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Date: Mon, 02 Feb 2015 11:35:27 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 13/19] libqos/ahci: add ahci command size
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To: John Snow <jsnow@redhat.com>, qemu-devel@nongnu.org
Cc: famz@redhat.com, armbru@redhat.com, stefanha@redhat.com, mst@redhat.com



On 30/01/2015 19:42, John Snow wrote:
> +void ahci_command_set_sizes(AHCICommand *cmd, uint64_t xbytes,
> +                            unsigned prd_size)
> +{
> +    /* Each PRD can describe up to 4MiB, and must not be odd. */
> +    g_assert_cmphex(prd_size, <=, 4096 * 1024);
> +    g_assert_cmphex(prd_size & 0x01, ==, 0x00);
> +    cmd->prd_size = prd_size;
> +    cmd->xbytes = xbytes;
> +    cmd->fis.count = cpu_to_le16(cmd->xbytes / AHCI_SECTOR_SIZE);

Why do you need cpu_to_le16 here, instead of having it in the function
that writes the command to guest memory?

Paolo

> +    cmd->header.prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
> +}
> +