| Message ID | 20220318150135.308623-1-eric.auger@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,for-7.1] vfio/common: remove spurious tpm-crb-cmd misalignment warning | expand |
On 18/3/22 16:01, Eric Auger wrote: > The CRB command buffer currently is a RAM MemoryRegion and given > its base address alignment, it causes an error report on > vfio_listener_region_add(). This region could have been a RAM device > region, easing the detection of such safe situation but this option > was not well received. So let's add a helper function that uses the > memory region owner type to detect the situation is safe wrt > the assignment. Other device types can be checked here if such kind > of problem occurs again. > > Signed-off-by: Eric Auger <eric.auger@redhat.com> > > --- > > v1 -> v2: > - do not check the MR name but rather the owner type > --- > hw/vfio/common.c | 27 ++++++++++++++++++++++++++- > hw/vfio/trace-events | 1 + > 2 files changed, 27 insertions(+), 1 deletion(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index 080046e3f51..98b0b6fb8c7 100644 > --- a/hw/vfio/common.c > +++ b/hw/vfio/common.c > @@ -40,6 +40,7 @@ > #include "trace.h" > #include "qapi/error.h" > #include "migration/migration.h" > +#include "sysemu/tpm.h" > +static bool vfio_known_safe_misalignment(MemoryRegionSection *section) > +{ > + MemoryRegion *mr = section->mr; > + > + if (!object_dynamic_cast(mr->owner, TYPE_TPM_CRB)) { Using TPM_IS_CRB() instead: Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Hi, On 3/18/22 5:18 PM, Philippe Mathieu-Daudé wrote: > On 18/3/22 16:01, Eric Auger wrote: >> The CRB command buffer currently is a RAM MemoryRegion and given >> its base address alignment, it causes an error report on >> vfio_listener_region_add(). This region could have been a RAM device >> region, easing the detection of such safe situation but this option >> was not well received. So let's add a helper function that uses the >> memory region owner type to detect the situation is safe wrt >> the assignment. Other device types can be checked here if such kind >> of problem occurs again. >> >> Signed-off-by: Eric Auger <eric.auger@redhat.com> >> >> --- >> >> v1 -> v2: >> - do not check the MR name but rather the owner type >> --- >> hw/vfio/common.c | 27 ++++++++++++++++++++++++++- >> hw/vfio/trace-events | 1 + >> 2 files changed, 27 insertions(+), 1 deletion(-) >> >> diff --git a/hw/vfio/common.c b/hw/vfio/common.c >> index 080046e3f51..98b0b6fb8c7 100644 >> --- a/hw/vfio/common.c >> +++ b/hw/vfio/common.c >> @@ -40,6 +40,7 @@ >> #include "trace.h" >> #include "qapi/error.h" >> #include "migration/migration.h" >> +#include "sysemu/tpm.h" > >> +static bool vfio_known_safe_misalignment(MemoryRegionSection *section) >> +{ >> + MemoryRegion *mr = section->mr; >> + >> + if (!object_dynamic_cast(mr->owner, TYPE_TPM_CRB)) { > > Using TPM_IS_CRB() instead: > Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Hum yes, missed that define. Alex, with that fix, does it match your expectation. Do we really want to add the dynamic trace point for safe misalignments or don't we care? Thanks Eric
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 080046e3f51..98b0b6fb8c7 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -40,6 +40,7 @@ #include "trace.h" #include "qapi/error.h" #include "migration/migration.h" +#include "sysemu/tpm.h" VFIOGroupList vfio_group_list = QLIST_HEAD_INITIALIZER(vfio_group_list); @@ -861,6 +862,22 @@ static void vfio_unregister_ram_discard_listener(VFIOContainer *container, g_free(vrdl); } +static bool vfio_known_safe_misalignment(MemoryRegionSection *section) +{ + MemoryRegion *mr = section->mr; + + if (!object_dynamic_cast(mr->owner, TYPE_TPM_CRB)) { + return false; + } + + /* this is a known safe misaligned region, just trace for debug purpose */ + trace_vfio_known_safe_misalignment(memory_region_name(mr), + section->offset_within_address_space, + section->offset_within_region, + qemu_real_host_page_size); + return true; +} + static void vfio_listener_region_add(MemoryListener *listener, MemoryRegionSection *section) { @@ -884,7 +901,15 @@ static void vfio_listener_region_add(MemoryListener *listener, if (unlikely((section->offset_within_address_space & ~qemu_real_host_page_mask) != (section->offset_within_region & ~qemu_real_host_page_mask))) { - error_report("%s received unaligned region", __func__); + if (!vfio_known_safe_misalignment(section)) { + error_report("%s received unaligned region %s iova=0x%"PRIx64 + " offset_within_region=0x%"PRIx64 + " qemu_real_host_page_mask=0x%"PRIxPTR, + __func__, memory_region_name(section->mr), + section->offset_within_address_space, + section->offset_within_region, + qemu_real_host_page_mask); + } return; } diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 0ef1b5f4a65..6f38a2e6991 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -100,6 +100,7 @@ vfio_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING region_add vfio_spapr_group_attach(int groupfd, int tablefd) "Attached groupfd %d to liobn fd %d" vfio_listener_region_add_iommu(uint64_t start, uint64_t end) "region_add [iommu] 0x%"PRIx64" - 0x%"PRIx64 vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" +vfio_known_safe_misalignment(const char *name, uint64_t iova, uint64_t offset_within_region, uint64_t page_size) "Region \"%s\" iova=0x%"PRIx64" offset_within_region=0x%"PRIx64" qemu_real_host_page_mask=0x%"PRIxPTR ": cannot be mapped for DMA" vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA" vfio_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del 0x%"PRIx64" - 0x%"PRIx64 vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64
The CRB command buffer currently is a RAM MemoryRegion and given its base address alignment, it causes an error report on vfio_listener_region_add(). This region could have been a RAM device region, easing the detection of such safe situation but this option was not well received. So let's add a helper function that uses the memory region owner type to detect the situation is safe wrt the assignment. Other device types can be checked here if such kind of problem occurs again. Signed-off-by: Eric Auger <eric.auger@redhat.com> --- v1 -> v2: - do not check the MR name but rather the owner type --- hw/vfio/common.c | 27 ++++++++++++++++++++++++++- hw/vfio/trace-events | 1 + 2 files changed, 27 insertions(+), 1 deletion(-)