Re: [PATCH v4 05/43] arm64: RME: Add SMC definitions for calling the RMM

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Hi Steven,

On 8/22/24 1:38 AM, Steven Price wrote:
The RMM (Realm Management Monitor) provides functionality that can be
accessed by SMC calls from the host.

The SMC definitions are based on DEN0137[1] version 1.0-rel0-rc1

[1] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf

Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
Changes since v3:
  * Update to match RMM spec v1.0-rel0-rc1.
Changes since v2:
  * Fix specification link.
  * Rename rec_entry->rec_enter to match spec.
  * Fix size of pmu_ovf_status to match spec.
---
  arch/arm64/include/asm/rmi_smc.h | 253 +++++++++++++++++++++++++++++++
  1 file changed, 253 insertions(+)
  create mode 100644 arch/arm64/include/asm/rmi_smc.h


[...]

+
+#define RMI_FEATURE_REGISTER_0_S2SZ		GENMASK(7, 0)
+#define RMI_FEATURE_REGISTER_0_LPA2		BIT(8)
+#define RMI_FEATURE_REGISTER_0_SVE_EN		BIT(9)
+#define RMI_FEATURE_REGISTER_0_SVE_VL		GENMASK(13, 10)
+#define RMI_FEATURE_REGISTER_0_NUM_BPS		GENMASK(19, 14)
+#define RMI_FEATURE_REGISTER_0_NUM_WPS		GENMASK(25, 20)
+#define RMI_FEATURE_REGISTER_0_PMU_EN		BIT(26)
+#define RMI_FEATURE_REGISTER_0_PMU_NUM_CTRS	GENMASK(31, 27)
+#define RMI_FEATURE_REGISTER_0_HASH_SHA_256	BIT(32)
+#define RMI_FEATURE_REGISTER_0_HASH_SHA_512	BIT(33)
+#define RMI_FEATURE_REGISTER_0_GICV3_NUM_LRS	GENMASK(37, 34)
+#define RMI_FEATURE_REGISTER_0_MAX_RECS_ORDER	GENMASK(41, 38)
+

Those definitions aren't consistent to tf-rmm at least. For example, the latest tf-rmm
has bit-28 and bit-29 for RMI_FEATURE_REGISTER_0_HASH_SHA_{256, 512}. I didn't check the
specification yet, but they need to be corrected in Linux host or tf-rmm.

  git@xxxxxxxxxx:TF-RMM/tf-rmm.git
  head: 258b7952640b Merge "fix(tools/clang-tidy): ignore header include check" into integration

  [gshan@gshan tf-rmm]$ git grep RMI_FEATURE_REGISTER_0_HASH_SHA.*_SHIFT
  lib/smc/include/smc-rmi.h:#define RMI_FEATURE_REGISTER_0_HASH_SHA_256_SHIFT     UL(28)
  lib/smc/include/smc-rmi.h:#define RMI_FEATURE_REGISTER_0_HASH_SHA_512_SHIFT     UL(29)

Due to the inconsistent definitions, I'm unable to start a guest with the following
combination: linux-host/cca-host/v4, linux-guest/cca-guest/v5, kvmtool/cca/v2.

  # ./start_guest.sh
  Info: # lkvm run -k Image -m 256 -c 2 --name guest-152
  [  145.894085] config_realm_hash_algo: unsupported ALGO_SHA256 by rmm_feat_reg0=0x0000000034488e30
  KVM_CAP_RME(KVM_CAP_ARM_RME_CONFIG_REALM) hash_algo: Invalid argument

Thanks,
Gavin





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