Commit 59aeea19 authored by Purna Pavan Chandra Aekkaladevi's avatar Purna Pavan Chandra Aekkaladevi Committed by Wei Liu
Browse files

mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX hypercall 



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: default avatarPurna Pavan Chandra Aekkaladevi <paekkaladevi@linux.microsoft.com>
Signed-off-by: default avatarNuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: default avatarAnirudh Rayabharam <anirudh@anirudhrb.com>
Reviewed-by: default avatarPraveen K Paladugu <prapal@linux.microsoft.com>
Reviewed-by: default avatarEaswar Hariharan <easwar.hariharan@linux.microsoft.com>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 9ebc528c

drivers/hv/mshv_root.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

drivers/hv/mshv_root_hv_call.c

+31 −0
Original line number Diff line number Diff line
@@ -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)) {

		local_irq_restore(flags);

		hv_status_debug(status, "\n");

		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)

{

include/hyperv/hvgdk_mini.h

+1 −0
Original line number Diff line number Diff line
@@ -491,6 +491,7 @@ 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

include/hyperv/hvhdk.h

+40 −0
Original line number Diff line number Diff line
@@ -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,

include/hyperv/hvhdk_mini.h

+26 −0
Original line number Diff line number Diff line
@@ -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,