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Message-ID: <20230628141751.GH2438817@hirez.programming.kicks-ass.net>
Date: Wed, 28 Jun 2023 16:17:51 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Kai Huang <kai.huang@...el.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-mm@...ck.org, x86@...nel.org, dave.hansen@...el.com,
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Subject: Re: [PATCH v12 09/22] x86/virt/tdx: Use all system memory when
initializing TDX module as TDX memory
On Tue, Jun 27, 2023 at 02:12:39AM +1200, Kai Huang wrote:
> +static int tdx_memory_notifier(struct notifier_block *nb, unsigned long action,
> + void *v)
> +{
> + struct memory_notify *mn = v;
> +
> + if (action != MEM_GOING_ONLINE)
> + return NOTIFY_OK;
So offlining TDX memory is ok?
> +
> + /*
> + * Empty list means TDX isn't enabled. Allow any memory
> + * to go online.
> + */
> + if (list_empty(&tdx_memlist))
> + return NOTIFY_OK;
> +
> + /*
> + * The TDX memory configuration is static and can not be
> + * changed. Reject onlining any memory which is outside of
> + * the static configuration whether it supports TDX or not.
> + */
> + return is_tdx_memory(mn->start_pfn, mn->start_pfn + mn->nr_pages) ?
> + NOTIFY_OK : NOTIFY_BAD;
if (is_tdx_memory(...))
return NOTIFY_OK;
return NOTIFY_BAD;
> +}
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