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Message-ID: <CAMvTesAag+thUArW-EGL9dxOtGa6CX-8ALUjk9b17M5QBartPA@mail.gmail.com>
Date: Mon, 29 Sep 2025 13:31:04 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
prapal@...ux.microsoft.com, easwar.hariharan@...ux.microsoft.com,
tiala@...rosoft.com, anirudh@...rudhrb.com, paekkaladevi@...ux.microsoft.com,
skinsburskii@...ux.microsoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
wei.liu@...nel.org, decui@...rosoft.com
Subject: Re: [PATCH v4 2/5] mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX hypercall
On Sat, Sep 27, 2025 at 12:23 AM Nuno Das Neves
<nunodasneves@...ux.microsoft.com> wrote:
>
> From: Purna Pavan Chandra Aekkaladevi <paekkaladevi@...ux.microsoft.com>
>
> This hypercall can be used to fetch extended properties of a
> partition. Extended properties are properties with values larger than
> a u64. Some of these also need additional input arguments.
>
> Add helper function for using the hypercall in the mshv_root driver.
>
> Signed-off-by: Purna Pavan Chandra Aekkaladevi <paekkaladevi@...ux.microsoft.com>
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> Reviewed-by: Anirudh Rayabharam <anirudh@...rudhrb.com>
> Reviewed-by: Praveen K Paladugu <prapal@...ux.microsoft.com>
> Reviewed-by: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>
> ---
Reviewed-by: Tianyu Lan <tiala@...rosoft.com>
> drivers/hv/mshv_root.h | 2 ++
> drivers/hv/mshv_root_hv_call.c | 31 ++++++++++++++++++++++++++
> include/hyperv/hvgdk_mini.h | 1 +
> include/hyperv/hvhdk.h | 40 ++++++++++++++++++++++++++++++++++
> include/hyperv/hvhdk_mini.h | 26 ++++++++++++++++++++++
> 5 files changed, 100 insertions(+)
>
> diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h
> index e3931b0f1269..4aeb03bea6b6 100644
> --- a/drivers/hv/mshv_root.h
> +++ b/drivers/hv/mshv_root.h
> @@ -303,6 +303,8 @@ int hv_call_unmap_stat_page(enum hv_stats_object_type type,
> int hv_call_modify_spa_host_access(u64 partition_id, struct page **pages,
> u64 page_struct_count, u32 host_access,
> u32 flags, u8 acquire);
> +int hv_call_get_partition_property_ex(u64 partition_id, u64 property_code, u64 arg,
> + void *property_value, size_t property_value_sz);
>
> extern struct mshv_root mshv_root;
> extern enum hv_scheduler_type hv_scheduler_type;
> diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c
> index c9c274f29c3c..3fd3cce23f69 100644
> --- a/drivers/hv/mshv_root_hv_call.c
> +++ b/drivers/hv/mshv_root_hv_call.c
> @@ -590,6 +590,37 @@ int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
> return hv_result_to_errno(status);
> }
>
> +int hv_call_get_partition_property_ex(u64 partition_id, u64 property_code,
> + u64 arg, void *property_value,
> + size_t property_value_sz)
> +{
> + u64 status;
> + unsigned long flags;
> + struct hv_input_get_partition_property_ex *input;
> + struct hv_output_get_partition_property_ex *output;
> +
> + local_irq_save(flags);
> + input = *this_cpu_ptr(hyperv_pcpu_input_arg);
> + output = *this_cpu_ptr(hyperv_pcpu_output_arg);
> +
> + memset(input, 0, sizeof(*input));
> + input->partition_id = partition_id;
> + input->property_code = property_code;
> + input->arg = arg;
> + status = hv_do_hypercall(HVCALL_GET_PARTITION_PROPERTY_EX, input, output);
> +
> + if (!hv_result_success(status)) {
> + hv_status_debug(status, "\n");
> + local_irq_restore(flags);
> + return hv_result_to_errno(status);
> + }
> + memcpy(property_value, &output->property_value, property_value_sz);
> +
> + local_irq_restore(flags);
> +
> + return 0;
> +}
> +
> int
> hv_call_clear_virtual_interrupt(u64 partition_id)
> {
> diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
> index 1be7f6a02304..ff4325fb623a 100644
> --- a/include/hyperv/hvgdk_mini.h
> +++ b/include/hyperv/hvgdk_mini.h
> @@ -490,6 +490,7 @@ union hv_vp_assist_msr_contents { /* HV_REGISTER_VP_ASSIST_PAGE */
> #define HVCALL_GET_VP_STATE 0x00e3
> #define HVCALL_SET_VP_STATE 0x00e4
> #define HVCALL_GET_VP_CPUID_VALUES 0x00f4
> +#define HVCALL_GET_PARTITION_PROPERTY_EX 0x0101
> #define HVCALL_MMIO_READ 0x0106
> #define HVCALL_MMIO_WRITE 0x0107
>
> diff --git a/include/hyperv/hvhdk.h b/include/hyperv/hvhdk.h
> index b4067ada02cf..416c0d45b793 100644
> --- a/include/hyperv/hvhdk.h
> +++ b/include/hyperv/hvhdk.h
> @@ -376,6 +376,46 @@ struct hv_input_set_partition_property {
> u64 property_value;
> } __packed;
>
> +union hv_partition_property_arg {
> + u64 as_uint64;
> + struct {
> + union {
> + u32 arg;
> + u32 vp_index;
> + };
> + u16 reserved0;
> + u8 reserved1;
> + u8 object_type;
> + } __packed;
> +};
> +
> +struct hv_input_get_partition_property_ex {
> + u64 partition_id;
> + u32 property_code; /* enum hv_partition_property_code */
> + u32 padding;
> + union {
> + union hv_partition_property_arg arg_data;
> + u64 arg;
> + };
> +} __packed;
> +
> +/*
> + * NOTE: Should use hv_input_set_partition_property_ex_header to compute this
> + * size, but hv_input_get_partition_property_ex is identical so it suffices
> + */
> +#define HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE \
> + (HV_HYP_PAGE_SIZE - sizeof(struct hv_input_get_partition_property_ex))
> +
> +union hv_partition_property_ex {
> + u8 buffer[HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE];
> + struct hv_partition_property_vmm_capabilities vmm_capabilities;
> + /* More fields to be filled in when needed */
> +};
> +
> +struct hv_output_get_partition_property_ex {
> + union hv_partition_property_ex property_value;
> +} __packed;
> +
> enum hv_vp_state_page_type {
> HV_VP_STATE_PAGE_REGISTERS = 0,
> HV_VP_STATE_PAGE_INTERCEPT_MESSAGE = 1,
> diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
> index 858f6a3925b3..bf2ce27dfcc5 100644
> --- a/include/hyperv/hvhdk_mini.h
> +++ b/include/hyperv/hvhdk_mini.h
> @@ -96,8 +96,34 @@ enum hv_partition_property_code {
> HV_PARTITION_PROPERTY_XSAVE_STATES = 0x00060007,
> HV_PARTITION_PROPERTY_MAX_XSAVE_DATA_SIZE = 0x00060008,
> HV_PARTITION_PROPERTY_PROCESSOR_CLOCK_FREQUENCY = 0x00060009,
> +
> + /* Extended properties with larger property values */
> + HV_PARTITION_PROPERTY_VMM_CAPABILITIES = 0x00090007,
> };
>
> +#define HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT 1
> +#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT 59
> +
> +struct hv_partition_property_vmm_capabilities {
> + u16 bank_count;
> + u16 reserved[3];
> + union {
> + u64 as_uint64[HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT];
> + struct {
> + u64 map_gpa_preserve_adjustable: 1;
> + u64 vmm_can_provide_overlay_gpfn: 1;
> + u64 vp_affinity_property: 1;
> +#if IS_ENABLED(CONFIG_ARM64)
> + u64 vmm_can_provide_gic_overlay_locations: 1;
> +#else
> + u64 reservedbit3: 1;
> +#endif
> + u64 assignable_synthetic_proc_features: 1;
> + u64 reserved0: HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT;
> + } __packed;
> + };
> +} __packed;
> +
> enum hv_snp_status {
> HV_SNP_STATUS_NONE = 0,
> HV_SNP_STATUS_AVAILABLE = 1,
> --
> 2.34.1
>
>
--
Thanks
Tianyu Lan
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