* [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
@ 2015-12-10 17:25 Laszlo Ersek
2015-12-10 18:53 ` Igor Mammedov
0 siblings, 1 reply; 7+ messages in thread
From: Laszlo Ersek @ 2015-12-10 17:25 UTC (permalink / raw)
To: qemu-devel
Cc: Ruiyu Ni, Eduardo Habkost, Michael S. Tsirkin, Paolo Bonzini,
Igor Mammedov, Richard Henderson
The ACPI specification (minimally versions 1.0b through 6.0) define the
FADT.CENTURY field as:
The RTC CMOS RAM index to the century of data value (hundred and
thousand year decimals). If this field contains a zero, then the RTC
centenary feature is not supported. If this field has a non-zero value,
then this field contains an index into RTC RAM space that OSPM can use
to program the centenary field.
The x86 targets generate ACPI payload, emulate an RTC
(CONFIG_MC146818RTC), and that RTC supports the "centenary feature" (see
occurrences of RTC_CENTURY in cmos_ioport_write() and cmos_ioport_read()
in "hw/timer/mc146818rtc.c".)
However, FADT.CENTURY is left at zero currently:
[06Ch 0108 1] RTC Century Index : 00
which -- according to analysis done by Ruiyu Ni at Intel -- should cause
Linux and Windows 8+ to think the RTC centenary feature is unavailable,
and cause Windows 7 to (incorrectly) assume that the offset to use is
constant 0x32. (0x32 happens to be the right value on QEMU, but Windows 7
is wrong to assume anything at all).
Exposing the right nonzero offset in FADT.CENTURY informs Linux and
Windows 8+ about the right capabilities of the hardware, plus it retrofits
our FADT to Windows 7's behavior.
Regression tested with the following guests (all UEFI installs):
- i386 Q35: Fedora 21 ("Fedlet" edition)
- x86_64:
- i440fx:
- Fedora 21
- RHEL 6 and 7
- Windows 7 and 10
- Windows Server 2008 R2 and 2012 R2
- Q35:
- Fedora 22
- Windows 8.1
Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
hw/i386/acpi-build.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 95e0c65..c5e6c4b 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -42,6 +42,7 @@
#include "sysemu/tpm.h"
#include "hw/acpi/tpm.h"
#include "sysemu/tpm_backend.h"
+#include "hw/timer/mc146818rtc_regs.h"
/* Supported chipsets: */
#include "hw/acpi/piix4.h"
@@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1 *fadt, AcpiPmInfo *pm)
if (max_cpus > 8) {
fadt->flags |= cpu_to_le32(1 << ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL);
}
+ fadt->century = RTC_CENTURY;
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2015-12-10 17:25 [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table Laszlo Ersek
@ 2015-12-10 18:53 ` Igor Mammedov
2016-01-04 17:19 ` Laszlo Ersek
0 siblings, 1 reply; 7+ messages in thread
From: Igor Mammedov @ 2015-12-10 18:53 UTC (permalink / raw)
To: Laszlo Ersek
Cc: Ruiyu Ni, Eduardo Habkost, Michael S. Tsirkin, qemu-devel,
Paolo Bonzini, Richard Henderson
On Thu, 10 Dec 2015 18:25:34 +0100
Laszlo Ersek <lersek@redhat.com> wrote:
> The ACPI specification (minimally versions 1.0b through 6.0) define
> the FADT.CENTURY field as:
>
> The RTC CMOS RAM index to the century of data value (hundred and
> thousand year decimals). If this field contains a zero, then the RTC
> centenary feature is not supported. If this field has a non-zero
> value, then this field contains an index into RTC RAM space that OSPM
> can use to program the centenary field.
>
> The x86 targets generate ACPI payload, emulate an RTC
> (CONFIG_MC146818RTC), and that RTC supports the "centenary
> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
>
> However, FADT.CENTURY is left at zero currently:
>
> [06Ch 0108 1] RTC Century Index : 00
>
> which -- according to analysis done by Ruiyu Ni at Intel -- should
> cause Linux and Windows 8+ to think the RTC centenary feature is
> unavailable, and cause Windows 7 to (incorrectly) assume that the
> offset to use is constant 0x32. (0x32 happens to be the right value
> on QEMU, but Windows 7 is wrong to assume anything at all).
>
> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
> Windows 8+ about the right capabilities of the hardware, plus it
> retrofits our FADT to Windows 7's behavior.
>
> Regression tested with the following guests (all UEFI installs):
> - i386 Q35: Fedora 21 ("Fedlet" edition)
> - x86_64:
> - i440fx:
> - Fedora 21
> - RHEL 6 and 7
> - Windows 7 and 10
> - Windows Server 2008 R2 and 2012 R2
> - Q35:
> - Fedora 22
> - Windows 8.1
>
> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> ---
> hw/i386/acpi-build.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 95e0c65..c5e6c4b 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -42,6 +42,7 @@
> #include "sysemu/tpm.h"
> #include "hw/acpi/tpm.h"
> #include "sysemu/tpm_backend.h"
> +#include "hw/timer/mc146818rtc_regs.h"
>
> /* Supported chipsets: */
> #include "hw/acpi/piix4.h"
> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
> fadt->flags |= cpu_to_le32(1 <<
> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
> + fadt->century = RTC_CENTURY;
> }
>
>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2015-12-10 18:53 ` Igor Mammedov
@ 2016-01-04 17:19 ` Laszlo Ersek
2016-01-07 10:07 ` Paolo Bonzini
0 siblings, 1 reply; 7+ messages in thread
From: Laszlo Ersek @ 2016-01-04 17:19 UTC (permalink / raw)
To: Igor Mammedov, Eduardo Habkost, Michael S. Tsirkin, Paolo Bonzini
Cc: Ruiyu Ni, qemu-devel, Richard Henderson
On 12/10/15 19:53, Igor Mammedov wrote:
> On Thu, 10 Dec 2015 18:25:34 +0100
> Laszlo Ersek <lersek@redhat.com> wrote:
>
>> The ACPI specification (minimally versions 1.0b through 6.0) define
>> the FADT.CENTURY field as:
>>
>> The RTC CMOS RAM index to the century of data value (hundred and
>> thousand year decimals). If this field contains a zero, then the RTC
>> centenary feature is not supported. If this field has a non-zero
>> value, then this field contains an index into RTC RAM space that OSPM
>> can use to program the centenary field.
>>
>> The x86 targets generate ACPI payload, emulate an RTC
>> (CONFIG_MC146818RTC), and that RTC supports the "centenary
>> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
>> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
>>
>> However, FADT.CENTURY is left at zero currently:
>>
>> [06Ch 0108 1] RTC Century Index : 00
>>
>> which -- according to analysis done by Ruiyu Ni at Intel -- should
>> cause Linux and Windows 8+ to think the RTC centenary feature is
>> unavailable, and cause Windows 7 to (incorrectly) assume that the
>> offset to use is constant 0x32. (0x32 happens to be the right value
>> on QEMU, but Windows 7 is wrong to assume anything at all).
>>
>> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
>> Windows 8+ about the right capabilities of the hardware, plus it
>> retrofits our FADT to Windows 7's behavior.
>>
>> Regression tested with the following guests (all UEFI installs):
>> - i386 Q35: Fedora 21 ("Fedlet" edition)
>> - x86_64:
>> - i440fx:
>> - Fedora 21
>> - RHEL 6 and 7
>> - Windows 7 and 10
>> - Windows Server 2008 R2 and 2012 R2
>> - Q35:
>> - Fedora 22
>> - Windows 8.1
>>
>> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
>> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
>> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
>> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
>> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
>> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>> ---
>> hw/i386/acpi-build.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>> index 95e0c65..c5e6c4b 100644
>> --- a/hw/i386/acpi-build.c
>> +++ b/hw/i386/acpi-build.c
>> @@ -42,6 +42,7 @@
>> #include "sysemu/tpm.h"
>> #include "hw/acpi/tpm.h"
>> #include "sysemu/tpm_backend.h"
>> +#include "hw/timer/mc146818rtc_regs.h"
>>
>> /* Supported chipsets: */
>> #include "hw/acpi/piix4.h"
>> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
>> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
>> fadt->flags |= cpu_to_le32(1 <<
>> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
>> + fadt->century = RTC_CENTURY;
>> }
>>
>>
>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>
Thanks.
Can someone please pick up this patch?
Thanks
Laszlo
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2016-01-04 17:19 ` Laszlo Ersek
@ 2016-01-07 10:07 ` Paolo Bonzini
2016-01-07 11:22 ` Michael S. Tsirkin
0 siblings, 1 reply; 7+ messages in thread
From: Paolo Bonzini @ 2016-01-07 10:07 UTC (permalink / raw)
To: Laszlo Ersek, Igor Mammedov, Eduardo Habkost, Michael S. Tsirkin
Cc: Ruiyu Ni, qemu-devel, Richard Henderson
On 04/01/2016 18:19, Laszlo Ersek wrote:
> On 12/10/15 19:53, Igor Mammedov wrote:
>> On Thu, 10 Dec 2015 18:25:34 +0100
>> Laszlo Ersek <lersek@redhat.com> wrote:
>>
>>> The ACPI specification (minimally versions 1.0b through 6.0) define
>>> the FADT.CENTURY field as:
>>>
>>> The RTC CMOS RAM index to the century of data value (hundred and
>>> thousand year decimals). If this field contains a zero, then the RTC
>>> centenary feature is not supported. If this field has a non-zero
>>> value, then this field contains an index into RTC RAM space that OSPM
>>> can use to program the centenary field.
>>>
>>> The x86 targets generate ACPI payload, emulate an RTC
>>> (CONFIG_MC146818RTC), and that RTC supports the "centenary
>>> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
>>> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
>>>
>>> However, FADT.CENTURY is left at zero currently:
>>>
>>> [06Ch 0108 1] RTC Century Index : 00
>>>
>>> which -- according to analysis done by Ruiyu Ni at Intel -- should
>>> cause Linux and Windows 8+ to think the RTC centenary feature is
>>> unavailable, and cause Windows 7 to (incorrectly) assume that the
>>> offset to use is constant 0x32. (0x32 happens to be the right value
>>> on QEMU, but Windows 7 is wrong to assume anything at all).
>>>
>>> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
>>> Windows 8+ about the right capabilities of the hardware, plus it
>>> retrofits our FADT to Windows 7's behavior.
>>>
>>> Regression tested with the following guests (all UEFI installs):
>>> - i386 Q35: Fedora 21 ("Fedlet" edition)
>>> - x86_64:
>>> - i440fx:
>>> - Fedora 21
>>> - RHEL 6 and 7
>>> - Windows 7 and 10
>>> - Windows Server 2008 R2 and 2012 R2
>>> - Q35:
>>> - Fedora 22
>>> - Windows 8.1
>>>
>>> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
>>> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
>>> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
>>> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
>>> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
>>> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
>>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>>> ---
>>> hw/i386/acpi-build.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>>> index 95e0c65..c5e6c4b 100644
>>> --- a/hw/i386/acpi-build.c
>>> +++ b/hw/i386/acpi-build.c
>>> @@ -42,6 +42,7 @@
>>> #include "sysemu/tpm.h"
>>> #include "hw/acpi/tpm.h"
>>> #include "sysemu/tpm_backend.h"
>>> +#include "hw/timer/mc146818rtc_regs.h"
>>>
>>> /* Supported chipsets: */
>>> #include "hw/acpi/piix4.h"
>>> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
>>> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
>>> fadt->flags |= cpu_to_le32(1 <<
>>> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
>>> + fadt->century = RTC_CENTURY;
>>> }
>>>
>>>
>>
>> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>>
>
> Thanks.
>
> Can someone please pick up this patch?
It should probably go in through Michael's tree, but I've queued it too
so that it isn't forgotten.
Paolo
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2016-01-07 10:07 ` Paolo Bonzini
@ 2016-01-07 11:22 ` Michael S. Tsirkin
2016-01-07 11:24 ` Paolo Bonzini
0 siblings, 1 reply; 7+ messages in thread
From: Michael S. Tsirkin @ 2016-01-07 11:22 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Ruiyu Ni, Eduardo Habkost, qemu-devel, Igor Mammedov,
Laszlo Ersek, Richard Henderson
On Thu, Jan 07, 2016 at 11:07:46AM +0100, Paolo Bonzini wrote:
>
>
> On 04/01/2016 18:19, Laszlo Ersek wrote:
> > On 12/10/15 19:53, Igor Mammedov wrote:
> >> On Thu, 10 Dec 2015 18:25:34 +0100
> >> Laszlo Ersek <lersek@redhat.com> wrote:
> >>
> >>> The ACPI specification (minimally versions 1.0b through 6.0) define
> >>> the FADT.CENTURY field as:
> >>>
> >>> The RTC CMOS RAM index to the century of data value (hundred and
> >>> thousand year decimals). If this field contains a zero, then the RTC
> >>> centenary feature is not supported. If this field has a non-zero
> >>> value, then this field contains an index into RTC RAM space that OSPM
> >>> can use to program the centenary field.
> >>>
> >>> The x86 targets generate ACPI payload, emulate an RTC
> >>> (CONFIG_MC146818RTC), and that RTC supports the "centenary
> >>> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
> >>> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
> >>>
> >>> However, FADT.CENTURY is left at zero currently:
> >>>
> >>> [06Ch 0108 1] RTC Century Index : 00
> >>>
> >>> which -- according to analysis done by Ruiyu Ni at Intel -- should
> >>> cause Linux and Windows 8+ to think the RTC centenary feature is
> >>> unavailable, and cause Windows 7 to (incorrectly) assume that the
> >>> offset to use is constant 0x32. (0x32 happens to be the right value
> >>> on QEMU, but Windows 7 is wrong to assume anything at all).
> >>>
> >>> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
> >>> Windows 8+ about the right capabilities of the hardware, plus it
> >>> retrofits our FADT to Windows 7's behavior.
> >>>
> >>> Regression tested with the following guests (all UEFI installs):
> >>> - i386 Q35: Fedora 21 ("Fedlet" edition)
> >>> - x86_64:
> >>> - i440fx:
> >>> - Fedora 21
> >>> - RHEL 6 and 7
> >>> - Windows 7 and 10
> >>> - Windows Server 2008 R2 and 2012 R2
> >>> - Q35:
> >>> - Fedora 22
> >>> - Windows 8.1
> >>>
> >>> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
> >>> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
> >>> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
> >>> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
> >>> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
> >>> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> >>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> >>> ---
> >>> hw/i386/acpi-build.c | 2 ++
> >>> 1 file changed, 2 insertions(+)
> >>>
> >>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> >>> index 95e0c65..c5e6c4b 100644
> >>> --- a/hw/i386/acpi-build.c
> >>> +++ b/hw/i386/acpi-build.c
> >>> @@ -42,6 +42,7 @@
> >>> #include "sysemu/tpm.h"
> >>> #include "hw/acpi/tpm.h"
> >>> #include "sysemu/tpm_backend.h"
> >>> +#include "hw/timer/mc146818rtc_regs.h"
> >>>
> >>> /* Supported chipsets: */
> >>> #include "hw/acpi/piix4.h"
> >>> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
> >>> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
> >>> fadt->flags |= cpu_to_le32(1 <<
> >>> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
> >>> + fadt->century = RTC_CENTURY;
> >>> }
> >>>
> >>>
> >>
> >> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> >>
> >
> > Thanks.
> >
> > Can someone please pick up this patch?
>
> It should probably go in through Michael's tree, but I've queued it too
> so that it isn't forgotten.
>
> Paolo
Yes - thanks!
I picked this up - should I add your Reviewed-by tag?
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2016-01-07 11:22 ` Michael S. Tsirkin
@ 2016-01-07 11:24 ` Paolo Bonzini
2016-01-07 17:03 ` Laszlo Ersek
0 siblings, 1 reply; 7+ messages in thread
From: Paolo Bonzini @ 2016-01-07 11:24 UTC (permalink / raw)
To: Michael S. Tsirkin
Cc: Ruiyu Ni, Eduardo Habkost, qemu-devel, Igor Mammedov,
Laszlo Ersek, Richard Henderson
On 07/01/2016 12:22, Michael S. Tsirkin wrote:
> On Thu, Jan 07, 2016 at 11:07:46AM +0100, Paolo Bonzini wrote:
>>
>>
>> On 04/01/2016 18:19, Laszlo Ersek wrote:
>>> On 12/10/15 19:53, Igor Mammedov wrote:
>>>> On Thu, 10 Dec 2015 18:25:34 +0100
>>>> Laszlo Ersek <lersek@redhat.com> wrote:
>>>>
>>>>> The ACPI specification (minimally versions 1.0b through 6.0) define
>>>>> the FADT.CENTURY field as:
>>>>>
>>>>> The RTC CMOS RAM index to the century of data value (hundred and
>>>>> thousand year decimals). If this field contains a zero, then the RTC
>>>>> centenary feature is not supported. If this field has a non-zero
>>>>> value, then this field contains an index into RTC RAM space that OSPM
>>>>> can use to program the centenary field.
>>>>>
>>>>> The x86 targets generate ACPI payload, emulate an RTC
>>>>> (CONFIG_MC146818RTC), and that RTC supports the "centenary
>>>>> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
>>>>> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
>>>>>
>>>>> However, FADT.CENTURY is left at zero currently:
>>>>>
>>>>> [06Ch 0108 1] RTC Century Index : 00
>>>>>
>>>>> which -- according to analysis done by Ruiyu Ni at Intel -- should
>>>>> cause Linux and Windows 8+ to think the RTC centenary feature is
>>>>> unavailable, and cause Windows 7 to (incorrectly) assume that the
>>>>> offset to use is constant 0x32. (0x32 happens to be the right value
>>>>> on QEMU, but Windows 7 is wrong to assume anything at all).
>>>>>
>>>>> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
>>>>> Windows 8+ about the right capabilities of the hardware, plus it
>>>>> retrofits our FADT to Windows 7's behavior.
>>>>>
>>>>> Regression tested with the following guests (all UEFI installs):
>>>>> - i386 Q35: Fedora 21 ("Fedlet" edition)
>>>>> - x86_64:
>>>>> - i440fx:
>>>>> - Fedora 21
>>>>> - RHEL 6 and 7
>>>>> - Windows 7 and 10
>>>>> - Windows Server 2008 R2 and 2012 R2
>>>>> - Q35:
>>>>> - Fedora 22
>>>>> - Windows 8.1
>>>>>
>>>>> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
>>>>> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
>>>>> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
>>>>> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
>>>>> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
>>>>> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
>>>>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>>>>> ---
>>>>> hw/i386/acpi-build.c | 2 ++
>>>>> 1 file changed, 2 insertions(+)
>>>>>
>>>>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>>>>> index 95e0c65..c5e6c4b 100644
>>>>> --- a/hw/i386/acpi-build.c
>>>>> +++ b/hw/i386/acpi-build.c
>>>>> @@ -42,6 +42,7 @@
>>>>> #include "sysemu/tpm.h"
>>>>> #include "hw/acpi/tpm.h"
>>>>> #include "sysemu/tpm_backend.h"
>>>>> +#include "hw/timer/mc146818rtc_regs.h"
>>>>>
>>>>> /* Supported chipsets: */
>>>>> #include "hw/acpi/piix4.h"
>>>>> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
>>>>> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
>>>>> fadt->flags |= cpu_to_le32(1 <<
>>>>> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
>>>>> + fadt->century = RTC_CENTURY;
>>>>> }
>>>>>
>>>>>
>>>>
>>>> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>>>>
>>>
>>> Thanks.
>>>
>>> Can someone please pick up this patch?
>>
>> It should probably go in through Michael's tree, but I've queued it too
>> so that it isn't forgotten.
>>
>> Paolo
>
> Yes - thanks!
> I picked this up - should I add your Reviewed-by tag?
Sure!
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table
2016-01-07 11:24 ` Paolo Bonzini
@ 2016-01-07 17:03 ` Laszlo Ersek
0 siblings, 0 replies; 7+ messages in thread
From: Laszlo Ersek @ 2016-01-07 17:03 UTC (permalink / raw)
To: Paolo Bonzini, Michael S. Tsirkin
Cc: Ruiyu Ni, Igor Mammedov, Richard Henderson, Eduardo Habkost, qemu-devel
On 01/07/16 12:24, Paolo Bonzini wrote:
>
>
> On 07/01/2016 12:22, Michael S. Tsirkin wrote:
>> On Thu, Jan 07, 2016 at 11:07:46AM +0100, Paolo Bonzini wrote:
>>>
>>>
>>> On 04/01/2016 18:19, Laszlo Ersek wrote:
>>>> On 12/10/15 19:53, Igor Mammedov wrote:
>>>>> On Thu, 10 Dec 2015 18:25:34 +0100
>>>>> Laszlo Ersek <lersek@redhat.com> wrote:
>>>>>
>>>>>> The ACPI specification (minimally versions 1.0b through 6.0) define
>>>>>> the FADT.CENTURY field as:
>>>>>>
>>>>>> The RTC CMOS RAM index to the century of data value (hundred and
>>>>>> thousand year decimals). If this field contains a zero, then the RTC
>>>>>> centenary feature is not supported. If this field has a non-zero
>>>>>> value, then this field contains an index into RTC RAM space that OSPM
>>>>>> can use to program the centenary field.
>>>>>>
>>>>>> The x86 targets generate ACPI payload, emulate an RTC
>>>>>> (CONFIG_MC146818RTC), and that RTC supports the "centenary
>>>>>> feature" (see occurrences of RTC_CENTURY in cmos_ioport_write() and
>>>>>> cmos_ioport_read() in "hw/timer/mc146818rtc.c".)
>>>>>>
>>>>>> However, FADT.CENTURY is left at zero currently:
>>>>>>
>>>>>> [06Ch 0108 1] RTC Century Index : 00
>>>>>>
>>>>>> which -- according to analysis done by Ruiyu Ni at Intel -- should
>>>>>> cause Linux and Windows 8+ to think the RTC centenary feature is
>>>>>> unavailable, and cause Windows 7 to (incorrectly) assume that the
>>>>>> offset to use is constant 0x32. (0x32 happens to be the right value
>>>>>> on QEMU, but Windows 7 is wrong to assume anything at all).
>>>>>>
>>>>>> Exposing the right nonzero offset in FADT.CENTURY informs Linux and
>>>>>> Windows 8+ about the right capabilities of the hardware, plus it
>>>>>> retrofits our FADT to Windows 7's behavior.
>>>>>>
>>>>>> Regression tested with the following guests (all UEFI installs):
>>>>>> - i386 Q35: Fedora 21 ("Fedlet" edition)
>>>>>> - x86_64:
>>>>>> - i440fx:
>>>>>> - Fedora 21
>>>>>> - RHEL 6 and 7
>>>>>> - Windows 7 and 10
>>>>>> - Windows Server 2008 R2 and 2012 R2
>>>>>> - Q35:
>>>>>> - Fedora 22
>>>>>> - Windows 8.1
>>>>>>
>>>>>> Cc: "Michael S. Tsirkin" <mst@redhat.com> (supporter:ACPI/SMBIOS)
>>>>>> Cc: Igor Mammedov <imammedo@redhat.com> (supporter:ACPI/SMBIOS)
>>>>>> Cc: Paolo Bonzini <pbonzini@redhat.com> (maintainer:X86)
>>>>>> Cc: Richard Henderson <rth@twiddle.net> (maintainer:X86)
>>>>>> Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
>>>>>> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
>>>>>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>>>>>> ---
>>>>>> hw/i386/acpi-build.c | 2 ++
>>>>>> 1 file changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>>>>>> index 95e0c65..c5e6c4b 100644
>>>>>> --- a/hw/i386/acpi-build.c
>>>>>> +++ b/hw/i386/acpi-build.c
>>>>>> @@ -42,6 +42,7 @@
>>>>>> #include "sysemu/tpm.h"
>>>>>> #include "hw/acpi/tpm.h"
>>>>>> #include "sysemu/tpm_backend.h"
>>>>>> +#include "hw/timer/mc146818rtc_regs.h"
>>>>>>
>>>>>> /* Supported chipsets: */
>>>>>> #include "hw/acpi/piix4.h"
>>>>>> @@ -334,6 +335,7 @@ static void fadt_setup(AcpiFadtDescriptorRev1
>>>>>> *fadt, AcpiPmInfo *pm) if (max_cpus > 8) {
>>>>>> fadt->flags |= cpu_to_le32(1 <<
>>>>>> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL); }
>>>>>> + fadt->century = RTC_CENTURY;
>>>>>> }
>>>>>>
>>>>>>
>>>>>
>>>>> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>>>>>
>>>>
>>>> Thanks.
>>>>
>>>> Can someone please pick up this patch?
>>>
>>> It should probably go in through Michael's tree, but I've queued it too
>>> so that it isn't forgotten.
>>>
>>> Paolo
>>
>> Yes - thanks!
>> I picked this up - should I add your Reviewed-by tag?
>
> Sure!
>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
>
> Paolo
>
Thanks guys.
Laszlo
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2016-01-07 17:03 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-12-10 17:25 [Qemu-devel] [PATCH] hw/i386: fill in the CENTURY field of the FADT (FACP) ACPI table Laszlo Ersek
2015-12-10 18:53 ` Igor Mammedov
2016-01-04 17:19 ` Laszlo Ersek
2016-01-07 10:07 ` Paolo Bonzini
2016-01-07 11:22 ` Michael S. Tsirkin
2016-01-07 11:24 ` Paolo Bonzini
2016-01-07 17:03 ` Laszlo Ersek
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