Hi,
On 6/17/20 4:23 PM, Stefan Berger wrote:
> Check for irq_num having the value of TPM_IRQ_DISABLED before calling any
> IRQ related functions or allowing the user to try to enable interrupts.
> Explicitly allow the value of TPM_IRQ_DISABLED in irq_num.
>
> Signed-off-by: Stefan Berger <stef...@linux.ibm.com>
> Message-id: 20200616205721.1191408-8-stef...@linux.vnet.ibm.com
Reviewed-by: Eric Auger <eric.au...@redhat.com>
Eric
> ---
> hw/tpm/tpm_tis_common.c | 12 +++++++++++-
> hw/tpm/tpm_tis_isa.c | 6 ++++--
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/hw/tpm/tpm_tis_common.c b/hw/tpm/tpm_tis_common.c
> index 0f42696f1f..13b233309e 100644
> --- a/hw/tpm/tpm_tis_common.c
> +++ b/hw/tpm/tpm_tis_common.c
> @@ -359,7 +359,11 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr
> addr,
> val = s->loc[locty].inte;
> break;
> case TPM_TIS_REG_INT_VECTOR:
> - val = s->irq_num;
> + if (s->irq_num != TPM_IRQ_DISABLED) {
> + val = s->irq_num;
> + } else {
> + val = 0;
> + }
> break;
> case TPM_TIS_REG_INT_STATUS:
> val = s->loc[locty].ints;
> @@ -591,6 +595,9 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
> if (s->active_locty != locty) {
> break;
> }
> + if (s->irq_num == TPM_IRQ_DISABLED) {
> + val &= ~TPM_TIS_INT_ENABLED;
> + }
>
> s->loc[locty].inte &= mask;
> s->loc[locty].inte |= (val & (TPM_TIS_INT_ENABLED |
> @@ -601,6 +608,9 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
> /* hard wired -- ignore */
> break;
> case TPM_TIS_REG_INT_STATUS:
> + if (s->irq_num == TPM_IRQ_DISABLED) {
> + break;
> + }
> /* clearing of interrupt flags */
> if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) &&
> (s->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) {
> diff --git a/hw/tpm/tpm_tis_isa.c b/hw/tpm/tpm_tis_isa.c
> index 27222a9a49..d72f733ead 100644
> --- a/hw/tpm/tpm_tis_isa.c
> +++ b/hw/tpm/tpm_tis_isa.c
> @@ -127,13 +127,15 @@ static void tpm_tis_isa_realizefn(DeviceState *dev,
> Error **errp)
> error_setg(errp, "'tpmdev' property is required");
> return;
> }
> - if (s->irq_num > 15) {
> + if (s->irq_num > 15 && s->irq_num != TPM_IRQ_DISABLED) {
> error_setg(errp, "IRQ %d is outside valid range of 0 to 15",
> s->irq_num);
> return;
> }
>
> - isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
> + if (s->irq_num != TPM_IRQ_DISABLED) {
> + isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
> + }
>
> memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
> TPM_TIS_ADDR_BASE, &s->mmio);
>
