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vbox: support unaligned mmio writes 

Issue #1863
This commit is contained in:
Sebastian Sumpf 2016-02-03 11:59:37 +01:00 committed by Christian Helmuth
parent a640be9a24
commit b2a1129bd9
1 changed files with 6 additions and 11 deletions
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17
repos/ports/src/virtualbox/iommio.cc
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@ -120,20 +120,15 @@ VMMDECL(VBOXSTRICTRC) IOMMMIOWrite(PVM pVM, PVMCPU, RTGCPHYS GCPhys,
*/
if (rc == VERR_IOM_NOT_MMIO_RANGE_OWNER) {
/* implement what we need to - extend by need */
Assert((GCPhys & 3U) == 0);
Assert(cbValue == 1);
Assert(cbValue <= 4);
uint32_t value;
RTGCPHYS aligned = GCPhys & ~0x3U;
rc = guest_memory()->mmio_read(aligned, &value, sizeof(value));
rc = guest_memory()->mmio_read(GCPhys, &value, sizeof(value));
Assert(rc == VINF_SUCCESS);
value &= 0xffffff00;
value |= (u32Value & 0x000000ff);
rc = guest_memory()->mmio_write(GCPhys, value, sizeof(value));
uint32_t offset = GCPhys & 0x3;
memcpy(((char *)&value) + offset, &u32Value, cbValue);
rc = guest_memory()->mmio_write(aligned, value, sizeof(value));
}
Assert(rc != VERR_IOM_NOT_MMIO_RANGE_OWNER);