From: Wei Liu <[email protected]> Add a helper for HVCALL_ISSUE_SNP_PSP_GUEST_REQUEST so MSHV can issue asynchronous PSP guest requests on behalf of encrypted partitions.
Signed-off-by: Wei Liu <[email protected]> --- drivers/hv/mshv_root.h | 8 +++++++ drivers/hv/mshv_root_hv_call.c | 39 ++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h index 1f086dcb7aa1..8abb080938fd 100644 --- a/drivers/hv/mshv_root.h +++ b/drivers/hv/mshv_root.h @@ -378,4 +378,12 @@ bool mshv_region_handle_gfn_fault(struct mshv_mem_region *region, u64 gfn); void mshv_region_movable_fini(struct mshv_mem_region *region); bool mshv_region_movable_init(struct mshv_mem_region *region); +#ifdef HV_SUPPORTS_SEV_SNP_GUESTS +int hv_call_issue_psp_guest_request(u64 partition_id, u64 req_pfn, + u64 rsp_pfn, + void (*completion_handler)(void *data, + u64 *status), + void *completion_data); +#endif + #endif /* _MSHV_ROOT_H_ */ diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c index cb55d4d4be2e..48abe338c06f 100644 --- a/drivers/hv/mshv_root_hv_call.c +++ b/drivers/hv/mshv_root_hv_call.c @@ -1009,6 +1009,45 @@ int hv_unmap_stats_page(enum hv_stats_object_type type, return ret; } +#ifdef HV_SUPPORTS_SEV_SNP_GUESTS +int hv_call_issue_psp_guest_request(u64 partition_id, u64 req_pfn, + u64 rsp_pfn, + void (*completion_handler)(void *data, + u64 *status), + void *completion_data) +{ + struct hv_input_issue_psp_guest_request *input; + unsigned long flags; + u64 status; + + if (!completion_handler) { + pr_err("%s: missing completion handler\n", __func__); + return -EINVAL; + } + + local_irq_save(flags); + input = *this_cpu_ptr(hyperv_pcpu_input_arg); + memset(input, 0, sizeof(*input)); + input->partition_id = partition_id; + input->request_page = req_pfn; + input->response_page = rsp_pfn; + status = hv_do_hypercall(HVCALL_ISSUE_SNP_PSP_GUEST_REQUEST, input, + NULL); + local_irq_restore(flags); + + if (hv_result(status) == HV_STATUS_CALL_PENDING) + completion_handler(completion_data, &status); + + if (!hv_result_success(status)) { + pr_err("%s: status=%s partition_id=%llu\n", __func__, + hv_result_to_string(status), partition_id); + return hv_result_to_errno(status); + } + + return 0; +} +#endif + int hv_call_modify_spa_host_access(u64 partition_id, struct page **pages, u64 page_struct_count, u32 host_access, u32 flags, u8 acquire) -- 2.43.0
