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author | Xiaoyao Li <xiaoyao.li@intel.com> | 2024-03-20 03:39:06 -0500 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-04-23 17:35:25 +0200 |
commit | 0811baed49010a9b651b8029ab6b9828b09a884f (patch) | |
tree | 260b05bbc1ab1000ddf3f40eeefd46f9bd3d9476 /accel/kvm | |
parent | 72853afc638b3e28779c86dd05da2f3bb149fe2c (diff) | |
download | qemu-0811baed49010a9b651b8029ab6b9828b09a884f.zip qemu-0811baed49010a9b651b8029ab6b9828b09a884f.tar.gz qemu-0811baed49010a9b651b8029ab6b9828b09a884f.tar.bz2 |
kvm: Introduce support for memory_attributes
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>
Diffstat (limited to 'accel/kvm')
-rw-r--r-- | accel/kvm/kvm-all.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index ed50c80..db0b1a1 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -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); |