Re: [PATCH] x86/boot: Use EFI setup data if provided
On 03/25/19 at 06:47am, Junichi Nomura wrote:
> On 3/25/19 3:19 PM, Dave Young wrote:
> > On 03/25/19 at 02:01pm, Dave Young wrote:
> >> On 03/25/19 at 12:27am, Junichi Nomura wrote:
> >>> On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
> On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > in the early parsing code tries to search RSDP from EFI table but
> > whose address is virtual.
> >
> > Since kexec(1) provides physical address of config_table via
> > boot_params,
> > efi_get_rsdp_addr() should look for setup_data in the same way as
> > efi_systab_init() in arch/x86/platform/efi/efi.c does.
>
> If the kexec kernel should continue to use efi_systab_init() then you
> should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
> >>>
> >>> I'm not sure which way kexec devel is going. Added kexec list.
> >>> Here is the version that exits early in efi_get_rsdp_addr().
> >>>
> >>> [PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
> >>>
> >>> Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> >>> boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> >>> in the early parsing code tries to search RSDP from EFI table but
> >>> whose address is virtual.
> >>>
> >>> Normally kexec(1) provides physical address of config_table via
> >>> boot_params
> >>> and EFI code uses that during initialization.
> >>> For the early boot code, we just exit efi_get_rsdp_addr() early if the
> >>> kernel
> >>> is booted by kexec.
> >>>
> >>> Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> >>> boot_params")
> >>> Signed-off-by: Jun'ichi Nomura
> >>> Cc: Chao Fan
> >>> Cc: Borislav Petkov
> >>>
> >>> diff --git a/arch/x86/boot/compressed/acpi.c
> >>> b/arch/x86/boot/compressed/acpi.c
> >>> index 0ef4ad5..1cefc43 100644
> >>> --- a/arch/x86/boot/compressed/acpi.c
> >>> +++ b/arch/x86/boot/compressed/acpi.c
> >>> @@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
> >>> return addr;
> >>> }
> >>>
> >>> +static bool is_kexec_booted(void)
> >>> +{
> >>> + struct setup_data *data;
> >>> +
> >>> + /*
> >>> + * kexec-tools provides EFI setup data so that kexec-ed kernel
> >>> + * can find proper tables.
> >>> + */
> >>> + data = (struct setup_data *) boot_params->hdr.setup_data;
> >>> + while (data) {
> >>> + if (data->type == SETUP_EFI)
> >>> + return true;
> >>> + data = (struct setup_data *) data->next;
> >>> + }
> >>> +
> >>> + return false;
> >>> +}
> >>> +
> >>> /* Search EFI system tables for RSDP. */
> >>> static acpi_physical_address efi_get_rsdp_addr(void)
> >>> {
> >>> @@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> >>> int size, i;
> >>> char *sig;
> >>>
> >>> + /* If the system is kexec-booted, poking EFI systab may not work. */
> >>> + if (is_kexec_booted())
> >>> + return 0;
> >>> +
> >>> ei = &boot_params->efi_info;
> >>> sig = (char *)&ei->efi_loader_signature;
> >>>
> >>>
> >>> ___
> >>> kexec mailing list
> >>> kexec@lists.infradead.org
> >>> http://lists.infradead.org/mailman/listinfo/kexec
> >>
> >> Good catch, this way looks good to me. But the function
> >> is_kexec_booted can be compiled when #ifdef CONFIG_EFI
> >>
> >> Otherwise:
> >>
> >> Acked-by: Dave Young
> >>
> >
> > Hold on, I replied too quick. One question is does the above patch
> > passed your test? It can workaround and skip the wrong phys addr
> > issue, but the acpi early parsing still fails because efi_get_rsdp_addr
> > return 0?
>
> The patch works for me.
> Early parsing fails with the 2nd patch but it boots fine.
> EFI initialization is done later without boot_params->acpi_rsdp_addr.
> I think that's how v5.0 and earlier kernels work.
Ok, thanks
>
> > If this is the case you may need go with your old patch.
> >
> > I think normally people do not see this bug, because kernel will set the
> > rsdp in boot_params->acpi_rsdp_addr. Maybe you are testing with
>
> I think it's only done for file-based kexec interface.
Saw Kairui's another reply, yes, kexec-tools need a patch to fill the
value as well then.
I would vote for a repost of your old patch with some #ifdef
Thanks
Dave
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Re: [PATCH] x86/boot: Use EFI setup data if provided
On 3/25/19 3:19 PM, Dave Young wrote:
> On 03/25/19 at 02:01pm, Dave Young wrote:
>> On 03/25/19 at 12:27am, Junichi Nomura wrote:
>>> On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> in the early parsing code tries to search RSDP from EFI table but
> whose address is virtual.
>
> Since kexec(1) provides physical address of config_table via boot_params,
> efi_get_rsdp_addr() should look for setup_data in the same way as
> efi_systab_init() in arch/x86/platform/efi/efi.c does.
If the kexec kernel should continue to use efi_systab_init() then you
should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
>>>
>>> I'm not sure which way kexec devel is going. Added kexec list.
>>> Here is the version that exits early in efi_get_rsdp_addr().
>>>
>>> [PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
>>>
>>> Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
>>> boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
>>> in the early parsing code tries to search RSDP from EFI table but
>>> whose address is virtual.
>>>
>>> Normally kexec(1) provides physical address of config_table via boot_params
>>> and EFI code uses that during initialization.
>>> For the early boot code, we just exit efi_get_rsdp_addr() early if the
>>> kernel
>>> is booted by kexec.
>>>
>>> Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
>>> boot_params")
>>> Signed-off-by: Jun'ichi Nomura
>>> Cc: Chao Fan
>>> Cc: Borislav Petkov
>>>
>>> diff --git a/arch/x86/boot/compressed/acpi.c
>>> b/arch/x86/boot/compressed/acpi.c
>>> index 0ef4ad5..1cefc43 100644
>>> --- a/arch/x86/boot/compressed/acpi.c
>>> +++ b/arch/x86/boot/compressed/acpi.c
>>> @@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
>>> return addr;
>>> }
>>>
>>> +static bool is_kexec_booted(void)
>>> +{
>>> + struct setup_data *data;
>>> +
>>> + /*
>>> +* kexec-tools provides EFI setup data so that kexec-ed kernel
>>> +* can find proper tables.
>>> +*/
>>> + data = (struct setup_data *) boot_params->hdr.setup_data;
>>> + while (data) {
>>> + if (data->type == SETUP_EFI)
>>> + return true;
>>> + data = (struct setup_data *) data->next;
>>> + }
>>> +
>>> + return false;
>>> +}
>>> +
>>> /* Search EFI system tables for RSDP. */
>>> static acpi_physical_address efi_get_rsdp_addr(void)
>>> {
>>> @@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
>>> int size, i;
>>> char *sig;
>>>
>>> + /* If the system is kexec-booted, poking EFI systab may not work. */
>>> + if (is_kexec_booted())
>>> + return 0;
>>> +
>>> ei = &boot_params->efi_info;
>>> sig = (char *)&ei->efi_loader_signature;
>>>
>>>
>>> ___
>>> kexec mailing list
>>> kexec@lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/kexec
>>
>> Good catch, this way looks good to me. But the function
>> is_kexec_booted can be compiled when #ifdef CONFIG_EFI
>>
>> Otherwise:
>>
>> Acked-by: Dave Young
>>
>
> Hold on, I replied too quick. One question is does the above patch
> passed your test? It can workaround and skip the wrong phys addr
> issue, but the acpi early parsing still fails because efi_get_rsdp_addr
> return 0?
The patch works for me.
Early parsing fails with the 2nd patch but it boots fine.
EFI initialization is done later without boot_params->acpi_rsdp_addr.
I think that's how v5.0 and earlier kernels work.
> If this is the case you may need go with your old patch.
>
> I think normally people do not see this bug, because kernel will set the
> rsdp in boot_params->acpi_rsdp_addr. Maybe you are testing with
I think it's only done for file-based kexec interface.
> different kernel versions, eg.
>
> old kernel kexec to new kernel.
>
> And the old kernel does not set boot_params->acpi_rsdp_addr
>
> Is this correct?
I'm testing kexec from v5.1-rc1 to v5.1-rc1, i.e. same kernel.
--
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.
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Re: [PATCH] x86/boot: Use EFI setup data if provided
On Mon, Mar 25, 2019 at 2:20 PM Dave Young wrote:
>
> On 03/25/19 at 02:01pm, Dave Young wrote:
> > On 03/25/19 at 12:27am, Junichi Nomura wrote:
> > > On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
> > > > On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> > > > > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > > > > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > > > > in the early parsing code tries to search RSDP from EFI table but
> > > > > whose address is virtual.
> > > > >
> > > > > Since kexec(1) provides physical address of config_table via
> > > > > boot_params,
> > > > > efi_get_rsdp_addr() should look for setup_data in the same way as
> > > > > efi_systab_init() in arch/x86/platform/efi/efi.c does.
> > > >
> > > > If the kexec kernel should continue to use efi_systab_init() then you
> > > > should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
> > >
> > > I'm not sure which way kexec devel is going. Added kexec list.
> > > Here is the version that exits early in efi_get_rsdp_addr().
> > >
> > > [PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
> > >
> > > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > > in the early parsing code tries to search RSDP from EFI table but
> > > whose address is virtual.
> > >
> > > Normally kexec(1) provides physical address of config_table via
> > > boot_params
> > > and EFI code uses that during initialization.
> > > For the early boot code, we just exit efi_get_rsdp_addr() early if the
> > > kernel
> > > is booted by kexec.
> > >
> > > Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > > boot_params")
> > > Signed-off-by: Jun'ichi Nomura
> > > Cc: Chao Fan
> > > Cc: Borislav Petkov
> > >
> > > diff --git a/arch/x86/boot/compressed/acpi.c
> > > b/arch/x86/boot/compressed/acpi.c
> > > index 0ef4ad5..1cefc43 100644
> > > --- a/arch/x86/boot/compressed/acpi.c
> > > +++ b/arch/x86/boot/compressed/acpi.c
> > > @@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
> > > return addr;
> > > }
> > >
> > > +static bool is_kexec_booted(void)
> > > +{
> > > + struct setup_data *data;
> > > +
> > > + /*
> > > +* kexec-tools provides EFI setup data so that kexec-ed kernel
> > > +* can find proper tables.
> > > +*/
> > > + data = (struct setup_data *) boot_params->hdr.setup_data;
> > > + while (data) {
> > > + if (data->type == SETUP_EFI)
> > > + return true;
> > > + data = (struct setup_data *) data->next;
> > > + }
> > > +
> > > + return false;
> > > +}
> > > +
> > > /* Search EFI system tables for RSDP. */
> > > static acpi_physical_address efi_get_rsdp_addr(void)
> > > {
> > > @@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> > > int size, i;
> > > char *sig;
> > >
> > > + /* If the system is kexec-booted, poking EFI systab may not work. */
> > > + if (is_kexec_booted())
> > > + return 0;
> > > +
> > > ei = &boot_params->efi_info;
> > > sig = (char *)&ei->efi_loader_signature;
> > >
> > >
> > > ___
> > > kexec mailing list
> > > kexec@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/kexec
> >
> > Good catch, this way looks good to me. But the function
> > is_kexec_booted can be compiled when #ifdef CONFIG_EFI
> >
> > Otherwise:
> >
> > Acked-by: Dave Young
> >
>
> Hold on, I replied too quick. One question is does the above patch
> passed your test? It can workaround and skip the wrong phys addr
> issue, but the acpi early parsing still fails because efi_get_rsdp_addr
> return 0?
>
> If this is the case you may need go with your old patch.
>
> I think normally people do not see this bug, because kernel will set the
> rsdp in boot_params->acpi_rsdp_addr. Maybe you are testing with
> different kernel versions, eg.
>
> old kernel kexec to new kernel.
>
> And the old kernel does not set boot_params->acpi_rsdp_addr
>
> Is this correct?
>
> Thanks
> Dave
Hi Dave, actually only kexec_file_load will always set the
boot_params->acpi_rsdp_addr. Can't guarantee how user space tools will
prepare the boot_prams if kexec_load is used, so it's should very
likely to happen.
And for the patch, I also think the first patch looks better, if we
just return 0 early in efi_get_rsdp_addr aren't we still failing to
parse the rsdp in early code?
--
Best Regards,
Kairui Song
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Re: [PATCH] x86/boot: Use EFI setup data if provided
On 03/25/19 at 02:01pm, Dave Young wrote:
> On 03/25/19 at 12:27am, Junichi Nomura wrote:
> > On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
> > > On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> > > > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > > > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > > > in the early parsing code tries to search RSDP from EFI table but
> > > > whose address is virtual.
> > > >
> > > > Since kexec(1) provides physical address of config_table via
> > > > boot_params,
> > > > efi_get_rsdp_addr() should look for setup_data in the same way as
> > > > efi_systab_init() in arch/x86/platform/efi/efi.c does.
> > >
> > > If the kexec kernel should continue to use efi_systab_init() then you
> > > should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
> >
> > I'm not sure which way kexec devel is going. Added kexec list.
> > Here is the version that exits early in efi_get_rsdp_addr().
> >
> > [PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
> >
> > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > in the early parsing code tries to search RSDP from EFI table but
> > whose address is virtual.
> >
> > Normally kexec(1) provides physical address of config_table via boot_params
> > and EFI code uses that during initialization.
> > For the early boot code, we just exit efi_get_rsdp_addr() early if the
> > kernel
> > is booted by kexec.
> >
> > Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > boot_params")
> > Signed-off-by: Jun'ichi Nomura
> > Cc: Chao Fan
> > Cc: Borislav Petkov
> >
> > diff --git a/arch/x86/boot/compressed/acpi.c
> > b/arch/x86/boot/compressed/acpi.c
> > index 0ef4ad5..1cefc43 100644
> > --- a/arch/x86/boot/compressed/acpi.c
> > +++ b/arch/x86/boot/compressed/acpi.c
> > @@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
> > return addr;
> > }
> >
> > +static bool is_kexec_booted(void)
> > +{
> > + struct setup_data *data;
> > +
> > + /*
> > +* kexec-tools provides EFI setup data so that kexec-ed kernel
> > +* can find proper tables.
> > +*/
> > + data = (struct setup_data *) boot_params->hdr.setup_data;
> > + while (data) {
> > + if (data->type == SETUP_EFI)
> > + return true;
> > + data = (struct setup_data *) data->next;
> > + }
> > +
> > + return false;
> > +}
> > +
> > /* Search EFI system tables for RSDP. */
> > static acpi_physical_address efi_get_rsdp_addr(void)
> > {
> > @@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> > int size, i;
> > char *sig;
> >
> > + /* If the system is kexec-booted, poking EFI systab may not work. */
> > + if (is_kexec_booted())
> > + return 0;
> > +
> > ei = &boot_params->efi_info;
> > sig = (char *)&ei->efi_loader_signature;
> >
> >
> > ___
> > kexec mailing list
> > kexec@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/kexec
>
> Good catch, this way looks good to me. But the function
> is_kexec_booted can be compiled when #ifdef CONFIG_EFI
>
> Otherwise:
>
> Acked-by: Dave Young
>
Hold on, I replied too quick. One question is does the above patch
passed your test? It can workaround and skip the wrong phys addr
issue, but the acpi early parsing still fails because efi_get_rsdp_addr
return 0?
If this is the case you may need go with your old patch.
I think normally people do not see this bug, because kernel will set the
rsdp in boot_params->acpi_rsdp_addr. Maybe you are testing with
different kernel versions, eg.
old kernel kexec to new kernel.
And the old kernel does not set boot_params->acpi_rsdp_addr
Is this correct?
Thanks
Dave
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Re: [PATCH] x86/boot: Use EFI setup data if provided
On 03/25/19 at 12:27am, Junichi Nomura wrote:
> On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
> > On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> > > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > > in the early parsing code tries to search RSDP from EFI table but
> > > whose address is virtual.
> > >
> > > Since kexec(1) provides physical address of config_table via boot_params,
> > > efi_get_rsdp_addr() should look for setup_data in the same way as
> > > efi_systab_init() in arch/x86/platform/efi/efi.c does.
> >
> > If the kexec kernel should continue to use efi_systab_init() then you
> > should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
>
> I'm not sure which way kexec devel is going. Added kexec list.
> Here is the version that exits early in efi_get_rsdp_addr().
>
> [PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
>
> Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> in the early parsing code tries to search RSDP from EFI table but
> whose address is virtual.
>
> Normally kexec(1) provides physical address of config_table via boot_params
> and EFI code uses that during initialization.
> For the early boot code, we just exit efi_get_rsdp_addr() early if the kernel
> is booted by kexec.
>
> Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in boot_params")
> Signed-off-by: Jun'ichi Nomura
> Cc: Chao Fan
> Cc: Borislav Petkov
>
> diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
> index 0ef4ad5..1cefc43 100644
> --- a/arch/x86/boot/compressed/acpi.c
> +++ b/arch/x86/boot/compressed/acpi.c
> @@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
> return addr;
> }
>
> +static bool is_kexec_booted(void)
> +{
> + struct setup_data *data;
> +
> + /*
> + * kexec-tools provides EFI setup data so that kexec-ed kernel
> + * can find proper tables.
> + */
> + data = (struct setup_data *) boot_params->hdr.setup_data;
> + while (data) {
> + if (data->type == SETUP_EFI)
> + return true;
> + data = (struct setup_data *) data->next;
> + }
> +
> + return false;
> +}
> +
> /* Search EFI system tables for RSDP. */
> static acpi_physical_address efi_get_rsdp_addr(void)
> {
> @@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> int size, i;
> char *sig;
>
> + /* If the system is kexec-booted, poking EFI systab may not work. */
> + if (is_kexec_booted())
> + return 0;
> +
> ei = &boot_params->efi_info;
> sig = (char *)&ei->efi_loader_signature;
>
>
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Good catch, this way looks good to me. But the function
is_kexec_booted can be compiled when #ifdef CONFIG_EFI
Otherwise:
Acked-by: Dave Young
Thanks
Dave
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Re: [PATCH] x86/boot: Use EFI setup data if provided
On Fri, Mar 22, 2019 at 04:23:28PM +0100, Borislav Petkov wrote:
> On Fri, Mar 22, 2019 at 11:03:43AM +, Junichi Nomura wrote:
> > Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
> > boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
> > in the early parsing code tries to search RSDP from EFI table but
> > whose address is virtual.
> >
> > Since kexec(1) provides physical address of config_table via boot_params,
> > efi_get_rsdp_addr() should look for setup_data in the same way as
> > efi_systab_init() in arch/x86/platform/efi/efi.c does.
>
> If the kexec kernel should continue to use efi_systab_init() then you
> should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.
I'm not sure which way kexec devel is going. Added kexec list.
Here is the version that exits early in efi_get_rsdp_addr().
[PATCH] x86/boot: Don't try to search RSDP from EFI when kexec-booted
Commit 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in
boot_params") broke kexec boot on EFI systems. efi_get_rsdp_addr()
in the early parsing code tries to search RSDP from EFI table but
whose address is virtual.
Normally kexec(1) provides physical address of config_table via boot_params
and EFI code uses that during initialization.
For the early boot code, we just exit efi_get_rsdp_addr() early if the kernel
is booted by kexec.
Fixes: 3a63f70bf4c3a ("x86/boot: Early parse RSDP and save it in boot_params")
Signed-off-by: Jun'ichi Nomura
Cc: Chao Fan
Cc: Borislav Petkov
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 0ef4ad5..1cefc43 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -44,6 +44,24 @@ static acpi_physical_address get_acpi_rsdp(void)
return addr;
}
+static bool is_kexec_booted(void)
+{
+ struct setup_data *data;
+
+ /*
+* kexec-tools provides EFI setup data so that kexec-ed kernel
+* can find proper tables.
+*/
+ data = (struct setup_data *) boot_params->hdr.setup_data;
+ while (data) {
+ if (data->type == SETUP_EFI)
+ return true;
+ data = (struct setup_data *) data->next;
+ }
+
+ return false;
+}
+
/* Search EFI system tables for RSDP. */
static acpi_physical_address efi_get_rsdp_addr(void)
{
@@ -57,6 +75,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
int size, i;
char *sig;
+ /* If the system is kexec-booted, poking EFI systab may not work. */
+ if (is_kexec_booted())
+ return 0;
+
ei = &boot_params->efi_info;
sig = (char *)&ei->efi_loader_signature;
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