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tpm_tis: limit size of buffer from backend 

This is a preparatory patch for the subsequent ones where we
get rid of the flexibility of supporting any kind of buffer size
that the backend may support. We keep the size at 4096, which is
also the size the external emulator supports. So, limit the size
of the buffer we can support and pass it back to the backend.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Stefan Berger 2017-11-09 19:24:02 -05:00
parent 8a2306c7ed
commit 1af3d63ea3
1 changed files with 3 additions and 2 deletions
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5
hw/tpm/tpm_tis.c
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@ -1012,7 +1012,8 @@ static void tpm_tis_reset(DeviceState *dev)
int c;
s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
s->be_buffer_size = tpm_backend_get_buffer_size(s->be_driver);
s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->be_driver),
TPM_TIS_BUFFER_MAX);
tpm_backend_reset(s->be_driver);
@ -1044,7 +1045,7 @@ static void tpm_tis_reset(DeviceState *dev)
tpm_tis_realloc_buffer(&s->loc[c].r_buffer, s->be_buffer_size);
}
tpm_tis_do_startup_tpm(s, 0);
tpm_tis_do_startup_tpm(s, s->be_buffer_size);
}
static const VMStateDescription vmstate_tpm_tis = {