| Message ID | 1490175555-17827-1-git-send-email-paul.durrant@citrix.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, 22 Mar 2017, Paul Durrant wrote: > This patch adds a command-line option (-xen-domid-restrict) which will > use the new libxendevicemodel API to restrict devicemodel [1] operations > to the specified domid. (Such operations are not applicable to the xenpv > machine type). > > This patch also adds a tracepoint to allow successful enabling of the > restriction to be monitored. > > [1] I.e. operations issued by libxendevicemodel. Operation issued by other > xen libraries (e.g. libxenforeignmemory) are currently still unrestricted > but this will be rectified by subsequent patches. > > Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Applied to my next branch > --- > Cc: Stefano Stabellini <sstabellini@kernel.org> > Cc: Anthony Perard <anthony.perard@citrix.com> > Cc: Paolo Bonzini <pbonzini@redhat.com> > > NOTE: This is already re-based on Juergen Gross's patch "xen: use 5 digit > xen versions" and so should not be applied until after that patch > has been applied. > > v4: > - Added missing quote > > v3: > - Updated usage comment > > v2: > - Log errno in tracepoint > --- > hw/xen/trace-events | 1 + > include/hw/xen/xen.h | 1 + > include/hw/xen/xen_common.h | 20 ++++++++++++++++++++ > qemu-options.hx | 7 +++++++ > vl.c | 8 ++++++++ > xen-hvm.c | 8 ++++++++ > 6 files changed, 45 insertions(+) > > diff --git a/hw/xen/trace-events b/hw/xen/trace-events > index c4fb6f1..5615dce 100644 > --- a/hw/xen/trace-events > +++ b/hw/xen/trace-events > @@ -11,3 +11,4 @@ xen_map_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: % > xen_unmap_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: %#"PRIx64" end: %#"PRIx64 > xen_map_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" > xen_unmap_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" > +xen_domid_restrict(int err) "err: %u" > diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h > index 2b1733b..7efcdaa 100644 > --- a/include/hw/xen/xen.h > +++ b/include/hw/xen/xen.h > @@ -21,6 +21,7 @@ enum xen_mode { > > extern uint32_t xen_domid; > extern enum xen_mode xen_mode; > +extern bool xen_domid_restrict; > > extern bool xen_allowed; > > diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h > index df098c7..4f3bd35 100644 > --- a/include/hw/xen/xen_common.h > +++ b/include/hw/xen/xen_common.h > @@ -152,6 +152,13 @@ static inline int xendevicemodel_set_mem_type( > return xc_hvm_set_mem_type(dmod, domid, mem_type, first_pfn, nr); > } > > +static inline int xendevicemodel_restrict( > + xendevicemodel_handle *dmod, domid_t domid) > +{ > + errno = ENOTTY; > + return -1; > +} > + > #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40900 */ > > #include <xendevicemodel.h> > @@ -206,6 +213,19 @@ static inline int xen_modified_memory(domid_t domid, uint64_t first_pfn, > return xendevicemodel_modified_memory(xen_dmod, domid, first_pfn, nr); > } > > +static inline int xen_restrict(domid_t domid) > +{ > + int rc = xendevicemodel_restrict(xen_dmod, domid); > + > + trace_xen_domid_restrict(errno); > + > + if (errno == ENOTTY) { > + return 0; > + } > + > + return rc; > +} > + > /* Xen 4.2 through 4.6 */ > #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701 > > diff --git a/qemu-options.hx b/qemu-options.hx > index 99af8ed..2043371 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -3354,6 +3354,11 @@ DEF("xen-attach", 0, QEMU_OPTION_xen_attach, > "-xen-attach attach to existing xen domain\n" > " xend will use this when starting QEMU\n", > QEMU_ARCH_ALL) > +DEF("xen-domid-restrict", 0, QEMU_OPTION_xen_domid_restrict, > + "-xen-domid-restrict restrict set of available xen operations\n" > + " to specified domain id. (Does not affect\n" > + " xenpv machine type).\n", > + QEMU_ARCH_ALL) > STEXI > @item -xen-domid @var{id} > @findex -xen-domid > @@ -3366,6 +3371,8 @@ Warning: should not be used when xend is in use (XEN only). > @findex -xen-attach > Attach to existing xen domain. > xend will use this when starting QEMU (XEN only). > +@findex -xen-domid-restrict > +Restrict set of available xen operations to specified domain id (XEN only). > ETEXI > > DEF("no-reboot", 0, QEMU_OPTION_no_reboot, \ > diff --git a/vl.c b/vl.c > index 0b4ed52..f46e070 100644 > --- a/vl.c > +++ b/vl.c > @@ -205,6 +205,7 @@ static NotifierList machine_init_done_notifiers = > bool xen_allowed; > uint32_t xen_domid; > enum xen_mode xen_mode = XEN_EMULATE; > +bool xen_domid_restrict; > > static int has_defaults = 1; > static int default_serial = 1; > @@ -3933,6 +3934,13 @@ int main(int argc, char **argv, char **envp) > } > xen_mode = XEN_ATTACH; > break; > + case QEMU_OPTION_xen_domid_restrict: > + if (!(xen_available())) { > + error_report("Option not supported for this target"); > + exit(1); > + } > + xen_domid_restrict = true; > + break; > case QEMU_OPTION_trace: > g_free(trace_file); > trace_file = trace_opt_parse(optarg); > diff --git a/xen-hvm.c b/xen-hvm.c > index 4b928cf..335e263 100644 > --- a/xen-hvm.c > +++ b/xen-hvm.c > @@ -1226,6 +1226,14 @@ 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; > -- > 2.1.4 >
diff --git a/hw/xen/trace-events b/hw/xen/trace-events index c4fb6f1..5615dce 100644 --- a/hw/xen/trace-events +++ b/hw/xen/trace-events @@ -11,3 +11,4 @@ xen_map_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: % xen_unmap_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: %#"PRIx64" end: %#"PRIx64 xen_map_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" xen_unmap_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" +xen_domid_restrict(int err) "err: %u" diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h index 2b1733b..7efcdaa 100644 --- a/include/hw/xen/xen.h +++ b/include/hw/xen/xen.h @@ -21,6 +21,7 @@ enum xen_mode { extern uint32_t xen_domid; extern enum xen_mode xen_mode; +extern bool xen_domid_restrict; extern bool xen_allowed; diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index df098c7..4f3bd35 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -152,6 +152,13 @@ static inline int xendevicemodel_set_mem_type( return xc_hvm_set_mem_type(dmod, domid, mem_type, first_pfn, nr); } +static inline int xendevicemodel_restrict( + xendevicemodel_handle *dmod, domid_t domid) +{ + errno = ENOTTY; + return -1; +} + #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40900 */ #include <xendevicemodel.h> @@ -206,6 +213,19 @@ static inline int xen_modified_memory(domid_t domid, uint64_t first_pfn, return xendevicemodel_modified_memory(xen_dmod, domid, first_pfn, nr); } +static inline int xen_restrict(domid_t domid) +{ + int rc = xendevicemodel_restrict(xen_dmod, domid); + + trace_xen_domid_restrict(errno); + + if (errno == ENOTTY) { + return 0; + } + + return rc; +} + /* Xen 4.2 through 4.6 */ #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701 diff --git a/qemu-options.hx b/qemu-options.hx index 99af8ed..2043371 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3354,6 +3354,11 @@ DEF("xen-attach", 0, QEMU_OPTION_xen_attach, "-xen-attach attach to existing xen domain\n" " xend will use this when starting QEMU\n", QEMU_ARCH_ALL) +DEF("xen-domid-restrict", 0, QEMU_OPTION_xen_domid_restrict, + "-xen-domid-restrict restrict set of available xen operations\n" + " to specified domain id. (Does not affect\n" + " xenpv machine type).\n", + QEMU_ARCH_ALL) STEXI @item -xen-domid @var{id} @findex -xen-domid @@ -3366,6 +3371,8 @@ Warning: should not be used when xend is in use (XEN only). @findex -xen-attach Attach to existing xen domain. xend will use this when starting QEMU (XEN only). +@findex -xen-domid-restrict +Restrict set of available xen operations to specified domain id (XEN only). ETEXI DEF("no-reboot", 0, QEMU_OPTION_no_reboot, \ diff --git a/vl.c b/vl.c index 0b4ed52..f46e070 100644 --- a/vl.c +++ b/vl.c @@ -205,6 +205,7 @@ static NotifierList machine_init_done_notifiers = bool xen_allowed; uint32_t xen_domid; enum xen_mode xen_mode = XEN_EMULATE; +bool xen_domid_restrict; static int has_defaults = 1; static int default_serial = 1; @@ -3933,6 +3934,13 @@ int main(int argc, char **argv, char **envp) } xen_mode = XEN_ATTACH; break; + case QEMU_OPTION_xen_domid_restrict: + if (!(xen_available())) { + error_report("Option not supported for this target"); + exit(1); + } + xen_domid_restrict = true; + break; case QEMU_OPTION_trace: g_free(trace_file); trace_file = trace_opt_parse(optarg); diff --git a/xen-hvm.c b/xen-hvm.c index 4b928cf..335e263 100644 --- a/xen-hvm.c +++ b/xen-hvm.c @@ -1226,6 +1226,14 @@ 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;
This patch adds a command-line option (-xen-domid-restrict) which will use the new libxendevicemodel API to restrict devicemodel [1] operations to the specified domid. (Such operations are not applicable to the xenpv machine type). This patch also adds a tracepoint to allow successful enabling of the restriction to be monitored. [1] I.e. operations issued by libxendevicemodel. Operation issued by other xen libraries (e.g. libxenforeignmemory) are currently still unrestricted but this will be rectified by subsequent patches. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> --- Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Anthony Perard <anthony.perard@citrix.com> Cc: Paolo Bonzini <pbonzini@redhat.com> NOTE: This is already re-based on Juergen Gross's patch "xen: use 5 digit xen versions" and so should not be applied until after that patch has been applied. v4: - Added missing quote v3: - Updated usage comment v2: - Log errno in tracepoint --- hw/xen/trace-events | 1 + include/hw/xen/xen.h | 1 + include/hw/xen/xen_common.h | 20 ++++++++++++++++++++ qemu-options.hx | 7 +++++++ vl.c | 8 ++++++++ xen-hvm.c | 8 ++++++++ 6 files changed, 45 insertions(+)