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Revert "fix return check for KVM_GET_DIRTY_LOG ioctl" 

This reverts commit b533f658a9.

The original code was wrong, because effectively it ignored errors
from kernel, because kernel does not return -1 on error case but
returns -errno, and does not return -EPERM for this particular ioctl.
But in some cases kernel actually returned unsuccessful result,
namely, when the dirty bitmap in requested slot does not exist
it returns -ENOENT.  With new code this condition becomes an
error when it shouldn't be.

Revert that patch instead of fixing it properly this late in the
release process.  I disagree with this approach, but let's make
things move _somewhere_, instead of arguing endlessly whch of
the 2 proposed fixes is better.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-id: 1397477644-902-1-git-send-email-mjt@msgid.tls.msk.ru
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Michael Tokarev 2014-04-14 16:14:04 +04:00 committed by Peter Maydell
parent c2b9af1d6c
commit 50212d6346
1 changed files with 1 additions and 1 deletions
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kvm-all.c
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@ -441,7 +441,7 @@ static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection *section)
d.slot = mem->slot;
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) < 0) {
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
DPRINTF("ioctl failed %d\n", errno);
ret = -1;
break;