Commit 574d9693 authored by Dr. David Alan Gilbert's avatar Dr. David Alan Gilbert
Browse files

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: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190412152652.827-1-dgilbert@redhat.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
parent b4e492db

hmp-commands.hx

+15 −0
Original line number Diff line number Diff line
@@ -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



    {

monitor.c

+22 −0
Original line number Diff line number Diff line
@@ -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)

{

tests/test-hmp.c

+1 −0
Original line number Diff line number Diff line
@@ -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",