On 02/22/21 08:19, Ankur Arora wrote:
> Advertise OVMF support for CPU hot-unplug and negotiate it
> if QEMU requests the feature.
>
> Cc: Laszlo Ersek
> Cc: Jordan Justen
> Cc: Ard Biesheuvel
> Cc: Igor Mammedov
> Cc: Boris Ostrovsky
> Cc: Aaron Young
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora
> ---
>
> Notes:
> Addresses the following review comments:
> (1,3) s/hot unplug/hot-unplug/
> (2) Get rid of the reference to the made up ICH9_APM_CNT_CPU_HOT_UNPLUG
> (4,6) Remove the artificial tie in between
> ICH9_LPC_SMI_F_CPU_HOTPLUG, ICH9_LPC_SMI_F_CPU_HOT_UNPLUG.
> (5) Fully spell out "SMI on CPU hot-unplug".
> (7) Emit separate messages on negotiation (or not) of
> ICH9_LPC_SMI_F_CPU_HOT_UNPLUG.
>
> OvmfPkg/SmmControl2Dxe/SmiFeatures.c | 18 +-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> b/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> index c9d875543205..b1d59a559dae 100644
> --- a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> +++ b/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> @@ -29,6 +29,12 @@
> //
> #define ICH9_LPC_SMI_F_CPU_HOTPLUG BIT1
>
> +// The following bit value stands for "enable CPU hot-unplug, and inject an
> SMI
> +// with control value ICH9_APM_CNT_CPU_HOTPLUG upon hot-unplug", in the
> +// "etc/smi/supported-features" and "etc/smi/requested-features" fw_cfg
> files.
> +//
> +#define ICH9_LPC_SMI_F_CPU_HOT_UNPLUG BIT2
> +
(1) The comment formatting is inconsistent with the rest. The line right
after the (extant) "ICH9_LPC_SMI_F_CPU_HOTPLUG" macro definition should
be "//", and not an empty line.
In fact, this new hunk should not introduce any empty line.
> //
> // Provides a scratch buffer (allocated in EfiReservedMemoryType type memory)
> // for the S3 boot script fragment to write to and read from.
> @@ -112,7 +118,8 @@ NegotiateSmiFeatures (
>QemuFwCfgReadBytes (sizeof mSmiFeatures, &mSmiFeatures);
>
>//
> - // We want broadcast SMI, SMI on CPU hotplug, and nothing else.
> + // We want broadcast SMI, SMI on CPU hotplug, SMI on CPU hot-unplug
> + // and nothing else.
>//
>RequestedFeaturesMask = ICH9_LPC_SMI_F_BROADCAST;
>if (!MemEncryptSevIsEnabled ()) {
> @@ -120,8 +127,10 @@ NegotiateSmiFeatures (
> // For now, we only support hotplug with SEV disabled.
> //
> RequestedFeaturesMask |= ICH9_LPC_SMI_F_CPU_HOTPLUG;
> +RequestedFeaturesMask |= ICH9_LPC_SMI_F_CPU_HOT_UNPLUG;
>}
>mSmiFeatures &= RequestedFeaturesMask;
> +
(2) Spurious empty line addition (it's likely left over from removing
the earlier attempt to "be smarter than QEMU").
The rest seems fine.
Thanks!
Laszlo
>QemuFwCfgSelectItem (mRequestedFeaturesItem);
>QemuFwCfgWriteBytes (sizeof mSmiFeatures, &mSmiFeatures);
>
> @@ -166,6 +175,13 @@ NegotiateSmiFeatures (
>__FUNCTION__));
>}
>
> + if ((mSmiFeatures & ICH9_LPC_SMI_F_CPU_HOT_UNPLUG) == 0) {
> +DEBUG ((DEBUG_INFO, "%a: CPU hot-unplug not negotiated\n",
> __FUNCTION__));
> + } else {
> +DEBUG ((DEBUG_INFO, "%a: CPU hot-unplug with SMI negotiated\n",
> + __FUNCTION__));
> + }
> +
>//
>// Negotiation successful (although we may not have gotten the optimal
>// feature set).
>
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