linux-kernel - Re: [PATCH Part2 v6 09/49] x86/fault: Add support to handle the RMP fault for user address

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Message-ID: <Ys1hrq+vFbxRJbra@kernel.org>
Date:   Tue, 12 Jul 2022 14:57:34 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Ashish Kalra <Ashish.Kalra@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
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        alpergun@...gle.com, dgilbert@...hat.com
Subject: Re: [PATCH Part2 v6 09/49] x86/fault: Add support to handle the RMP
 fault for user address

On Mon, Jun 20, 2022 at 11:03:43PM +0000, Ashish Kalra wrote:
> +/*
> + * Return 1 if the caller need to retry, 0 if it the address need to be split
> + * in order to resolve the fault.
> + */
> +static int handle_user_rmp_page_fault(struct pt_regs *regs, unsigned long error_code,
> +				      unsigned long address)
> +{
> +	int rmp_level, level;
> +	pte_t *pte;
> +	u64 pfn;
> +
> +	pte = lookup_address_in_mm(current->mm, address, &level);

As discussed in [1], the lookup should be done in kvm->mm, along the
lines of host_pfn_mapping_level().

[1] https://lore.kernel.org/kvm/YmwIi3bXr%2F1yhYV%2F@google.com/ 
|
BR, Jarkko