diff options
| author | Marc Zyngier <maz@kernel.org> | 2025-06-03 08:08:22 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-06-05 14:18:01 +0100 |
| commit | 8800b7c4bbede3cd40831726d3f98e8080baf4df (patch) | |
| tree | 7e98e9afc9510602e000928efc11e6994b7af4ad /arch/arm64/include | |
| parent | 6678791ee3da0b78c28fe7d77814097f53cbb8df (diff) | |
KVM: arm64: Add RMW specific sysreg accessor
In a number of cases, we perform a Read-Modify-Write operation on
a system register, meaning that we would apply the RESx masks twice.
Instead, provide a new accessor that performs this RMW operation,
allowing the masks to be applied exactly once per operation.
Reviewed-by: Miguel Luis <miguel.luis@oracle.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250603070824.1192795-3-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 3b84ad91116b..8b8c649f225b 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1118,6 +1118,17 @@ u64 kvm_vcpu_apply_reg_masks(const struct kvm_vcpu *, enum vcpu_sysreg, u64); ctxt_sys_reg(ctxt, (r)) = __v; \ } while (0) +#define __vcpu_rmw_sys_reg(v, r, op, val) \ + do { \ + const struct kvm_cpu_context *ctxt = &(v)->arch.ctxt; \ + u64 __v = ctxt_sys_reg(ctxt, (r)); \ + __v op (val); \ + if (vcpu_has_nv((v)) && (r) >= __SANITISED_REG_START__) \ + __v = kvm_vcpu_apply_reg_masks((v), (r), __v); \ + \ + ctxt_sys_reg(ctxt, (r)) = __v; \ + } while (0) + #define __vcpu_sys_reg(v,r) \ (*({ \ const struct kvm_cpu_context *ctxt = &(v)->arch.ctxt; \ |