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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: CamATXSXvZEgOM8DmqS2y1XFx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1595863904; bh=Tt2+5o38lOQ1i5GNHA/zAACNXslPrpscWN7FE0bSqf4=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=ggJBEccMkiGor2XhHp1hAwMG2eW67pXs9rkUl2sTcwSs4p+ffKshxxiaiFEg2qeHWBW e/woBhsgb2n+ANHTYERX1Qjs1ocb4LMBdE0ddl3k7nuxuxmvWzBfpfg29PUX7TqlsGOj8 RYBMm7+fpDChxfdtIEYGXCJjotllSHWD5BM= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" From: Tom Lendacky BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 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 Cc: Laszlo Ersek Cc: Ard Biesheuvel Reviewed-by: Laszlo Ersek Signed-off-by: Tom Lendacky --- OvmfPkg/Sec/SecMain.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/OvmfPkg/Sec/SecMain.c b/OvmfPkg/Sec/SecMain.c index c2a35463dce4..271a06348ed8 100644 --- a/OvmfPkg/Sec/SecMain.c +++ b/OvmfPkg/Sec/SecMain.c @@ -905,6 +905,13 @@ 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 (); } =20 DEBUG ((DEBUG_INFO, --=20 2.27.0 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#63342): https://edk2.groups.io/g/devel/message/63342 Mute This Topic: https://groups.io/mt/75825076/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-