[PATCH v5 23/37] KVM: arm64: Define helper for EL2 registers with custom visibility

Marc Zyngier
2024-10-23T14:53:56Z

From: Mark Brown <broonie@kernel.org>

In preparation for adding more visibility filtering for EL2 registers add
a helper macro like EL2_REG() which allows specification of a custom
visibility operation.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240822-kvm-arm64-hide-pie-regs-v2-1-376624fa829c@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/sys_regs.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index dfbfae40c53c5..cfb1e58a31c06 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2164,6 +2164,15 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu,
.val = v, \
}

+#define EL2_REG_FILTERED(name, acc, rst, v, filter) { \
+ SYS_DESC(SYS_##name), \
+ .access = acc, \
+ .reset = rst, \
+ .reg = name, \
+ .visibility = filter, \
+ .val = v, \
+}
+
#define EL2_REG_VNCR(name, rst, v) EL2_REG(name, bad_vncr_trap, rst, v)
#define EL2_REG_REDIR(name, rst, v) EL2_REG(name, bad_redir_trap, rst, v)

@@ -2854,8 +2863,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG_VNCR(HFGITR_EL2, reset_val, 0),
EL2_REG_VNCR(HACR_EL2, reset_val, 0),

- { SYS_DESC(SYS_ZCR_EL2), .access = access_zcr_el2, .reset = reset_val,
- .visibility = sve_el2_visibility, .reg = ZCR_EL2 },
+ EL2_REG_FILTERED(ZCR_EL2, access_zcr_el2, reset_val, 0,
+ sve_el2_visibility),

EL2_REG_VNCR(HCRX_EL2, reset_val, 0),

--
2.39.2