From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:31304 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725792AbgGTNgJ (ORCPT ); Mon, 20 Jul 2020 09:36:09 -0400 From: Janosch Frank Subject: [kvm-unit-tests PATCH v2] s390x: Ultavisor guest API test Date: Mon, 20 Jul 2020 09:35:59 -0400 Message-Id: <20200720133559.69898-1-frankja@linux.ibm.com> In-Reply-To: <20200717145813.62573-4-frankja@linux.ibm.com> References: <20200717145813.62573-4-frankja@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: kvm@vger.kernel.org Cc: thuth@redhat.com, linux-s390@vger.kernel.org, david@redhat.com, borntraeger@de.ibm.com, cohuck@redhat.com, imbrenda@linux.ibm.com Test the error conditions of guest 2 Ultravisor calls, namely: * Query Ultravisor information * Set shared access * Remove shared access Signed-off-by: Janosch Frank Reviewed-by: Claudio Imbrenda --- lib/s390x/asm/uv.h | 68 +++++++++++++++++++ s390x/Makefile | 1 + s390x/unittests.cfg | 3 + s390x/uv-guest.c | 158 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 230 insertions(+) create mode 100644 lib/s390x/asm/uv.h create mode 100644 s390x/uv-guest.c diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h new file mode 100644 index 0000000..14ab5cc --- /dev/null +++ b/lib/s390x/asm/uv.h @@ -0,0 +1,68 @@ +/* + * s390x Ultravisor related definitions + * + * Copyright (c) 2020 IBM Corp + * + * Authors: + * Janosch Frank + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2. + */ +#ifndef UV_H +#define UV_H + +#define UVC_RC_EXECUTED 0x0001 +#define UVC_RC_INV_CMD 0x0002 +#define UVC_RC_INV_STATE 0x0003 +#define UVC_RC_INV_LEN 0x0005 +#define UVC_RC_NO_RESUME 0x0007 + +#define UVC_CMD_QUI 0x0001 +#define UVC_CMD_SET_SHARED_ACCESS 0x1000 +#define UVC_CMD_REMOVE_SHARED_ACCESS 0x1001 + +/* Bits in installed uv calls */ +enum uv_cmds_inst { + BIT_UVC_CMD_QUI = 0, + BIT_UVC_CMD_SET_SHARED_ACCESS = 8, + BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9, +}; + +struct uv_cb_header { + u16 len; + u16 cmd; /* Command Code */ + u16 rc; /* Response Code */ + u16 rrc; /* Return Reason Code */ +} __attribute__((packed)) __attribute__((aligned(8))); + +struct uv_cb_qui { + struct uv_cb_header header; + u64 reserved08; + u64 inst_calls_list[4]; + u64 reserved30[15]; +} __attribute__((packed)) __attribute__((aligned(8))); + +struct uv_cb_share { + struct uv_cb_header header; + u64 reserved08[3]; + u64 paddr; + u64 reserved28; +} __attribute__((packed)) __attribute__((aligned(8))); + +static inline int uv_call(unsigned long r1, unsigned long r2) +{ + int cc; + + asm volatile( + "0: .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n" + " brc 3,0b\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "=d" (cc) + : [r1] "a" (r1), [r2] "a" (r2) + : "memory", "cc"); + return cc; +} + +#endif diff --git a/s390x/Makefile b/s390x/Makefile index 0f54bf4..c2213ad 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -18,6 +18,7 @@ tests += $(TEST_DIR)/skrf.elf tests += $(TEST_DIR)/smp.elf tests += $(TEST_DIR)/sclp.elf tests += $(TEST_DIR)/css.elf +tests += $(TEST_DIR)/uv-guest.elf tests_binary = $(patsubst %.elf,%.bin,$(tests)) all: directories test_cases test_cases_binary diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg index b35269b..38c3257 100644 --- a/s390x/unittests.cfg +++ b/s390x/unittests.cfg @@ -92,3 +92,6 @@ extra_params = -device virtio-net-ccw [skrf] file = skrf.elf smp = 2 + +[uv-guest] +file = uv-guest.elf \ No newline at end of file diff --git a/s390x/uv-guest.c b/s390x/uv-guest.c new file mode 100644 index 0000000..079e2a3 --- /dev/null +++ b/s390x/uv-guest.c @@ -0,0 +1,158 @@ +/* + * Guest Ultravisor Call tests + * + * Copyright (c) 2020 IBM Corp + * + * Authors: + * Janosch Frank + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2. + */ + +#include +#include +#include +#include +#include +#include +#include + +static unsigned long page; + +static inline int share(unsigned long addr, u16 cmd) +{ + struct uv_cb_share uvcb = { + .header.cmd = cmd, + .header.len = sizeof(uvcb), + .paddr = addr + }; + + uv_call(0, (u64)&uvcb); + return uvcb.header.rc; +} + +static inline int uv_set_shared(unsigned long addr) +{ + return share(addr, UVC_CMD_SET_SHARED_ACCESS); +} + +static inline int uv_remove_shared(unsigned long addr) +{ + return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS); +} + +static void test_priv(void) +{ + struct uv_cb_header uvcb = {}; + + report_prefix_push("privileged"); + + report_prefix_push("query"); + expect_pgm_int(); + uvcb.cmd = UVC_CMD_QUI; + uvcb.len = sizeof(struct uv_cb_qui); + enter_pstate(); + uv_call(0, (u64)&uvcb); + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); + report_prefix_pop(); + + report_prefix_push("share"); + expect_pgm_int(); + enter_pstate(); + uv_set_shared((unsigned long)page); + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); + report_prefix_pop(); + + report_prefix_push("unshare"); + expect_pgm_int(); + enter_pstate(); + uv_remove_shared((unsigned long)page); + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); + report_prefix_pop(); + + report_prefix_pop(); +} + +static void test_query(void) +{ + struct uv_cb_qui uvcb = { + .header.cmd = UVC_CMD_QUI, + .header.len = sizeof(uvcb) - 8, + }; + + report_prefix_push("query"); + uv_call(0, (u64)&uvcb); + report(uvcb.header.rc == UVC_RC_INV_LEN, "length"); + + uvcb.header.len = sizeof(uvcb); + uv_call(0, (u64)&uvcb); + report(uvcb.header.rc == UVC_RC_EXECUTED, "successful query"); + + /* + * These bits have been introduced with the very first + * Ultravisor version and are expected to always be available + * because they are basic building blocks. + */ + report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_QUI)), + "query indicated"); + report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_SET_SHARED_ACCESS)), + "share indicated"); + report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_REMOVE_SHARED_ACCESS)), + "unshare indicated"); + report_prefix_pop(); +} + +static void test_sharing(void) +{ + struct uv_cb_share uvcb = { + .header.cmd = UVC_CMD_SET_SHARED_ACCESS, + .header.len = sizeof(uvcb) - 8, + }; + + report_prefix_push("share"); + uv_call(0, (u64)&uvcb); + report(uvcb.header.rc == UVC_RC_INV_LEN, "length"); + report(uv_set_shared(page) == UVC_RC_EXECUTED, "share"); + report_prefix_pop(); + + report_prefix_push("unshare"); + uvcb.header.cmd = UVC_CMD_REMOVE_SHARED_ACCESS; + uv_call(0, (u64)&uvcb); + report(uvcb.header.rc == UVC_RC_INV_LEN, "length"); + report(uv_remove_shared(page) == UVC_RC_EXECUTED, "unshare"); + report_prefix_pop(); + + report_prefix_pop(); +} + +static void test_invalid(void) +{ + struct uv_cb_header uvcb = { + .len = 16, + .cmd = 0x4242, + }; + + uv_call(0, (u64)&uvcb); + report(uvcb.rc == UVC_RC_INV_CMD, "invalid command"); +} + +int main(void) +{ + bool has_uvc = test_facility(158); + + report_prefix_push("uvc"); + if (!has_uvc) { + report_skip("Ultravisor call facility is not available"); + goto done; + } + + page = (unsigned long)alloc_page(); + test_priv(); + test_invalid(); + test_query(); + test_sharing(); + free_page((void *)page); +done: + return report_summary(); +} -- 2.25.1