From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:57640 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728348AbgGTKvT (ORCPT ); Mon, 20 Jul 2020 06:51:19 -0400 Date: Mon, 20 Jul 2020 12:49:38 +0200 From: Claudio Imbrenda Subject: Re: [kvm-unit-tests PATCH 3/3] s390x: Ultavisor guest API test Message-ID: <20200720124938.556220fe@ibm-vm> In-Reply-To: <20200717145813.62573-4-frankja@linux.ibm.com> References: <20200717145813.62573-1-frankja@linux.ibm.com> <20200717145813.62573-4-frankja@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Janosch Frank Cc: kvm@vger.kernel.org, thuth@redhat.com, linux-s390@vger.kernel.org, david@redhat.com, borntraeger@de.ibm.com, cohuck@redhat.com On Fri, 17 Jul 2020 10:58:13 -0400 Janosch Frank wrote: > Test the error conditions of guest 2 Ultravisor calls, namely: > * Query Ultravisor information > * Set shared access > * Remove shared access > > Signed-off-by: Janosch Frank > --- > lib/s390x/asm/uv.h | 68 +++++++++++++++++++ > s390x/Makefile | 1 + > s390x/unittests.cfg | 3 + > s390x/uv-guest.c | 156 > ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 228 > 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..0cb5fae > --- /dev/null > +++ b/s390x/uv-guest.c > @@ -0,0 +1,156 @@ > +/* > + * 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 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(0x42000); > + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); > + report_prefix_pop(); > + > + report_prefix_push("unshare"); > + expect_pgm_int(); > + enter_pstate(); > + uv_remove_shared(0x42000); I don't like using a hardwired address here (and above). Things can get messy if the address ends up outside memory or overlapping code. I think the best approach would be to declare a page aligned buffer and use that (or even allocate a 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) > +{ > + unsigned long mem = (unsigned long)alloc_page(); > + 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(mem) == 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(mem) == UVC_RC_EXECUTED, "unshare"); > + free_page((void *)mem); > + 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; > + } > + > + test_priv(); > + test_invalid(); > + test_query(); > + test_sharing(); > +done: > + return report_summary(); > +} once the above comment is addressed: Claudio Imbrenda