eadbec0109
Accesses to system registers are disproportionately heavy-weight when executed under virtualization, since each one involves two world switches (from guest to host and back again). So change the sequence that enables the GIC SRE interface so that it performs only a single sysreg read to test whether the SRE interface is enabled already, and only performs a write and an additional read if that turns out not to be the case. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17596 6f19259b-4bc3-4df7-8a09-765794883524