linux-kernel - Re: [PATCH 2.6.21 1/3] x86

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Date:	Fri, 01 Jun 2007 12:39:33 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Chandramouli Narayanan <mouli@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, ak@...e.de,
	akpm@...ux-foundation.org, Randy Dunlap <randy.dunlap@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Yinghai Lu" <yhlu.kernel@...il.com>
Subject: Re: [PATCH 2.6.21 1/3] x86_64: EFI64 support


Sorry for the late replay I missed this patch series going by the first time.
> +static efi_status_t
> +phys_efi_set_virtual_address_map(unsigned long memory_map_size,
> +				 unsigned long descriptor_size,
> +				 u32 descriptor_version,
> +				 efi_memory_desc_t *virtual_map)
> +{
> +	efi_status_t status;
> +
> +	efi_call_phys_prelog();
> +	status = efi_call_phys(efi_phys.set_virtual_address_map,
> +					EFI_ARG_NUM_SET_VIRTUAL_ADDRESS_MAP,
> +					(unsigned long)memory_map_size,
> +					(unsigned long)descriptor_size,
> +					(unsigned long)descriptor_version, 
> +					(unsigned long)virtual_map);
> +	efi_call_phys_epilog();
> +	return status;
> +}

Please, Please kill this.

As far as I can tell virtual mode is incompatible with kexec.
It is unnecessary because none of the EFI calls are fast path.

Further I believe that using virtual addresses is likely to
make things more brittle.

So please drop the EFI virtual mode nonsense.

Thank you,
Eric
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