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KVM: arm64: Add TCR2_EL2 to the sysreg arrays

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Add the TCR2_EL2 register to the per-vcpu sysreg register array,
the sysreg descriptor array, and advertise it as mapped to TCR2_EL1
for NV purposes.

Access to this register is conditional based on ID_AA64MMFR3_EL1.TCRX
being advertised.

Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241023145345.1613824-12-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2024-10-23 15:53:19 +01:00 committed by Oliver Upton
parent 9ae424d2a1
commit 69c19e047d
2 changed files with 15 additions and 0 deletions
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1
arch/arm64/include/asm/kvm_host.h
View File

@ -499,6 +499,7 @@ enum vcpu_sysreg {
/* Anything from this can be RES0/RES1 sanitised */
MARKER(__SANITISED_REG_START__),
TCR2_EL2, /* Extended Translation Control Register (EL2) */
/* Any VNCR-capable reg goes after this point */
MARKER(__VNCR_START__),

14
arch/arm64/kvm/sys_regs.c
View File

@ -134,6 +134,7 @@ static bool get_el2_to_el1_mapping(unsigned int reg,
MAPPED_EL2_SYSREG(ESR_EL2, ESR_EL1, NULL );
MAPPED_EL2_SYSREG(FAR_EL2, FAR_EL1, NULL );
MAPPED_EL2_SYSREG(MAIR_EL2, MAIR_EL1, NULL );
MAPPED_EL2_SYSREG(TCR2_EL2, TCR2_EL1, NULL );
MAPPED_EL2_SYSREG(AMAIR_EL2, AMAIR_EL1, NULL );
MAPPED_EL2_SYSREG(ELR_EL2, ELR_EL1, NULL );
MAPPED_EL2_SYSREG(SPSR_EL2, SPSR_EL1, NULL );
@ -452,6 +453,18 @@ static bool access_vm_reg(struct kvm_vcpu *vcpu,
return true;
}
static bool access_tcr2_el2(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, TCRX, IMP)) {
kvm_inject_undefined(vcpu);
return false;
}
return access_rw(vcpu, p, r);
}
static bool access_actlr(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
@ -2866,6 +2879,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG(TTBR0_EL2, access_rw, reset_val, 0),
EL2_REG(TTBR1_EL2, access_rw, reset_val, 0),
EL2_REG(TCR_EL2, access_rw, reset_val, TCR_EL2_RES1),
EL2_REG(TCR2_EL2, access_tcr2_el2, reset_val, TCR2_EL2_RES1),
EL2_REG_VNCR(VTTBR_EL2, reset_val, 0),
EL2_REG_VNCR(VTCR_EL2, reset_val, 0),