Add functions to simply print some basic state information in selftests.
The output can be enabled by setting:
#define TH_LOG_ENABLED 1 #define DEBUG 1
* print_psw: current SIE state description and VM run state * print_hex_bytes: print memory with some counting markers * print_hex: PRINT_HEX with 512 bytes * print_run: use print_psw and print_hex to print contents of VM run state and SIE state description * print_regs: print content of general and control registers
All prints use pr_debug for the output and can be configured using DEBUG.
Signed-off-by: Christoph Schlameuss schlameuss@linux.ibm.com --- .../selftests/kvm/include/s390x/debug_print.h | 78 +++++++++++++++++++ .../selftests/kvm/s390x/ucontrol_test.c | 1 + 2 files changed, 79 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/s390x/debug_print.h
diff --git a/tools/testing/selftests/kvm/include/s390x/debug_print.h b/tools/testing/selftests/kvm/include/s390x/debug_print.h new file mode 100644 index 000000000000..7cc21596398e --- /dev/null +++ b/tools/testing/selftests/kvm/include/s390x/debug_print.h @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Definition for kernel virtual machines on s390x + * + * Copyright IBM Corp. 2024 + * + * Authors: + * Christoph Schlameuss schlameuss@linux.ibm.com + */ + +#ifndef SELFTEST_KVM_DEBUG_PRINT_H +#define SELFTEST_KVM_DEBUG_PRINT_H + +#include "kvm_util.h" +#include "sie.h" + +static inline void print_hex_bytes(const char *name, u64 page, size_t len) +{ + pr_debug("%s (%p)\t\t8-0x08 12-0x0c 16-0x10 20-0x14 24-0x18 28-0x1c", + name, (void *)page); + for (u8 pp_row = 0; pp_row < (len / 32); pp_row++) { + pr_debug("\n %3d 0x%.3x ", pp_row * 32, pp_row * 32); + for (u8 pp_block = 0; pp_block < 8; pp_block++) + pr_debug(" %8x", *(((u32 *)page) + 8 * pp_row + pp_block)); + } + pr_debug("\n"); +} + +static inline void print_hex(const char *name, u64 page) +{ + print_hex_bytes(name, page, 512); +} + +static inline void print_psw(struct kvm_run *run, struct kvm_s390_sie_block *sie_block) +{ + pr_debug("flags:0x%x psw:0x%.16llx:0x%.16llx exit:%u %s\n", + run->flags, + run->psw_mask, run->psw_addr, + run->exit_reason, exit_reason_str(run->exit_reason)); + pr_debug("sie_block psw:0x%.16llx:0x%.16llx\n", + sie_block->psw_mask, sie_block->psw_addr); +} + +static inline void print_run(struct kvm_run *run, struct kvm_s390_sie_block *sie_block) +{ + print_hex("run", (u64)run); + print_hex("sie_block", (u64)sie_block); + print_psw(run, sie_block); +} + +static inline void print_regs(int vcpu_fd) +{ + struct kvm_sregs sregs = {}; + struct kvm_regs regs = {}; + int i; + + if (ioctl(vcpu_fd, KVM_GET_REGS, ®s) != 0) + TEST_FAIL("get regs failed, %s", strerror(errno)); + pr_debug("gprs:\n"); + for (i = 0; i < 16; i += 4) + pr_debug("0x%.16llx 0x%.16llx 0x%.16llx 0x%.16llx\n", + regs.gprs[i], regs.gprs[i + 1], + regs.gprs[i + 2], regs.gprs[i + 3]); + if (ioctl(vcpu_fd, KVM_GET_SREGS, &sregs) != 0) + TEST_FAIL("get sregs failed, %s", strerror(errno)); + pr_debug("acrs:\n"); + for (i = 0; i < 16; i += 4) + pr_debug("0x%.8x 0x%.8x 0x%.8x 0x%.8x\n", + sregs.acrs[i], sregs.acrs[i + 1], + sregs.acrs[i + 2], sregs.acrs[i + 3]); + pr_debug("crs:\n"); + for (i = 0; i < 16; i += 4) + pr_debug("0x%.16llx 0x%.16llx 0x%.16llx 0x%.16llx\n", + sregs.crs[i], sregs.crs[i + 1], + sregs.crs[i + 2], sregs.crs[i + 3]); +} + +#endif /* SELFTEST_KVM_DEBUG_PRINT_H */ diff --git a/tools/testing/selftests/kvm/s390x/ucontrol_test.c b/tools/testing/selftests/kvm/s390x/ucontrol_test.c index 44945af6d47d..5c009ee27fd2 100644 --- a/tools/testing/selftests/kvm/s390x/ucontrol_test.c +++ b/tools/testing/selftests/kvm/s390x/ucontrol_test.c @@ -7,6 +7,7 @@ * Authors: * Christoph Schlameuss schlameuss@linux.ibm.com */ +#include "debug_print.h" #include "kselftest_harness.h" #include "kvm_util.h" #include "processor.h"