tyler.durden
/
audk
mirror of https://github.com/acidanthera/audk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

OvmfPkg/SmmControl2Dxe: negotiate CPU hot-unplug 

Advertise OVMF support for CPU hot-unplug and negotiate it
if QEMU requests the feature.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Aaron Young <aaron.young@oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Message-Id: <20210312062656.2477515-11-ankur.a.arora@oracle.com>
[lersek@redhat.com: preserve the empty line between the ICH9_LPC_SMI_F_*
 group of macro definitions and the SCRATCH_BUFFER type definition]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Ankur Arora 2021-03-11 22:26:56 -08:00 committed by mergify[bot]
parent f053288863
commit f3bdfc4186
1 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
OvmfPkg/SmmControl2Dxe/SmiFeatures.c
View File

@ -28,6 +28,12 @@
// "etc/smi/supported-features" and "etc/smi/requested-features" fw_cfg files.
//
#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
//
// Provides a scratch buffer (allocated in EfiReservedMemoryType type memory)
@ -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 ()) {
@ -120,6 +127,7 @@ 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;
QemuFwCfgSelectItem (mRequestedFeaturesItem);
@ -166,6 +174,13 @@ 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).