From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5FF5D3D969E; Mon, 31 Aug 2026 11:27:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788175654; cv=none; b=C60F6UJaHY/nFo3FBXzV71PFFzM83kXjg42BofWe8BsfcehtnuqWTkynfuvGCAR4POq2ypdH4Lpxg4Ry4tKRwX7gHYZ3yNQQ3QGk2BBskTQ/SkLZsGuKqwTxQmWxjucdDOe5bVp5bn9WgsV7jEurkJh5dMCjcCzbvo9ge2YSX8g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788175654; c=relaxed/simple; bh=G379DeWauHDmzmF7lpbizwofQaiMFB9YBLElaksYdLM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gnMzE+YTWfX9/qKE/SvlkgDcorPfZjxvv6yO7r+0v7Ajwc16F+lI/kKrbzKcDoV03WlC0u3UrnoHgAimfbyEzf6T3DjHlq7FDjIJt6xy+EYqH1vtE9wQNiaKH87V/T5bmr19pqceIuiCuEBkUvua3hy2YsEQa8pw6M8gyx32vew= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=Ucmr4sI4; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="Ucmr4sI4" Received: from weh-cvm-dev-vm.y50bckvjo0hefgfnzfztsfttff.phxx.internal.cloudapp.net (unknown [20.169.55.37]) by linux.microsoft.com (Postfix) with ESMTPSA id 6496020B7128; Mon, 31 Aug 2026 04:26:57 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 6496020B7128 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1788175617; bh=34LYOHIDluIv/oadO2BSCqCxesCz1hVFlh9owlW9JGE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ucmr4sI4ydhZ8Qkl+eGWIK4mxoSJzTpnGEUvFJXKqKF7+snmVBzeT4AOkmvUtCLXh UCdHrUzfYpodbjOufh93Q8BnmLd823fAnN+HJ8XIFcUEfrk8BjjTK1RcacQY7Mi8xs m+qlP2VPHD8QDgIRBziMChV2NjamTYq1wyKuBH68= From: Wei Hu To: linux-hyperv@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li Subject: [PATCH v4 4/9] mshv: add SEV-SNP PSP request hypercall Date: Mon, 31 Aug 2026 11:26:42 +0000 Message-ID: <20260831112704.2851147-5-weh@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260831112704.2851147-1-weh@linux.microsoft.com> References: <20260825040505.826600-1-weh@linux.microsoft.com> <20260831112704.2851147-1-weh@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wei Liu 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 --- drivers/hv/mshv_root.h | 8 +++++++ drivers/hv/mshv_root_hv_call.c | 41 ++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h index a1059b578a39..2150019b588c 100644 --- a/drivers/hv/mshv_root.h +++ b/drivers/hv/mshv_root.h @@ -388,4 +388,12 @@ 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 1fa644e0e437..fca2419df397 100644 --- a/drivers/hv/mshv_root_hv_call.c +++ b/drivers/hv/mshv_root_hv_call.c @@ -1040,6 +1040,47 @@ 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); + + /* Hyper-V consumes the input before returning CALL_PENDING. */ + if (hv_result(status) == HV_STATUS_CALL_PENDING) + completion_handler(completion_data, &status); + + if (!hv_result_success(status)) { + pr_err_ratelimited("%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