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SubjectRe: [PATCH v11 12/20] x86/virt/tdx: Allocate and set up PAMTs for TDMRs


On 4.06.23 г. 17:27 ч., Kai Huang wrote:

<snip>

> /*
> * Construct a list of TDMRs on the preallocated space in @tdmr_list
> * to cover all TDX memory regions in @tmb_list based on the TDX module
> @@ -487,10 +684,13 @@ static int construct_tdmrs(struct list_head *tmb_list,
> if (ret)
> return ret;
>
> + ret = tdmrs_set_up_pamt_all(tdmr_list, tmb_list,
> + sysinfo->pamt_entry_size);
> + if (ret)
> + return ret;
> /*
> * TODO:
> *
> - * - Allocate and set up PAMTs for each TDMR.
> * - Designate reserved areas for each TDMR.
> *
> * Return -EINVAL until constructing TDMRs is done
> @@ -547,6 +747,11 @@ static int init_tdx_module(void)
> * Return error before all steps are done.
> */
> ret = -EINVAL;
> + if (ret)
> + tdmrs_free_pamt_all(&tdx_tdmr_list);
> + else
> + pr_info("%lu KBs allocated for PAMT.\n",
> + tdmrs_count_pamt_pages(&tdx_tdmr_list) * 4);

Why not put the pr_info right after the 'if (ret)' check following
tdmrs_setup_pamt_all(). And make the tdmrs_free_pamt_all call
unconditional.

It seems the main reason for having a bunch of conditionals in the exit
reason is that you share the put_online_mems(); in both the success and
failure cases. If you simply add :


put_online_mems();
return 0;

// failure labels follow

Then you can make do without the if (ret) checks and have straight line
code doing the error handling.

> out_free_tdmrs:
> if (ret)
> free_tdmr_list(&tdx_tdmr_list);
> diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
> index c20848e76469..e8110e1a9980 100644
> --- a/arch/x86/virt/vmx/tdx/tdx.h
> +++ b/arch/x86/virt/vmx/tdx/tdx.h
> @@ -133,6 +133,7 @@ struct tdx_memblock {
> struct list_head list;
> unsigned long start_pfn;
> unsigned long end_pfn;
> + int nid;
> };
>
> struct tdmr_info_list {

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