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kvm: Introduce support for memory_attributes

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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>
Message-ID: <20240320083945.991426-11-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-03-20 03:39:06 -05:00 committed by Paolo Bonzini
parent 72853afc63
commit 0811baed49
2 changed files with 36 additions and 0 deletions
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32
accel/kvm/kvm-all.c
View file

@ -91,6 +91,7 @@ bool kvm_msi_use_devid;
static bool kvm_has_guest_debug;
static int kvm_sstep_flags;
static bool kvm_immediate_exit;
static uint64_t kvm_supported_memory_attributes;
static hwaddr kvm_max_slot_size = ~0;
static const KVMCapabilityInfo kvm_required_capabilites[] = {
@ -1266,6 +1267,36 @@ 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, uint64_t size, uint64_t attr)
{
struct kvm_memory_attributes attrs;
int r;
assert((attr & kvm_supported_memory_attributes) == attr);
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%" HWADDR_PRIx "+0x%" PRIx64 ") "
"with attr 0x%" PRIx64 " error '%s'",
start, size, attr, strerror(errno));
}
return r;
}
int kvm_set_memory_attributes_private(hwaddr start, uint64_t size)
{
return kvm_set_memory_attributes(start, size, KVM_MEMORY_ATTRIBUTE_PRIVATE);
}
int kvm_set_memory_attributes_shared(hwaddr start, uint64_t 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)
@ -2387,6 +2418,7 @@ static int kvm_init(MachineState *ms)
goto err;
}
kvm_supported_memory_attributes = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);

4
include/sysemu/kvm.h
View file

@ -536,4 +536,8 @@ void kvm_mark_guest_state_protected(void);
* reported for the VM.
*/
bool kvm_hwpoisoned_mem(void);
int kvm_set_memory_attributes_private(hwaddr start, uint64_t size);
int kvm_set_memory_attributes_shared(hwaddr start, uint64_t size);
#endif