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hw/misc/tz_mpc.c: Honour the BLK_LUT settings in translate

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The final part of the Memory Protection Controller we need to
implement is actually using the BLK_LUT data programmed by the
guest to determine whether to block the transaction or not.

Since this means we now change transaction mappings when
the guest writes to BLK_LUT, we must also call the IOMMU
notifiers at that point.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20180620132032.28865-5-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-06-22 13:28:40 +01:00
parent 57c49a6e87
commit dd29d0687d
2 changed files with 52 additions and 2 deletions
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1
hw/misc/trace-events
View File

@ -90,6 +90,7 @@ tz_mpc_reg_write(uint32_t offset, uint64_t data, unsigned size) "TZ MPC regs wri
tz_mpc_mem_blocked_read(uint64_t addr, unsigned size, bool secure) "TZ MPC blocked read: offset 0x%" PRIx64 " size %u secure %d"
tz_mpc_mem_blocked_write(uint64_t addr, uint64_t data, unsigned size, bool secure) "TZ MPC blocked write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u secure %d"
tz_mpc_translate(uint64_t addr, int flags, const char *idx, const char *res) "TZ MPC translate: addr 0x%" PRIx64 " flags 0x%x iommu_idx %s: %s"
tz_mpc_iommu_notify(uint64_t addr) "TZ MPC iommu: notifying UNMAP/MAP for 0x%" PRIx64
# hw/misc/tz-ppc.c
tz_ppc_reset(void) "TZ PPC: reset"

53
hw/misc/tz-mpc.c
View File

@ -72,6 +72,53 @@ static void tz_mpc_irq_update(TZMPC *s)
qemu_set_irq(s->irq, s->int_stat && s->int_en);
}
static void tz_mpc_iommu_notify(TZMPC *s, uint32_t lutidx,
uint32_t oldlut, uint32_t newlut)
{
/* Called when the LUT word at lutidx has changed from oldlut to newlut;
* must call the IOMMU notifiers for the changed blocks.
*/
IOMMUTLBEntry entry = {
.addr_mask = s->blocksize - 1,
};
hwaddr addr = lutidx * s->blocksize * 32;
int i;
for (i = 0; i < 32; i++, addr += s->blocksize) {
bool block_is_ns;
if (!((oldlut ^ newlut) & (1 << i))) {
continue;
}
/* This changes the mappings for both the S and the NS space,
* so we need to do four notifies: an UNMAP then a MAP for each.
*/
block_is_ns = newlut & (1 << i);
trace_tz_mpc_iommu_notify(addr);
entry.iova = addr;
entry.translated_addr = addr;
entry.perm = IOMMU_NONE;
memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, entry);
memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, entry);
entry.perm = IOMMU_RW;
if (block_is_ns) {
entry.target_as = &s->blocked_io_as;
} else {
entry.target_as = &s->downstream_as;
}
memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, entry);
if (block_is_ns) {
entry.target_as = &s->downstream_as;
} else {
entry.target_as = &s->blocked_io_as;
}
memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, entry);
}
}
static void tz_mpc_autoinc_idx(TZMPC *s, unsigned access_size)
{
/* Auto-increment BLK_IDX if necessary */
@ -237,6 +284,7 @@ static MemTxResult tz_mpc_reg_write(void *opaque, hwaddr addr,
s->blk_idx = value % s->blk_max;
break;
case A_BLK_LUT:
tz_mpc_iommu_notify(s, s->blk_idx, s->blk_lut[s->blk_idx], value);
s->blk_lut[s->blk_idx] = value;
tz_mpc_autoinc_idx(s, size);
break;
@ -383,9 +431,10 @@ static IOMMUTLBEntry tz_mpc_translate(IOMMUMemoryRegion *iommu,
/* Look at the per-block configuration for this address, and
* return a TLB entry directing the transaction at either
* downstream_as or blocked_io_as, as appropriate.
* For the moment, always permit accesses.
* If the LUT cfg_ns bit is 1, only non-secure transactions
* may pass. If the bit is 0, only secure transactions may pass.
*/
ok = true;
ok = tz_mpc_cfg_ns(s, addr) == (iommu_idx == IOMMU_IDX_NS);
trace_tz_mpc_translate(addr, flags,
iommu_idx == IOMMU_IDX_S ? "S" : "NS",