Advertise OVMF support for CPU hot-unplug and negotiate it if QEMU requests the feature.
Cc: Laszlo Ersek <ler...@redhat.com> Cc: Jordan Justen <jordan.l.jus...@intel.com> Cc: Ard Biesheuvel <ard.biesheu...@arm.com> Cc: Igor Mammedov <imamm...@redhat.com> Cc: Boris Ostrovsky <boris.ostrov...@oracle.com> Cc: Aaron Young <aaron.yo...@oracle.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132 Signed-off-by: Ankur Arora <ankur.a.ar...@oracle.com> --- Notes: Addresses the following comments from v8: (1) Remove inconsistent comment style (and stray newline) around the newly added ICH9_LPC_SMI_F_CPU_HOT_UNPLUG. (2) Remove spurious empty line. OvmfPkg/SmmControl2Dxe/SmiFeatures.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c b/OvmfPkg/SmmControl2Dxe/SmiFeatures.c index c9d875543205..3e2e61e4dbd0 100644 --- a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c +++ b/OvmfPkg/SmmControl2Dxe/SmiFeatures.c @@ -28,7 +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) // for the S3 boot script fragment to write to and read from. @@ -112,7 +117,8 @@ 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 +126,7 @@ 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 +173,13 @@ 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). -- 2.9.3 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#72712): https://edk2.groups.io/g/devel/message/72712 Mute This Topic: https://groups.io/mt/81273612/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
