On Mon, 10 Jul 2023 at 11:07, Borislav Petkov <bp@xxxxxxxxx> wrote: > > On Wed, Jun 07, 2023 at 09:23:28AM +0200, Ard Biesheuvel wrote: > > Instead of pushing and popping %RSI several times to preserve the struct > > boot_params pointer across the execution of the startup code, move it > > into a callee save register before the first call into C, and copy it > > back when needed. > > > > Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx> > > --- > > arch/x86/boot/compressed/head_64.S | 34 +++++++------------- > > 1 file changed, 11 insertions(+), 23 deletions(-) > > I like that. > > We do a similar dance in arch/x86/kernel/head_64.S. Care to fix that > too, in a separate patch? > I already did, actually, but I dropped it from this series because it was getting too long, and not essential for the overall goal of the changes. https://lore.kernel.org/all/20230602101313.3557775-19-ardb@xxxxxxxxxx/
