kernel/linux.git/arch/arm64/include/asm/kvm_nested.h, branch v6.3.2Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v6.3.22023-02-11T10:13:30+00:00KVM: arm64: nv: Filter out unsupported features from ID regs2023-02-11T10:13:30+00:00Marc Zyngiermaz@kernel.org2023-02-09T17:58:19+00:00urn:sha1:9f75b6d447d712b6ed9abc869eedf456fe7f5e9b
As there is a number of features that we either can't support,
or don't want to support right away with NV, let's add some
basic filtering so that we don't advertize silly things to the
EL2 guest.
Whilst we are at it, advertize FEAT_TTL as well as FEAT_GTG, which
the NV implementation will implement.
Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230209175820.1939006-18-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
KVM: arm64: nv: Introduce nested virtualization VCPU feature2023-02-11T09:16:11+00:00Christoffer Dallchristoffer.dall@arm.com2023-02-09T17:58:05+00:00urn:sha1:89b0e7de3451a17f23bc1c39bc40eee1811f1669
Introduce the feature bit and a primitive that checks if the feature is
set behind a static key check based on the cpus_have_const_cap check.
Checking vcpu_has_nv() on systems without nested virt enabled
should have negligible overhead.
We don't yet allow userspace to actually set this feature.
Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230209175820.1939006-4-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>