linux-kernel - Re: [PATCH 2/2] Suppress false "mtrr all empty" warning message when running as VMware guest

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Date:	Thu, 25 Sep 2008 10:13:45 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Yan Li" <elliot.li.tech@...il.com>
Cc:	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, joerg.roedel@....com,
	rjmaomao@...il.com, "Thomas Gleixner" <tglx@...utronix.de>,
	nancydreaming@...il.com
Subject: Re: [PATCH 2/2] Suppress false "mtrr all empty" warning message when running as VMware guest

On Thu, Sep 25, 2008 at 7:18 AM, Yan Li <elliot.li.tech@...il.com> wrote:
> On Wed, Sep 24, 2008 at 09:39:20AM -0700, Yinghai Lu wrote:
>> On Wed, Sep 24, 2008 at 5:24 AM, Yan Li <elliot.li.tech@...il.com> wrote:
>> > Since the mtrr empty was detected very early before we can use DMI or
>> > PCI to check whether we are running as a VMware guest or not, we now
>> > only print an info there. Warning will only be issued later when we
>> > are sure that we are not running as a VMware guest.
>> >
>> > mtrr_trim_uncached_memory() is modified to return meaningful codes for
>> > later warning decision.
>>
>> we have moved dmi_scan_machine() much early...
>>
>> so please check with latest tip/master to use
>> dmi_check_system with that.
>
> I checked your patch 1c6e5503 that moved dmi_scan_machine() earlier,
> but it's still behind mtrr_trim_uncached_memory(), so we still can't
> use DMI to check for VMware there.
>

you must be kidding!

...

        dmi_scan_machine();

        dmi_check_system(bad_bios_dmi_table);

#ifdef CONFIG_X86_32
        probe_roms();
#endif

        /* after parse_early_param, so could debug it */
        insert_resource(&iomem_resource, &code_resource);
        insert_resource(&iomem_resource, &data_resource);
        insert_resource(&iomem_resource, &bss_resource);

        if (efi_enabled)
                efi_init();

#ifdef CONFIG_X86_32
        if (ppro_with_ram_bug()) {
                e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
                                  E820_RESERVED);
                sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
                printk(KERN_INFO "fixed physical RAM map:\n");
                e820_print_map("bad_ppro");
        }
#else
        early_gart_iommu_check();
#endif

        /*
         * partially used pages are not usable - thus
         * we are rounding upwards:
         */
        max_pfn = e820_end_of_ram_pfn();

        /* preallocate 4k for mptable mpc */
        early_reserve_e820_mpc_new();
        /* update e820 for memory not covered by WB MTRRs */
        mtrr_bp_init();
        if (mtrr_trim_uncached_memory(max_pfn))
                max_pfn = e820_end_of_ram_pfn();
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