iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: arm64: Allow userspace to change ID_AA64MMFR{0-2}_EL1

Browse Source 
Allow userspace to modify the guest-visible values of these ID
registers. Prevent changes to any of the virtualization features until
KVM picks up support for nested and we have a handle on managing NV
features.

Signed-off-by: Jing Zhang <jingzhangos@google.com>
[oliver: prevent changes to EL2 features for now]
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231003230408.3405722-8-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Jing Zhang 2023-10-03 23:04:03 +00:00 committed by Oliver Upton
parent 56d77aa8bd
commit d5a32b60dc
1 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/arm64/kvm/sys_regs.c
View File

@ -2099,9 +2099,23 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_UNALLOCATED(6,7),
/* CRm=7 */
ID_SANITISED(ID_AA64MMFR0_EL1),
ID_SANITISED(ID_AA64MMFR1_EL1),
ID_SANITISED(ID_AA64MMFR2_EL1),
ID_WRITABLE(ID_AA64MMFR0_EL1, ~(ID_AA64MMFR0_EL1_RES0 |
ID_AA64MMFR0_EL1_TGRAN4_2 |
ID_AA64MMFR0_EL1_TGRAN64_2 |
ID_AA64MMFR0_EL1_TGRAN16_2)),
ID_WRITABLE(ID_AA64MMFR1_EL1, ~(ID_AA64MMFR1_EL1_RES0 |
ID_AA64MMFR1_EL1_HCX |
ID_AA64MMFR1_EL1_XNX |
ID_AA64MMFR1_EL1_TWED |
ID_AA64MMFR1_EL1_XNX |
ID_AA64MMFR1_EL1_VH |
ID_AA64MMFR1_EL1_VMIDBits)),
ID_WRITABLE(ID_AA64MMFR2_EL1, ~(ID_AA64MMFR2_EL1_RES0 |
ID_AA64MMFR2_EL1_EVT |
ID_AA64MMFR2_EL1_FWB |
ID_AA64MMFR2_EL1_IDS |
ID_AA64MMFR2_EL1_NV |
ID_AA64MMFR2_EL1_CCIDX)),
ID_SANITISED(ID_AA64MMFR3_EL1),
ID_UNALLOCATED(7,4),
ID_UNALLOCATED(7,5),