| Message ID | 20240320083945.991426-11-michael.roth@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add AMD Secure Nested Paging (SEV-SNP) support | expand |
On 3/20/24 09:39, Michael Roth wrote: > From: Xiaoyao Li <xiaoyao.li@intel.com> > > Introduce the helper functions to set the attributes of a range of > memory to private or shared. > > This is necessary to notify KVM the private/shared attribute of each gpa > range. KVM needs the information to decide the GPA needs to be mapped at > hva-based shared memory or guest_memfd based private memory. > > Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com> > --- > Changes in v4: > - move the check of kvm_supported_memory_attributes to the common > kvm_set_memory_attributes(); (Wang Wei) > - change warn_report() to error_report() in kvm_set_memory_attributes() > and drop the __func__; (Daniel) > > Signed-off-by: Michael Roth <michael.roth@amd.com> > --- > accel/kvm/kvm-all.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ > include/sysemu/kvm.h | 3 +++ > 2 files changed, 47 insertions(+) > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c > index e83429b31e..df7a32735a 100644 > --- a/accel/kvm/kvm-all.c > +++ b/accel/kvm/kvm-all.c > @@ -92,6 +92,7 @@ static bool kvm_has_guest_debug; > static int kvm_sstep_flags; > static bool kvm_immediate_exit; > static bool kvm_guest_memfd_supported; > +static uint64_t kvm_supported_memory_attributes; > static hwaddr kvm_max_slot_size = ~0; > > static const KVMCapabilityInfo kvm_required_capabilites[] = { > @@ -1304,6 +1305,46 @@ void kvm_set_max_memslot_size(hwaddr max_slot_size) > kvm_max_slot_size = max_slot_size; > } > > +static int kvm_set_memory_attributes(hwaddr start, hwaddr size, uint64_t attr) > +{ > + struct kvm_memory_attributes attrs; > + int r; > + > + if (kvm_supported_memory_attributes == 0) { > + error_report("No memory attribute supported by KVM\n"); > + return -EINVAL; > + } > + > + if ((attr & kvm_supported_memory_attributes) != attr) { > + error_report("memory attribute 0x%lx not supported by KVM," > + " supported bits are 0x%lx\n", > + attr, kvm_supported_memory_attributes); > + return -EINVAL; > + } This should also be tested at the same time as kvm_guest_memfd_supported. Paolo > + attrs.attributes = attr; > + attrs.address = start; > + attrs.size = size; > + attrs.flags = 0; > + > + r = kvm_vm_ioctl(kvm_state, KVM_SET_MEMORY_ATTRIBUTES, &attrs); > + if (r) { > + error_report("failed to set memory (0x%lx+%#zx) with attr 0x%lx error '%s'", > + start, size, attr, strerror(errno)); > + } > + return r; > +} > + > +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size) > +{ > + return kvm_set_memory_attributes(start, size, KVM_MEMORY_ATTRIBUTE_PRIVATE); > +} > + > +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size) > +{ > + return kvm_set_memory_attributes(start, size, 0); > +} > + > /* Called with KVMMemoryListener.slots_lock held */ > static void kvm_set_phys_mem(KVMMemoryListener *kml, > MemoryRegionSection *section, bool add) > @@ -2439,6 +2480,9 @@ static int kvm_init(MachineState *ms) > > kvm_guest_memfd_supported = kvm_check_extension(s, KVM_CAP_GUEST_MEMFD); > > + ret = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES); > + kvm_supported_memory_attributes = ret > 0 ? ret : 0; > + > if (object_property_find(OBJECT(current_machine), "kvm-type")) { > g_autofree char *kvm_type = object_property_get_str(OBJECT(current_machine), > "kvm-type", > diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h > index b4913281e2..2cb3192509 100644 > --- a/include/sysemu/kvm.h > +++ b/include/sysemu/kvm.h > @@ -538,4 +538,7 @@ void kvm_mark_guest_state_protected(void); > bool kvm_hwpoisoned_mem(void); > > int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp); > + > +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size); > +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size); > #endif This suggests that
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index e83429b31e..df7a32735a 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -92,6 +92,7 @@ static bool kvm_has_guest_debug; static int kvm_sstep_flags; static bool kvm_immediate_exit; static bool kvm_guest_memfd_supported; +static uint64_t kvm_supported_memory_attributes; static hwaddr kvm_max_slot_size = ~0; static const KVMCapabilityInfo kvm_required_capabilites[] = { @@ -1304,6 +1305,46 @@ void kvm_set_max_memslot_size(hwaddr max_slot_size) kvm_max_slot_size = max_slot_size; } +static int kvm_set_memory_attributes(hwaddr start, hwaddr size, uint64_t attr) +{ + struct kvm_memory_attributes attrs; + int r; + + if (kvm_supported_memory_attributes == 0) { + error_report("No memory attribute supported by KVM\n"); + return -EINVAL; + } + + if ((attr & kvm_supported_memory_attributes) != attr) { + error_report("memory attribute 0x%lx not supported by KVM," + " supported bits are 0x%lx\n", + attr, kvm_supported_memory_attributes); + return -EINVAL; + } + + attrs.attributes = attr; + attrs.address = start; + attrs.size = size; + attrs.flags = 0; + + r = kvm_vm_ioctl(kvm_state, KVM_SET_MEMORY_ATTRIBUTES, &attrs); + if (r) { + error_report("failed to set memory (0x%lx+%#zx) with attr 0x%lx error '%s'", + start, size, attr, strerror(errno)); + } + return r; +} + +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size) +{ + return kvm_set_memory_attributes(start, size, KVM_MEMORY_ATTRIBUTE_PRIVATE); +} + +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size) +{ + return kvm_set_memory_attributes(start, size, 0); +} + /* Called with KVMMemoryListener.slots_lock held */ static void kvm_set_phys_mem(KVMMemoryListener *kml, MemoryRegionSection *section, bool add) @@ -2439,6 +2480,9 @@ static int kvm_init(MachineState *ms) kvm_guest_memfd_supported = kvm_check_extension(s, KVM_CAP_GUEST_MEMFD); + ret = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES); + kvm_supported_memory_attributes = ret > 0 ? ret : 0; + if (object_property_find(OBJECT(current_machine), "kvm-type")) { g_autofree char *kvm_type = object_property_get_str(OBJECT(current_machine), "kvm-type", diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index b4913281e2..2cb3192509 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -538,4 +538,7 @@ void kvm_mark_guest_state_protected(void); bool kvm_hwpoisoned_mem(void); int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp); + +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size); +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size); #endif