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dm: avoid clear guest memory content if guest is RTVM

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If the guest is RTVM, dm process exit doesn't mean RTVM is
shutdown. Only shutdown_vm in hypervisor guarantee RTVM is
shutodwn. So we should avoid touch guest memory content
from DM if the guest is RTVM.

Tracked-On: #4428
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Yin Fengwei 2020-02-25 17:24:16 +08:00 committed by wenlingz
parent be1e3acb01
commit a63f81097d
1 changed files with 10 additions and 4 deletions
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14
devicemodel/core/vmmapi.c
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@ -330,11 +330,17 @@ vm_unsetup_memory(struct vmctx *ctx)
* allocated the new UOS, the previous UOS sensitive data
* may be leaked to the new UOS if the memory is not cleared.
*
* For rtvm, we can't clean VM's memory as RTVM may still
* run. But we need to return the memory to SOS here.
* Otherwise, VM can't be restart again.
*/
bzero((void *)ctx->baseaddr, ctx->lowmem);
if (ctx->highmem > 0) {
bzero((void *)(ctx->baseaddr + ctx->highmem_gpa_base),
ctx->highmem);
if (!is_rtvm) {
bzero((void *)ctx->baseaddr, ctx->lowmem);
if (ctx->highmem > 0) {
bzero((void *)(ctx->baseaddr + ctx->highmem_gpa_base),
ctx->highmem);
}
}
hugetlb_unsetup_memory(ctx);