On 2011-04-27 11:34, Avi Kivity wrote: > On 04/26/2011 04:19 PM, Jan Kiszka wrote: >> I've still plans to consolidate MSI-X mask notifiers and KVM hooks, but >> that can wait until we go upstream. >> >> This version still makes classic MSI usable in irqchip mode, now not >> only for PCI devices (AHCI, HDA) but also for the HPET (with msi=on). >> Moreover, it contains an additional patch to refresh the MSI IRQ routes >> after vmload. >> > > Immediately after migration: > > Program terminated with signal 11, Segmentation fault. > #0 le32_to_cpupu (vector=0, kmm=0x0, dev=<value optimized out>) at > ../bswap.h:178 > 178 return p1[0] | (p1[1] << 8) | (p1[2] << 16) | (p1[3] << 24); > Missing separate debuginfos, use: debuginfo-install > SDL-1.2.14-10.fc14.x86_64 cyrus-sasl-lib-2.1.23-12.fc14.x86_64 > cyrus-sasl-plain-2.1.23-12.fc14.x86_64 db4-4.8.30-2.fc14.x86_64 > glibc-2.13-1.x86_64 gnutls-2.8.6-2.fc14.x86_64 > keyutils-libs-1.2-6.fc12.x86_64 krb5-libs-1.8.2-9.fc14.x86_64 > libX11-1.3.4-4.fc14.x86_64 libXau-1.0.6-1.fc14.x86_64 > libaio-0.3.109-2.fc13.x86_64 libcom_err-1.41.12-6.fc14.x86_64 > libcurl-7.21.0-6.fc14.x86_64 libgcc-4.5.1-4.fc14.x86_64 > libgcrypt-1.4.5-4.fc13.x86_64 libgpg-error-1.9-1.fc14.x86_64 > libidn-1.18-1.fc14.x86_64 libpng-1.2.44-1.fc14.x86_64 > libselinux-2.0.96-6.fc14.1.x86_64 libssh2-1.2.4-1.fc14.x86_64 > libtasn1-2.7-1.fc14.x86_64 libxcb-1.7-1.fc14.x86_64 > ncurses-libs-5.7-9.20100703.fc14.x86_64 nspr-4.8.7-1.fc14.x86_64 > nss-3.12.9-9.fc14.x86_64 nss-softokn-freebl-3.12.9-5.fc14.x86_64 > nss-util-3.12.9-1.fc14.x86_64 openldap-2.4.23-4.fc14.x86_64 > openssl-1.0.0d-1.fc14.x86_64 zlib-1.2.5-2.fc14.x86_64 > (gdb) bt > #0 le32_to_cpupu (vector=0, kmm=0x0, dev=<value optimized out>) at > ../bswap.h:178 > #1 pci_get_long (vector=0, kmm=0x0, dev=<value optimized out>) at > /build/home/tlv/akivity/qemu-kvm/hw/pci.h:326 > #2 kvm_msi_message_from_vector (vector=0, kmm=0x0, dev=<value optimized > out>) at /build/home/tlv/akivity/qemu-kvm/hw/msi.c:120 > #3 0x000000000057d59c in kvm_msi_update (dev=0x23eabb0) at > /build/home/tlv/akivity/qemu-kvm/hw/msi.c:152 > #4 0x000000000041e29b in get_pci_config_device (f=0x2466380, > pv=0x23eac28, size=256) at /build/home/tlv/akivity/qemu-kvm/hw/pci.c:346 > #5 0x000000000049c36c in vmstate_load_state (f=0x2466380, > vmsd=0x5fb880, opaque=0x23eabb0, version_id=2) at savevm.c:1374 > #6 0x000000000049c323 in vmstate_load_state (f=0x2466380, > vmsd=0x6f07c0, opaque=0x23eabb0, version_id=3) at savevm.c:1372 > #7 0x000000000049cf84 in vmstate_load (f=0x2466380) at savevm.c:1450 > #8 qemu_loadvm_state (f=0x2466380) at savevm.c:1817 > #9 0x0000000000493e69 in process_incoming_migration (f=<value optimized > out>) at migration.c:66 > #10 0x0000000000494b97 in tcp_accept_incoming_migration (opaque=<value > optimized out>) at migration-tcp.c:163 > #11 0x00000000004a3fa7 in qemu_iohandler_poll (readfds=0x7fff56dc0430, > writefds=0x7fff56dc03b0, xfds=<value optimized out>, > ret=<value optimized out>) at iohandler.c:120 > #12 0x000000000041944a in main_loop_wait (nonblocking=<value optimized > out>) at /build/home/tlv/akivity/qemu-kvm/vl.c:1336 > #13 0x0000000000433a97 in kvm_main_loop () at > /build/home/tlv/akivity/qemu-kvm/qemu-kvm.c:1588 > #14 0x000000000041a3a6 in main_loop (argc=<value optimized out>, > argv=<value optimized out>, envp=<value optimized out>) > at /build/home/tlv/akivity/qemu-kvm/vl.c:1369 > #15 main (argc=<value optimized out>, argv=<value optimized out>, > envp=<value optimized out>) at /build/home/tlv/akivity/qemu-kvm/vl.c:3257 > > (gdb) fr > #3 0x000000000057d59c in kvm_msi_update (dev=0x23eabb0) at > /build/home/tlv/akivity/qemu-kvm/hw/msi.c:152 > (gdb) p dev.msi_irq_entries > $10 = (struct KVMMsiMessage *) 0x0 > > dev points to the i440fx chipset device. >
Yeah, better use this version of patch 8. Jan ----8<----- Establish a post-load notification for the MSI subsystem so that KVM can refresh its IRQ routing after vmload. Signed-off-by: Jan Kiszka <jan.kis...@siemens.com> --- v3: Fix null-pointer deref after vmload by checking for availability of msi routing entries. hw/msi.c | 13 +++++++++++++ hw/msi.h | 1 + hw/pci.c | 2 ++ 3 files changed, 16 insertions(+), 0 deletions(-) diff --git a/hw/msi.c b/hw/msi.c index 18f683b..725b2b7 100644 --- a/hw/msi.c +++ b/hw/msi.c @@ -453,3 +453,16 @@ unsigned int msi_nr_vectors_allocated(const PCIDevice *dev) uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); return msi_nr_vectors(flags); } + +void msi_post_load(PCIDevice *dev) +{ + uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); + + if (kvm_enabled() && dev->msi_irq_entries) { + kvm_msi_free(dev); + + if (flags & PCI_MSI_FLAGS_ENABLE) { + kvm_msi_update(dev); + } + } +} diff --git a/hw/msi.h b/hw/msi.h index 5766018..6ff0607 100644 --- a/hw/msi.h +++ b/hw/msi.h @@ -32,6 +32,7 @@ void msi_reset(PCIDevice *dev); void msi_notify(PCIDevice *dev, unsigned int vector); void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len); unsigned int msi_nr_vectors_allocated(const PCIDevice *dev); +void msi_post_load(PCIDevice *dev); static inline bool msi_present(const PCIDevice *dev) { diff --git a/hw/pci.c b/hw/pci.c index 82e0300..07ec4f9 100644 --- a/hw/pci.c +++ b/hw/pci.c @@ -34,6 +34,7 @@ #include "device-assignment.h" #include "qemu-objects.h" #include "range.h" +#include "msi.h" //#define DEBUG_PCI #ifdef DEBUG_PCI @@ -342,6 +343,7 @@ static int get_pci_config_device(QEMUFile *f, void *pv, size_t size) memcpy(s->config, config, size); pci_update_mappings(s); + msi_post_load(s); qemu_free(config); return 0; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html