Re: [PATCH v2 2/3] tpm-ppi: page-align PPI RAM

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Marc-André Lureau (marcandre.lureau@redhat.com) wrote:
> post-copy migration fails on destination with error such as:
> 2019-12-26T10:22:44.714644Z qemu-kvm: ram_block_discard_range:
> Unaligned start address: 0x559d2afae9a0

Ah good, we got a sane error message!

> Use qemu_memalign() to constrain the PPI RAM memory alignment.
> 
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/tpm/tpm_ppi.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/tpm/tpm_ppi.c b/hw/tpm/tpm_ppi.c
> index ff314592b4..6d9c1a3e40 100644
> --- a/hw/tpm/tpm_ppi.c
> +++ b/hw/tpm/tpm_ppi.c
> @@ -43,7 +43,8 @@ void tpm_ppi_reset(TPMPPI *tpmppi)
>  void tpm_ppi_init(TPMPPI *tpmppi, struct MemoryRegion *m,
>                    hwaddr addr, Object *obj)
>  {
> -    tpmppi->buf = g_malloc0(HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));
> +    tpmppi->buf = qemu_memalign(qemu_real_host_page_size,
> +                                HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

>      memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
>                                        TPM_PPI_ADDR_SIZE, tpmppi->buf);
>      vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
> -- 
> 2.24.0.308.g228f53135a
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK