| Message ID | 20221212095523.52683-14-julien@xen.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | xen/arm: Don't switch TTBR while the MMU is on | expand |
On Mon, 12 Dec 2022, Julien Grall wrote: > From: Julien Grall <jgrall@amazon.com> > > At the moment, xen_pt_update() will only work on the runtime page tables. > In follow-up patches, we will also want to use the helper to update > the boot page tables. > > All the existing callers of xen_pt_update() expects to modify the > current page-tables. Therefore, we can read the root physical address > directly from TTBR0_EL2. > > Signed-off-by: Julien Grall <jgrall@amazon.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> > --- > > Changes in v2: > - Patch added > --- > xen/arch/arm/mm.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c > index cc11f5c639e6..26d6b70410c5 100644 > --- a/xen/arch/arm/mm.c > +++ b/xen/arch/arm/mm.c > @@ -1114,7 +1114,7 @@ static int xen_pt_update(unsigned long virt, > * > * XXX: Add a check. > */ > - const mfn_t root = virt_to_mfn(THIS_CPU_PGTABLE); > + const mfn_t root = maddr_to_mfn(READ_SYSREG64(TTBR0_EL2)); > > /* > * The hardware was configured to forbid mapping both writeable and > -- > 2.38.1 >
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index cc11f5c639e6..26d6b70410c5 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -1114,7 +1114,7 @@ static int xen_pt_update(unsigned long virt, * * XXX: Add a check. */ - const mfn_t root = virt_to_mfn(THIS_CPU_PGTABLE); + const mfn_t root = maddr_to_mfn(READ_SYSREG64(TTBR0_EL2)); /* * The hardware was configured to forbid mapping both writeable and