summaryrefslogtreecommitdiffstats
path: root/OvmfPkg/OvmfPkgIa32.dsc
diff options
context:
space:
mode:
authorLaszlo Ersek <lersek@redhat.com>2019-09-20 10:56:47 +0200
committermergify[bot] <37929162+mergify[bot]@users.noreply.github.com>2020-02-05 12:59:32 +0000
commitd74d56fcfa31446a220f1a1145d61d3f36445580 (patch)
treef9704188b2128c1c791ac255bbb67afa406a09da /OvmfPkg/OvmfPkgIa32.dsc
parent422da35375c6d95dae9d5c56530d255b672b1f59 (diff)
downloadedk2-d74d56fcfa31446a220f1a1145d61d3f36445580.tar.gz
edk2-d74d56fcfa31446a220f1a1145d61d3f36445580.tar.bz2
edk2-d74d56fcfa31446a220f1a1145d61d3f36445580.zip
OvmfPkg: introduce PcdQ35SmramAtDefaultSmbase
For supporting VCPU hotplug with SMM enabled/required, QEMU offers the (dynamically detectable) feature called "SMRAM at default SMBASE". When the feature is enabled, the firmware can lock down the 128 KB range starting at the default SMBASE; that is, the [0x3_0000, 0x4_FFFF] interval. The goal is to shield the very first SMI handler of the hotplugged VCPU from OS influence. Multiple modules in OVMF will have to inter-operate for locking down this range. Introduce a dynamic PCD that will reflect the feature (to be negotiated by PlatformPei), for coordination between drivers. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Message-Id: <20200129214412.2361-2-lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'OvmfPkg/OvmfPkgIa32.dsc')
-rw-r--r--OvmfPkg/OvmfPkgIa32.dsc1
1 files changed, 1 insertions, 0 deletions
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 4568b78cad..43ff519336 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -565,6 +565,7 @@
!if $(SMM_REQUIRE) == TRUE
gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8
+ gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase|FALSE
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmSyncMode|0x01
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmApSyncTimeout|100000
!endif