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hmp: gva2gpa debug command

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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>
This commit is contained in:
Dr. David Alan Gilbert 2019-04-12 16:26:52 +01:00
parent b4e492db03
commit 574d96933c
3 changed files with 38 additions and 0 deletions
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15
hmp-commands.hx
View file

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

22
monitor.c
View file

@ -1673,6 +1673,28 @@ static void hmp_gpa2hva(Monitor *mon, const QDict *qdict)
memory_region_unref(mr); 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 #ifdef CONFIG_LINUX
static uint64_t vtop(void *ptr, Error **errp) static uint64_t vtop(void *ptr, Error **errp)
{ {

1
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 0 4096",
"dump-guest-memory /dev/null", "dump-guest-memory /dev/null",
"gdbserver", "gdbserver",
"gva2gpa 0",
"hostfwd_add tcp::43210-:43210", "hostfwd_add tcp::43210-:43210",
"hostfwd_remove tcp::43210-:43210", "hostfwd_remove tcp::43210-:43210",
"i /w 0", "i /w 0",