[This is http://bugs.debian.org/757927 -- trim stopped working in qemu 2.1]
12.08.2014 18:46, Michael Tokarev wrote: > 12.08.2014 17:35, Roman Mamedov wrote: >> Package: qemu-kvm >> Version: 2.1+dfsg-2~bpo70+2 >> Severity: normal >> >> Hello, >> >> I was able to successfully use the passthrough TRIM support with an IDE >> interface virtual disk in Qemu-KVM version 2.0. >> >> However after upgrading to 2.1 and restarting my VM, TRIM now fails in it >> with >> messages like those quoted below (dmesg from the guest). There are no >> messages >> in dmesg related to that on the host. BTW, I found a system here with an SSD which supports discard, and tried my guests against it -- everything works fine when I use sata/ahci, but it breaks indeed when using the default IDE interface. But applying the oneliner: > It is the same as 2.1+dfsg-1~bpo70+2 but with a one-line patch > added: > > diff --git a/hw/ide/core.c b/hw/ide/core.c > index db191a6..7256592 100644 > --- a/hw/ide/core.c > +++ b/hw/ide/core.c > @@ -688,7 +688,8 @@ void ide_dma_cb(void *opaque, int ret) > sector_num, n, s->dma_cmd); > #endif > > - if (!ide_sect_range_ok(s, sector_num, n)) { > + if ((s->dma_cmd == IDE_DMA_READ || s->dma_cmd == IDE_DMA_WRITE) && > + !ide_sect_range_ok(s, sector_num, n)) { > dma_buf_commit(s); > ide_dma_error(s); > return; fixes the prob for me. So apparently kwolf was right pointing to that commit 58ac3211. I'll upload a new version soon. Thanks, /mjt