KVM: arm64: nv: Handle ZCR_EL2 traps

Browse source

Unlike other SVE-related registers, ZCR_EL2 takes a sysreg trap to EL2
when HCR_EL2.NV = 1. KVM still needs to honor the guest hypervisor's
trap configuration, which expects an SVE trap (i.e. ESR_EL2.EC = 0x19)
when CPTR traps are enabled for the vCPU's current context.

Otherwise, if the guest hypervisor has traps disabled, emulate the
access by mapping the requested VL into ZCR_EL1.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-4-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

This commit is contained in:

Oliver Upton 2024-06-20 16:46:40 +00:00

parent 399debfc97

commit b3d29a8230

3 changed files with 49 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

8

arch/arm64/include/asm/kvm_emulate.h

View file

3

arch/arm64/include/asm/kvm_host.h

View file

38

arch/arm64/kvm/sys_regs.c

View file