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hmp: gva2gpa debug command

Add a gva2gpa command purely for debug which performs
address translation on the gva, the existing gpa2hva
command can then also be used to find it in the qemu
userspace; e.g.

(qemu) info registers
.... RSP=ffffffff81c03e98
....
(qemu) gva2gpa 0xffffffff81c03e98
gpa: 0x1c03e98
(qemu) gpa2hva 0x1c03e98
Host virtual address for 0x1c03e98 (pc.ram) is 0x7f0599a03e98
(qemu) x/10x 0xffffffff81c03e98
ffffffff81c03e98: 0x81c03eb8 0xffffffff 0x8101ea3f 0xffffffff
ffffffff81c03ea8: 0x81d27b00 0xffffffff 0x00000000 0x00000000
ffffffff81c03eb8: 0x81c03ec8 0xffffffff

gdb -p ...qemu...
(gdb) x/10x 0x7f0599a03e98
0x7f0599a03e98:	0x81c03eb8	0xffffffff	0x8101ea3f	0xffffffff
0x7f0599a03ea8:	0x81d27b00	0xffffffff	0x00000000	0x00000000
0x7f0599a03eb8:	0x81c03ec8	0xffffffff

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190412152652.827-1-dgilbert@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
tags/v4.1.0-rc0
Dr. David Alan Gilbert 5 months ago
parent
commit
574d96933c
3 changed files with 38 additions and 0 deletions
  1. 15
    0
      hmp-commands.hx
  2. 22
    0
      monitor.c
  3. 1
    0
      tests/test-hmp.c

+ 15
- 0
hmp-commands.hx View File

@@ -585,6 +585,21 @@ STEXI
@findex gpa2hpa
Print the host physical address at which the guest's physical address @var{addr}
is mapped.
ETEXI

{
.name = "gva2gpa",
.args_type = "addr:l",
.params = "addr",
.help = "print the guest physical address corresponding to a guest virtual address",
.cmd = hmp_gva2gpa,
},

STEXI
@item gva2gpa @var{addr}
@findex gva2gpa
Print the guest physical address at which the guest's virtual address @var{addr}
is mapped based on the mapping for the current CPU.
ETEXI

{

+ 22
- 0
monitor.c View File

@@ -1673,6 +1673,28 @@ static void hmp_gpa2hva(Monitor *mon, const QDict *qdict)
memory_region_unref(mr);
}

static void hmp_gva2gpa(Monitor *mon, const QDict *qdict)
{
target_ulong addr = qdict_get_int(qdict, "addr");
MemTxAttrs attrs;
CPUState *cs = mon_get_cpu();
hwaddr gpa;

if (!cs) {
monitor_printf(mon, "No cpu\n");
return;
}

gpa = cpu_get_phys_page_attrs_debug(mon_get_cpu(),
addr & TARGET_PAGE_MASK, &attrs);
if (gpa == -1) {
monitor_printf(mon, "Unmapped\n");
} else {
monitor_printf(mon, "gpa: %#" HWADDR_PRIx "\n",
gpa + (addr & ~TARGET_PAGE_MASK));
}
}

#ifdef CONFIG_LINUX
static uint64_t vtop(void *ptr, Error **errp)
{

+ 1
- 0
tests/test-hmp.c View File

@@ -39,6 +39,7 @@ static const char *hmp_cmds[] = {
"dump-guest-memory /dev/null 0 4096",
"dump-guest-memory /dev/null",
"gdbserver",
"gva2gpa 0",
"hostfwd_add tcp::43210-:43210",
"hostfwd_remove tcp::43210-:43210",
"i /w 0",

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