On Wed, Aug 08, 2018 at 02:15:00PM +0100, Marc Zyngier wrote:
> In order to generate Group0 SGIs, let's add some decoding logic to
> access_gic_sgi(), and pass the generating group accordingly.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> arch/arm64/include/asm/sysreg.h | 2 ++
> arch/arm64/kvm/sys_regs.c | 41 +++++++++++++++++++++++++++++++--
> 2 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index 98af0b37fb31..b0d2a52a71a3 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -314,6 +314,8 @@
> #define SYS_ICC_DIR_EL1 sys_reg(3, 0, 12, 11, 1)
> #define SYS_ICC_RPR_EL1 sys_reg(3, 0, 12, 11, 3)
> #define SYS_ICC_SGI1R_EL1 sys_reg(3, 0, 12, 11, 5)
> +#define SYS_ICC_ASGI1R_EL1 sys_reg(3, 0, 12, 11, 6)
> +#define SYS_ICC_SGI0R_EL1 sys_reg(3, 0, 12, 11, 7)
> #define SYS_ICC_IAR1_EL1 sys_reg(3, 0, 12, 12, 0)
> #define SYS_ICC_EOIR1_EL1 sys_reg(3, 0, 12, 12, 1)
> #define SYS_ICC_HPPIR1_EL1 sys_reg(3, 0, 12, 12, 2)
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index a09139b97e81..b09eac49e1ac 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -252,10 +252,43 @@ static bool access_gic_sgi(struct kvm_vcpu *vcpu,
> struct sys_reg_params *p,
> const struct sys_reg_desc *r)
> {
> + int group;
> +
> if (!p->is_write)
> return read_from_write_only(vcpu, p, r);
>
> - vgic_v3_dispatch_sgi(vcpu, p->regval, 1);
> + /*
> + * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates
> + * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group,
> + * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively
> + * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure
> + * group.
> + */
> + if (p->is_aarch32) {
> + switch (p->Op1) {
> + default: /* Keep GCC quiet */
> + case 0: /* ICC_SGI1R */
> + group = 1;
> + break;
> + case 1: /* ICC_ASGI1R */
> + case 2: /* ICC_SGI0R */
> + group = 0;
> + break;
> + }
> + } else {
> + switch (p->Op2) {
> + default: /* Keep GCC quiet */
> + case 5: /* ICC_SGI1R_EL1 */
> + group = 1;
> + break;
> + case 6: /* ICC_ASGI1R_EL1 */
> + case 7: /* ICC_SGI0R_EL1 */
> + group = 0;
> + break;
> + }
> + }
> +
> + vgic_v3_dispatch_sgi(vcpu, p->regval, group);
>
> return true;
> }
> @@ -1312,6 +1345,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
> { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only },
> { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only },
> { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi },
> + { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi },
> + { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi },
> { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only },
> { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only },
> { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only },
> @@ -1744,8 +1779,10 @@ static const struct sys_reg_desc cp15_regs[] = {
> static const struct sys_reg_desc cp15_64_regs[] = {
> { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
> { Op1( 0), CRn( 0), CRm( 9), Op2( 0), access_pmu_evcntr },
> - { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi },
> + { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */
> { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 },
> + { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
> + { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */
> { Op1( 2), CRn( 0), CRm(14), Op2( 0), access_cntp_cval },
> };
>
> --
> 2.18.0
>
Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxx>
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