On Tue, Jun 25, 2024 at 07:28:19PM +0800, Yuke Peng wrote:
> According to Intel VT-d specification 5.1.4, CFI must be blocked when
> Extended Interrupt Mode is enabled or Compatibility format interrupts
> are disabled.
>
> Signed-off-by: Yuke Peng <pykfi...@gmail.com>
> ---
> hw/i386/intel_iommu.c | 28 ++++++++++++++++++++++++++++
> hw/i386/trace-events | 1 +
> include/hw/i386/intel_iommu.h | 1 +
> 3 files changed, 30 insertions(+)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 5085a6fee3..dfa2f979e7 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -2410,6 +2410,22 @@ static void vtd_handle_gcmd_ire(IntelIOMMUState *s,
> bool en)
> }
> }
>
> +/* Handle Compatibility Format Interrupts Enable/Disable */
> +static void vtd_handle_gcmd_cfi(IntelIOMMUState *s, bool en)
> +{
> + trace_vtd_cfi_enable(en);
> +
> + if (en) {
> + s->cfi_enabled = true;
> + /* Ok - report back to driver */
> + vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_CFIS);
> + } else {
> + s->cfi_enabled = false;
> + /* Ok - report back to driver */
> + vtd_set_clear_mask_long(s, DMAR_GSTS_REG, VTD_GSTS_CFIS, 0);
> + }
> +}
> +
> /* Handle write to Global Command Register */
> static void vtd_handle_gcmd_write(IntelIOMMUState *s)
> {
> @@ -2440,6 +2456,10 @@ static void vtd_handle_gcmd_write(IntelIOMMUState *s)
> /* Interrupt remap enable/disable */
> vtd_handle_gcmd_ire(s, val & VTD_GCMD_IRE);
> }
> + if (changed & VTD_GCMD_CFI) {
> + /* Compatibility format interrupts enable/disable */
> + vtd_handle_gcmd_cfi(s, val & VTD_GCMD_CFI);
> + }
> }
>
> /* Handle write to Context Command Register */
> @@ -3304,6 +3324,7 @@ static const VMStateDescription vtd_vmstate = {
> VMSTATE_BOOL(dmar_enabled, IntelIOMMUState),
> VMSTATE_BOOL(qi_enabled, IntelIOMMUState),
> VMSTATE_BOOL(intr_enabled, IntelIOMMUState),
> + VMSTATE_BOOL(cfi_enabled, IntelIOMMUState),
> VMSTATE_BOOL(intr_eime, IntelIOMMUState),
> VMSTATE_END_OF_LIST()
> }
Looks like this will break migration compat.
The normal waywhould be that we use something like
VMSTATE_UINT32_TEST() or subsections for the new vmstate field.
sometimes it's possible to re-generate the field from
the registers, then there's no need to add a new field
to migration at all, instead calculate it in vtd_post_load.
> @@ -3525,6 +3546,12 @@ static int vtd_interrupt_remap_msi(IntelIOMMUState
> *iommu,
>
> /* This is compatible mode. */
> if (addr.addr.int_mode != VTD_IR_INT_FORMAT_REMAP) {
> + if (iommu->intr_eime || !iommu->cfi_enabled) {
> + if (do_fault) {
> + vtd_report_ir_fault(iommu, sid, VTD_FR_IR_REQ_COMPAT, 0);
> + }
> + return -EINVAL;
> + }
> memcpy(translated, origin, sizeof(*origin));
> goto out;
> }
> @@ -3950,6 +3977,7 @@ static void vtd_init(IntelIOMMUState *s)
> s->root_scalable = false;
> s->dmar_enabled = false;
> s->intr_enabled = false;
> + s->cfi_enabled = false;
> s->iq_head = 0;
> s->iq_tail = 0;
> s->iq = 0;
> diff --git a/hw/i386/trace-events b/hw/i386/trace-events
> index 53c02d7ac8..ffd87db65f 100644
> --- a/hw/i386/trace-events
> +++ b/hw/i386/trace-events
> @@ -57,6 +57,7 @@ vtd_dmar_translate(uint8_t bus, uint8_t slot, uint8_t func,
> uint64_t iova, uint6
> vtd_dmar_enable(bool en) "enable %d"
> vtd_dmar_fault(uint16_t sid, int fault, uint64_t addr, bool is_write) "sid
> 0x%"PRIx16" fault %d addr 0x%"PRIx64" write %d"
> vtd_ir_enable(bool en) "enable %d"
> +vtd_cfi_enable(bool en) "enable %d"
> vtd_ir_irte_get(int index, uint64_t lo, uint64_t hi) "index %d low
> 0x%"PRIx64" high 0x%"PRIx64
> vtd_ir_remap(int index, int tri, int vec, int deliver, uint32_t dest, int
> dest_mode) "index %d trigger %d vector %d deliver %d dest 0x%"PRIx32" mode %d"
> vtd_ir_remap_type(const char *type) "%s"
> diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
> index 7fa0a695c8..38e20d0f2c 100644
> --- a/include/hw/i386/intel_iommu.h
> +++ b/include/hw/i386/intel_iommu.h
> @@ -294,6 +294,7 @@ struct IntelIOMMUState {
>
> /* interrupt remapping */
> bool intr_enabled; /* Whether guest enabled IR */
> + bool cfi_enabled; /* Whether CFI is enabled */
> dma_addr_t intr_root; /* Interrupt remapping table pointer */
> uint32_t intr_size; /* Number of IR table entries */
> bool intr_eime; /* Extended interrupt mode enabled */
> --
> 2.34.1
