On 18/03/2024 07:17, Ganapatrao Kulkarni wrote:
>
>
> On 27-01-2023 04:59 pm, 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>
>> ---
>> arch/arm64/include/asm/kvm_emulate.h | 17 ++++++++++
>> arch/arm64/include/asm/kvm_host.h | 4 +++
>> arch/arm64/include/asm/kvm_rme.h | 22 +++++++++++++
>> arch/arm64/include/asm/virt.h | 1 +
>> arch/arm64/kvm/Makefile | 3 +-
>> arch/arm64/kvm/arm.c | 8 +++++
>> arch/arm64/kvm/rme.c | 49 ++++++++++++++++++++++++++++
>> 7 files changed, 103 insertions(+), 1 deletion(-)
>> create mode 100644 arch/arm64/include/asm/kvm_rme.h
>> create mode 100644 arch/arm64/kvm/rme.c
>>
[...]
>> diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c
>> new file mode 100644
>> index 000000000000..f6b587bc116e
>> --- /dev/null
>> +++ b/arch/arm64/kvm/rme.c
>> @@ -0,0 +1,49 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2023 ARM Ltd.
>> + */
>> +
>> +#include <linux/kvm_host.h>
>> +
>> +#include <asm/rmi_cmds.h>
>> +#include <asm/virt.h>
>> +
>> +static int rmi_check_version(void)
>> +{
>> + struct arm_smccc_res res;
>> + int version_major, version_minor;
>> +
>> + arm_smccc_1_1_invoke(SMC_RMI_VERSION, &res);
>> +
>> + if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
>> + return -ENXIO;
>> +
>> + version_major = RMI_ABI_VERSION_GET_MAJOR(res.a0);
>> + version_minor = RMI_ABI_VERSION_GET_MINOR(res.a0);
>> +
>> + if (version_major != RMI_ABI_MAJOR_VERSION) {
>> + kvm_err("Unsupported RMI ABI (version %d.%d) we support %d\n",
>
> Can we please replace "we support" to host supports.
> Also in the patch present in the repo, you are using variable
> our_version, can this be changed to host_version?
Sure, I do have a bad habit using "we" - thanks for point it out.
Steve
>> + version_major, version_minor,
>> + RMI_ABI_MAJOR_VERSION);
>> + return -ENXIO;
>> + }
>> +
>> + kvm_info("RMI ABI version %d.%d\n", version_major, version_minor);
>> +
>> + return 0;
>> +}
>> +
>> +int kvm_init_rme(void)
>> +{
>> + if (PAGE_SIZE != SZ_4K)
>> + /* Only 4k page size on the host is supported */
>> + return 0;
>> +
>> + if (rmi_check_version())
>> + /* Continue without realm support */
>> + return 0;
>> +
>> + /* Future patch will enable static branch kvm_rme_is_available */
>> +
>> + return 0;
>> +}
>
> Thanks,
> Ganapat
