[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 04/12] xen: defer call to xen_restrict until just before os_setup_post
We need to restrict *all* the control fds that qemu opens. Looking in /proc/PID/fd shows there are many; their allocation seems scattered throughout Xen support code in qemu. We must postpone the restrict call until roughly the same time as qemu changes its uid, chroots (if applicable), and so on. There doesn't seem to be an appropriate hook already. The RunState change hook fires at different times depending on exactly what mode qemu is operating in. And it appears that no-one but the Xen code wants a hook at this phase of execution. So, introduce a bare call to a new function xen_setup_post, just before os_setup_post. Also provide the appropriate stub for when Xen compilation is disabled. We do the restriction before rather than after os_setup_post, because xen_restrict may need to open /dev/null, and os_setup_post might have called chroot. Currently this does not work with migration, because when running as the Xen device model qemu needs to signal to the toolstack that it is ready. It currently does this using xenstore, and for incoming migration (but not for ordinary startup) that happens after os_setup_post. It is correct that this happens late: we want the incoming migration stream to be processed by a restricted qemu. The fix for this will be to do the startup notification a different way, without using xenstore. (QMP is probably a reasonable choice.) So for now this restriction feature cannot be used in conjunction with migration. (Note that this is not a regression in this patch, because previously the -xen-restrict-domid call was, in fact, simply ineffective!) We will revisit this in the Xen 4.11 release cycle. Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> CC: Paolo Bonzini <pbonzini@xxxxxxxxxx> (maintainer:X86) CC: Richard Henderson <rth@xxxxxxxxxxx> (maintainer:X86) CC: Eduardo Habkost <ehabkost@xxxxxxxxxx> (maintainer:X86) CC: Michael S. Tsirkin <mst@xxxxxxxxxx> (supporter:PC) --- v5: Discuss problems with migration startup notification in the commit message. v3: Do xen_setup_post just before, not just after, os_setup_post, to improve interaction with chroot. Thanks to Ross Lagerwall. Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> --- hw/i386/xen/xen-hvm.c | 8 -------- hw/xen/xen-common.c | 13 +++++++++++++ include/sysemu/sysemu.h | 2 ++ stubs/xen-hvm.c | 5 +++++ vl.c | 1 + 5 files changed, 21 insertions(+), 8 deletions(-) diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c index f24b7d4..9c3b6b3 100644 --- a/hw/i386/xen/xen-hvm.c +++ b/hw/i386/xen/xen-hvm.c @@ -1254,14 +1254,6 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory) goto err; } - if (xen_domid_restrict) { - rc = xen_restrict(xen_domid); - if (rc < 0) { - error_report("failed to restrict: error %d", errno); - goto err; - } - } - xen_create_ioreq_server(xen_domid, &state->ioservid); state->exit.notify = xen_exit_notifier; diff --git a/hw/xen/xen-common.c b/hw/xen/xen-common.c index 83099dd..f73b416 100644 --- a/hw/xen/xen-common.c +++ b/hw/xen/xen-common.c @@ -117,6 +117,19 @@ static void xen_change_state_handler(void *opaque, int running, } } +void xen_setup_post(void) +{ + int rc; + + if (xen_domid_restrict) { + rc = xen_restrict(xen_domid); + if (rc < 0) { + perror("xen: failed to restrict"); + exit(1); + } + } +} + static int xen_init(MachineState *ms) { xen_xc = xc_interface_open(0, 0, 0); diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index d24ad09..6b785a4 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -92,6 +92,8 @@ void qemu_remove_machine_init_done_notifier(Notifier *notify); void qemu_announce_self(void); +void xen_setup_post(void); + extern int autostart; typedef enum { diff --git a/stubs/xen-hvm.c b/stubs/xen-hvm.c index 0067bcc..48ca8da 100644 --- a/stubs/xen-hvm.c +++ b/stubs/xen-hvm.c @@ -13,6 +13,7 @@ #include "hw/xen/xen.h" #include "exec/memory.h" #include "qapi/qapi-commands-misc.h" +#include "sysemu/sysemu.h" int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num) { @@ -61,3 +62,7 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory) void qmp_xen_set_global_dirty_log(bool enable, Error **errp) { } + +void xen_setup_post(void) +{ +} diff --git a/vl.c b/vl.c index dae986b..e6e8e1e 100644 --- a/vl.c +++ b/vl.c @@ -4719,6 +4719,7 @@ int main(int argc, char **argv, char **envp) vm_start(); } + xen_setup_post(); os_setup_post(); main_loop(); -- 2.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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