diff options
| -rw-r--r-- | hmp-commands.hx | 32 | ||||
| -rw-r--r-- | monitor.c | 101 |
2 files changed, 133 insertions, 0 deletions
diff --git a/hmp-commands.hx b/hmp-commands.hx index 88192817b2..0aca984261 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -526,6 +526,38 @@ Dump 80 16 bit values at the start of the video memory. ETEXI { + .name = "gpa2hva", + .args_type = "addr:l", + .params = "addr", + .help = "print the host virtual address corresponding to a guest physical address", + .cmd = hmp_gpa2hva, + }, + +STEXI +@item gpa2hva @var{addr} +@findex gpa2hva +Print the host virtual address at which the guest's physical address @var{addr} +is mapped. +ETEXI + +#ifdef CONFIG_LINUX + { + .name = "gpa2hpa", + .args_type = "addr:l", + .params = "addr", + .help = "print the host physical address corresponding to a guest physical address", + .cmd = hmp_gpa2hpa, + }, +#endif + +STEXI +@item gpa2hpa @var{addr} +@findex gpa2hpa +Print the host physical address at which the guest's physical address @var{addr} +is mapped. +ETEXI + + { .name = "p|print", .args_type = "fmt:/,val:l", .params = "/fmt expr", @@ -1421,6 +1421,107 @@ static void hmp_physical_memory_dump(Monitor *mon, const QDict *qdict) memory_dump(mon, count, format, size, addr, 1); } +static void *gpa2hva(MemoryRegion **p_mr, hwaddr addr, Error **errp) +{ + MemoryRegionSection mrs = memory_region_find(get_system_memory(), + addr, 1); + + if (!mrs.mr) { + error_setg(errp, "No memory is mapped at address 0x%" HWADDR_PRIx, addr); + return NULL; + } + + if (!memory_region_is_ram(mrs.mr) && !memory_region_is_romd(mrs.mr)) { + error_setg(errp, "Memory at address 0x%" HWADDR_PRIx "is not RAM", addr); + memory_region_unref(mrs.mr); + return NULL; + } + + *p_mr = mrs.mr; + return qemu_map_ram_ptr(mrs.mr->ram_block, mrs.offset_within_region); +} + +static void hmp_gpa2hva(Monitor *mon, const QDict *qdict) +{ + hwaddr addr = qdict_get_int(qdict, "addr"); + Error *local_err = NULL; + MemoryRegion *mr = NULL; + void *ptr; + + ptr = gpa2hva(&mr, addr, &local_err); + if (local_err) { + error_report_err(local_err); + return; + } + + monitor_printf(mon, "Host virtual address for 0x%" HWADDR_PRIx + " (%s) is %p\n", + addr, mr->name, ptr); + + memory_region_unref(mr); +} + +#ifdef CONFIG_LINUX +static uint64_t vtop(void *ptr, Error **errp) +{ + uint64_t pinfo; + uint64_t ret = -1; + uintptr_t addr = (uintptr_t) ptr; + uintptr_t pagesize = getpagesize(); + off_t offset = addr / pagesize * sizeof(pinfo); + int fd; + + fd = open("/proc/self/pagemap", O_RDONLY); + if (fd == -1) { + error_setg_errno(errp, errno, "Cannot open /proc/self/pagemap"); + return -1; + } + + /* Force copy-on-write if necessary. */ + atomic_add((uint8_t *)ptr, 0); + + if (pread(fd, &pinfo, sizeof(pinfo), offset) != sizeof(pinfo)) { + error_setg_errno(errp, errno, "Cannot read pagemap"); + goto out; + } + if ((pinfo & (1ull << 63)) == 0) { + error_setg(errp, "Page not present"); + goto out; + } + ret = ((pinfo & 0x007fffffffffffffull) * pagesize) | (addr & (pagesize - 1)); + +out: + close(fd); + return ret; +} + +static void hmp_gpa2hpa(Monitor *mon, const QDict *qdict) +{ + hwaddr addr = qdict_get_int(qdict, "addr"); + Error *local_err = NULL; + MemoryRegion *mr = NULL; + void *ptr; + uint64_t physaddr; + + ptr = gpa2hva(&mr, addr, &local_err); + if (local_err) { + error_report_err(local_err); + return; + } + + physaddr = vtop(ptr, &local_err); + if (local_err) { + error_report_err(local_err); + } else { + monitor_printf(mon, "Host physical address for 0x%" HWADDR_PRIx + " (%s) is 0x%" PRIx64 "\n", + addr, mr->name, (uint64_t) physaddr); + } + + memory_region_unref(mr); +} +#endif + static void do_print(Monitor *mon, const QDict *qdict) { int format = qdict_get_int(qdict, "format"); |