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OvmfPkg/Sec: Enable cache early to speed up booting 

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Currently, the OVMF code relies on the hypervisor to enable the cache
support on the processor in order to improve the boot speed. However,
with SEV-ES, the hypervisor is not allowed to change the CR0 register
to enable caching.

Update the OVMF Sec support to enable caching in order to improve the
boot speed when running as an SEV-ES guest.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Tom Lendacky 2020-08-12 15:21:41 -05:00 committed by mergify[bot]
parent 13e5492bfd
commit e2db781f0c
1 changed files with 7 additions and 0 deletions
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7
OvmfPkg/Sec/SecMain.c
View File

@ -906,6 +906,13 @@ SecCoreStartupWithStack (
// For non SEV-ES guests, just load the IDTR.
//
AsmWriteIdtr (&IdtDescriptor);
} else {
//
// Under SEV-ES, the hypervisor can't modify CR0 and so can't enable
// caching in order to speed up the boot. Enable caching early for
// an SEV-ES guest.
//
AsmEnableCache ();
}
DEBUG ((DEBUG_INFO,