* Ren, Qiaowei <qiaowei....@intel.com> wrote:
> On 2013-07-18, Ingo Molnar wrote:
> >
> > * Qiaowei Ren <qiaowei....@intel.com> wrote:
> >
> >> Current code doesn't use specific interface to access I/O space.
> >> So some potential bugs can be caused. We can fix this by using
> >> specific API.
> >
> > This is still very vague.
> >
> >>
> >> Signed-off-by: Qiaowei Ren <qiaowei....@intel.com>
> >> ---
> >> arch/x86/kernel/tboot.c | 21 ++++++++++++---------
> >> 1 file changed, 12 insertions(+), 9 deletions(-)
> >> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index
> >> 3ff42d2..afe8cf8 100644
> >> --- a/arch/x86/kernel/tboot.c
> >> +++ b/arch/x86/kernel/tboot.c
> >> @@ -466,9 +466,12 @@ struct sinit_mle_data {
> >> u32 vtd_dmars_off;
> >> } __packed;
> >> +#define SINIT_MLE_DATA_VTD_DMAR_OFF 140
> >> +
> >> struct acpi_table_header *tboot_get_dmar_table(struct
> >> acpi_table_header *dmar_tbl) {
> >> - void *heap_base, *heap_ptr, *config;
> >> + void __iomem *heap_base, *heap_ptr, *config;
> >> + u32 dmar_tbl_off;
> >>
> >> if (!tboot_enabled())
> >> return dmar_tbl;
> >> @@ -485,25 +488,25 @@ struct acpi_table_header
> > *tboot_get_dmar_table(struct acpi_table_header *dmar_tb
> >> return NULL;
> >>
> >> /* now map TXT heap */
> >> - heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
> >> - *(u64 *)(config + TXTCR_HEAP_SIZE));
> >> + heap_base = ioremap(readl(config + TXTCR_HEAP_BASE),
> >> + readl(config + TXTCR_HEAP_SIZE));
> >> iounmap(config);
> >> if (!heap_base)
> >> return NULL;
> >>
> >> /* walk heap to SinitMleData */
> >> /* skip BiosData */
> >> - heap_ptr = heap_base + *(u64 *)heap_base;
> >> + heap_ptr = heap_base + readq(heap_base);
> >> /* skip OsMleData */
> >> - heap_ptr += *(u64 *)heap_ptr;
> >> + heap_ptr += readq(heap_ptr);
> >> /* skip OsSinitData */
> >> - heap_ptr += *(u64 *)heap_ptr;
> >> + heap_ptr += readq(heap_ptr);
> >> /* now points to SinitMleDataSize; set to SinitMleData */
> >> heap_ptr += sizeof(u64);
> >> /* get addr of DMAR table */
> >> - dmar_tbl = (struct acpi_table_header *)(heap_ptr +
> >> - ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
> >> - sizeof(u64));
> >> + dmar_tbl_off = readl(heap_ptr + SINIT_MLE_DATA_VTD_DMAR_OFF);
> >> + memcpy_fromio(dmar_tbl, heap_ptr + dmar_tbl_off - sizeof(u64),
> >> + sizeof(struct acpi_table_header));
> >
> > That memcpy (or an equivalent of it) was not in the code before, AFAICS.
> >
> > How can this be an 'interface fix'? It adds in new code...
> >
> Sorry, current code only need to get addr of DMAR table, so memcpy_fromio may
> be removed, even though this will also work.
> So "memcpy_fromio" line will be changed to
> dmar_tbl = (struct acpi_table_header *)(heap_ptr + dmar_tbl_off + -
> sizeof(u64));
> If so, no new interface will be added, and the changelog at the beginning of
> this patch is engouch?
Please resubmit the fixed patch so I can have a fresh look.
Thanks,
Ingo
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