| Message ID | 20180104184334.16571-20-marc.zyngier@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Jan 04, 2018 at 06:43:34PM +0000, Marc Zyngier wrote: > Update the documentation to reflect the new tricks we play on the > EL2 mappings... > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> > --- > Documentation/arm64/memory.txt | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt > index 671bc0639262..ea64e20037f6 100644 > --- a/Documentation/arm64/memory.txt > +++ b/Documentation/arm64/memory.txt > @@ -86,9 +86,11 @@ Translation table lookup with 64KB pages: > +-------------------------------------------------> [63] TTBR0/1 > > > -When using KVM without the Virtualization Host Extensions, the hypervisor > -maps kernel pages in EL2 at a fixed offset from the kernel VA. See the > -kern_hyp_va macro for more details. > +When using KVM without the Virtualization Host Extensions, the > +hypervisor maps kernel pages in EL2 at a fixed offset (modulo a random > +offset) from the linear mapping. See the kern_hyp_va macro and > +kvm_update_va_mask function for more details. MMIO devices such as > +GICv2 gets mapped next to the HYP idmap page. > > When using KVM with the Virtualization Host Extensions, no additional > mappings are created, since the host kernel runs directly in EL2. > -- > 2.14.2 >
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index 671bc0639262..ea64e20037f6 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -86,9 +86,11 @@ Translation table lookup with 64KB pages: +-------------------------------------------------> [63] TTBR0/1 -When using KVM without the Virtualization Host Extensions, the hypervisor -maps kernel pages in EL2 at a fixed offset from the kernel VA. See the -kern_hyp_va macro for more details. +When using KVM without the Virtualization Host Extensions, the +hypervisor maps kernel pages in EL2 at a fixed offset (modulo a random +offset) from the linear mapping. See the kern_hyp_va macro and +kvm_update_va_mask function for more details. MMIO devices such as +GICv2 gets mapped next to the HYP idmap page. When using KVM with the Virtualization Host Extensions, no additional mappings are created, since the host kernel runs directly in EL2.
Update the documentation to reflect the new tricks we play on the EL2 mappings... Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- Documentation/arm64/memory.txt | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)