Commit 936a4ec2 authored by Ryan Roberts's avatar Ryan Roberts Committed by Marc Zyngier
Browse files

arm64/mm: Add lpa2_is_enabled() kvm_lpa2_is_enabled() stubs 



Add stub functions which is initially always return false. These provide
the hooks that we need to update the range-based TLBI routines, whose
operands are encoded differently depending on whether lpa2 is enabled or
not.

The kernel and kvm will enable the use of lpa2 asynchronously in future,
and part of that enablement will involve fleshing out their respective
hook to advertise when it is using lpa2.

Since the kernel's decision to use lpa2 relies on more than just whether
the HW supports the feature, it can't just use the same static key as
kvm. This is another reason to use separate functions. lpa2_is_enabled()
is already implemented as part of Ard's kernel lpa2 series. Since kvm
will make its decision solely based on HW support, kvm_lpa2_is_enabled()
will be defined as system_supports_lpa2() once kvm starts using lpa2.

Reviewed-by: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarRyan Roberts <ryan.roberts@arm.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-3-ryan.roberts@arm.com
parent e2768b79

arch/arm64/include/asm/kvm_pgtable.h

+2 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#define KVM_PGTABLE_MIN_BLOCK_LEVEL	2U

#endif



#define kvm_lpa2_is_enabled()		false



static inline u64 kvm_get_parange(u64 mmfr0)

{

	u64 parange = cpuid_feature_extract_unsigned_field(mmfr0,

arch/arm64/include/asm/pgtable-prot.h

+2 −0
Original line number Diff line number Diff line
@@ -71,6 +71,8 @@ extern bool arm64_use_ng_mappings; 
#define PTE_MAYBE_NG		(arm64_use_ng_mappings ? PTE_NG : 0)

#define PMD_MAYBE_NG		(arm64_use_ng_mappings ? PMD_SECT_NG : 0)



#define lpa2_is_enabled()	false



/*

 * If we have userspace only BTI we don't want to mark kernel pages

 * guarded even if the system does support BTI.