Re: [RFC v2 01/24] linux-headers: Add RME related definitions

[Gavin Shan]

On 7/30/26 3:41 PM, Kohei Enju wrote:

On 07/28 13:26, Mathieu Poirier wrote:

From: Jean-Philippe Brucker <jean-phili...@linaro.org>

This is a temporary patch intended for testing purposes only. It provides
definitions related to supporting Realms by the QEMU-VMM.

Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
  linux-headers/asm-arm64/kvm.h |  9 +++++++++
  linux-headers/linux/kvm.h     | 10 +++++++++-
  2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/linux-headers/asm-arm64/kvm.h b/linux-headers/asm-arm64/kvm.h
index 6aefe7973814..4c08631ec7d2 100644
--- a/linux-headers/asm-arm64/kvm.h
+++ b/linux-headers/asm-arm64/kvm.h
@@ -208,6 +208,15 @@ struct kvm_arm_counter_offset {
        __u64 reserved;
  };

+#define KVM_ARM_RMI_POPULATE_FLAGS_MEASURE (1 << 0)

+struct kvm_arm_rmi_populate {
+       __u64 base;
+       __u64 size;
+       __u64 source_uaddr;
+       __u32 flags;
+       __u32 reserved;
+};
+
  #define KVM_ARM_TAGS_TO_GUEST         0
  #define KVM_ARM_TAGS_FROM_GUEST               1

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h

index dd52e2a65bfd..cdd5ad11f85a 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -689,14 +689,19 @@ struct kvm_enable_cap {
   * address size for the VM. Bits[7-0] are reserved for the guest
   * PA size shift (i.e, log2(PA_Size)). For backward compatibility,
   * value 0 implies the default IPA size, 40bits.
+ *
+ * Bits[30-31] are reserved for the VM type
   */
  #define KVM_VM_TYPE_ARM_IPA_SIZE_MASK 0xffULL
  #define KVM_VM_TYPE_ARM_IPA_SIZE(x)           \
        ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK)

+#define KVM_VM_TYPE_ARM_NORMAL 0

+#define KVM_VM_TYPE_ARM_REALM          (1UL << 30)
  #define KVM_VM_TYPE_ARM_PROTECTED     (1UL << 31)
  #define KVM_VM_TYPE_ARM_MASK          (KVM_VM_TYPE_ARM_IPA_SIZE_MASK | \
-                                        KVM_VM_TYPE_ARM_PROTECTED)
+                                        KVM_VM_TYPE_ARM_PROTECTED | \
+                                        KVM_VM_TYPE_ARM_REALM)

/*

   * ioctls for /dev/kvm fds:
@@ -719,6 +724,8 @@ struct kvm_enable_cap {
  #define KVM_GET_EMULATED_CPUID          _IOWR(KVMIO, 0x09, struct kvm_cpuid2)
  #define KVM_GET_MSR_FEATURE_INDEX_LIST    _IOWR(KVMIO, 0x0a, struct 
kvm_msr_list)

+#define KVM_ARM_RMI_POPULATE _IOWR(KVMIO, 0xd7, struct kvm_arm_rmi_populate)

+
  /*
   * Extension capability list.
   */
@@ -986,6 +993,7 @@ struct kvm_enable_cap {
  #define KVM_CAP_S390_KEYOP 247
  #define KVM_CAP_S390_VSIE_ESAMODE 248
  #define KVM_CAP_S390_HPAGE_2G 249
+#define KVM_CAP_ARM_RMI 250

Not a big deal, but a note for anyone testing this series:

Use Linaro's Linux kernel tree, as mentioned in the cover letter:
https://gitlab.com/Linaro/cca-public/linux/-/tree/upstream-v2?ref_type=heads

It seems the capability values get an extra leap on KVM_CAP_ARM_AMI in
"upstream-v2" host kernel.

  include/uapi/linux/kvm.h

  #define KVM_CAP_S390_KEYOP 247
  #define KVM_CAP_S390_VSIE_ESAMODE 248
  #define KVM_CAP_ARM_RMI 250

Alternetively, if you're using Arm's tree or other trees with Steven
Price's v14 series as I am:

You'll need to adjust the definition of KVM_CAP_ARM_RMI, since it uses a
differenct capability number.

struct kvm_irq_routing_irqchip {

        __u32 irqchip;
--
2.43.0

Thanks,
Gavin