mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-11-04 02:30:34 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

KVM: arm64: nv: Introduce nested virtualization VCPU feature

Browse source 
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>
This commit is contained in:
Christoffer Dall 2023-02-09 17:58:05 +00:00 committed by Oliver Upton
parent 8531bd63a8
commit 89b0e7de34
2 changed files with 15 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
arch/arm64/include/asm/kvm_nested.h Normal file
View file

@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ARM64_KVM_NESTED_H
#define __ARM64_KVM_NESTED_H
#include <linux/kvm_host.h>
static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
{
return (!__is_defined(__KVM_NVHE_HYPERVISOR__) &&
cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
}
#endif /* __ARM64_KVM_NESTED_H */

1
arch/arm64/include/uapi/asm/kvm.h
View file

@ -109,6 +109,7 @@ struct kvm_regs {
#define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */
#define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */
#define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */
#define KVM_ARM_VCPU_HAS_EL2 7 /* Support nested virtualization */
struct kvm_vcpu_init {
__u32 target;