8 42/43] KVM: arm64: Expose KVM_ARM_VCPU_REC to user space

Posted by Gavin Shan 7 months, 2 weeks ago

On 4/16/25 11:42 PM, Steven Price wrote:
> Increment KVM_VCPU_MAX_FEATURES to expose the new capability to user
> space.
> 
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
> *NOTE*: This also exposes KVM_ARM_VCPU_HAS_EL2/KVM_ARM_VCPU_HAS_EL2_E2H0
> (as they are both less than KVM_ARM_VCPU_REC) - so this currently
> depends on nested virt being 'finished' before merging.
> 
> So this should be merged after: "KVM: arm64: Allow userspace to request
> KVM_ARM_VCPU_EL2*":
> https://lore.kernel.org/r/20250408105225.4002637-17-maz%40kernel.org
> ---
>   arch/arm64/include/asm/kvm_host.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Gavin Shan <gshan@redhat.com>