Re: [PATCH v3 31/75] x86/head/64: Install boot GDT

[Joerg Roedel]

On Mon, May 18, 2020 at 10:23:13AM +0200, Borislav Petkov wrote:
> On Tue, Apr 28, 2020 at 05:16:41PM +0200, Joerg Roedel wrote:
> > @@ -480,6 +500,22 @@ SYM_DATA_LOCAL(early_gdt_descr_base,	.quad INIT_PER_CPU_VAR(gdt_page))
> >  SYM_DATA(phys_base, .quad 0x0)
> >  EXPORT_SYMBOL(phys_base)
> >
> > +/* Boot GDT used when kernel addresses are not mapped yet */
> > +SYM_DATA_LOCAL(boot_gdt_descr,		.word boot_gdt_end - boot_gdt)
> > +SYM_DATA_LOCAL(boot_gdt_base,		.quad 0)
> > +SYM_DATA_START(boot_gdt)
> > +	.quad	0
> > +	.quad   0x00cf9a000000ffff	/* __KERNEL32_CS */
> > +	.quad   0x00af9a000000ffff	/* __KERNEL_CS */
> > +	.quad   0x00cf92000000ffff	/* __KERNEL_DS */
> > +	.quad	0			/* __USER32_CS - unused */
> > +	.quad	0			/* __USER_DS   - unused */
> > +	.quad	0			/* __USER_CS   - unused */
> > +	.quad	0			/* unused */
> > +	.quad   0x0080890000000000	/* TSS descriptor */
> > +	.quad   0x0000000000000000	/* TSS continued */
> 
> Any chance you could use macros ala GDT_ENTRY_INIT() for those instead
> of the naked values?

Yeah, seems to work. Updated patch attached.