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KVM: arm64: Advertise FGT2 registers to userspace

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While a guest is able to use the FEAT_FGT2 registers, we're missing
them being exposed to userspace. Add them to the (very long) list.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250714122634.3334816-9-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2025-07-14 13:26:31 +01:00 committed by Oliver Upton
parent 72c62700b2
commit a0aae0a9a7
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/kvm/sys_regs.c
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@ -2592,6 +2592,16 @@ static unsigned int tcr2_el2_visibility(const struct kvm_vcpu *vcpu,
return __el2_visibility(vcpu, rd, tcr2_visibility);
}
static unsigned int fgt2_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
{
if (el2_visibility(vcpu, rd) == 0 &&
kvm_has_feat(vcpu->kvm, ID_AA64MMFR0_EL1, FGT, FGT2))
return 0;
return REG_HIDDEN;
}
static unsigned int fgt_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
{
@ -3341,9 +3351,14 @@ static const struct sys_reg_desc sys_reg_descs[] = {
vncr_el2_visibility),
{ SYS_DESC(SYS_DACR32_EL2), undef_access, reset_unknown, DACR32_EL2 },
EL2_REG_VNCR_FILT(HDFGRTR2_EL2, fgt2_visibility),
EL2_REG_VNCR_FILT(HDFGWTR2_EL2, fgt2_visibility),
EL2_REG_VNCR_FILT(HFGRTR2_EL2, fgt2_visibility),
EL2_REG_VNCR_FILT(HFGWTR2_EL2, fgt2_visibility),
EL2_REG_VNCR_FILT(HDFGRTR_EL2, fgt_visibility),
EL2_REG_VNCR_FILT(HDFGWTR_EL2, fgt_visibility),
EL2_REG_VNCR_FILT(HAFGRTR_EL2, fgt_visibility),
EL2_REG_VNCR_FILT(HFGITR2_EL2, fgt2_visibility),
EL2_REG_REDIR(SPSR_EL2, reset_val, 0),
EL2_REG_REDIR(ELR_EL2, reset_val, 0),
{ SYS_DESC(SYS_SP_EL1), access_sp_el1},