On Fri, Aug 18, 2023 at 05:50:19AM -0400, Xiaoyao Li wrote:
> Introduce memory_region_init_ram_gmem() to allocate private gmem on the
> MemoryRegion initialization. It's for the usercase of TDVF, which must
> be private on TDX case.
>
> Signed-off-by: Xiaoyao Li <[email protected]>
> ---
> include/exec/memory.h | 6 +++++
> softmmu/memory.c | 52 +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 58 insertions(+)
> diff --git a/softmmu/memory.c b/softmmu/memory.c
> index af6aa3c1e3c9..ded44dcef1aa 100644
> --- a/softmmu/memory.c
> +++ b/softmmu/memory.c
> @@ -25,6 +25,7 @@
> #include "qom/object.h"
> #include "trace.h"
>
> +#include <linux/kvm.h>
> #include "exec/memory-internal.h"
> #include "exec/ram_addr.h"
> #include "sysemu/kvm.h"
> @@ -3602,6 +3603,57 @@ void memory_region_init_ram(MemoryRegion *mr,
> vmstate_register_ram(mr, owner_dev);
> }
>
> +#ifdef CONFIG_KVM
> +void memory_region_init_ram_gmem(MemoryRegion *mr,
> + Object *owner,
> + const char *name,
> + uint64_t size,
> + Error **errp)
Since you have an 'errp' parameter here....
> +{
> + DeviceState *owner_dev;
> + Error *err = NULL;
> + int priv_fd;
> +
> + memory_region_init_ram_nomigrate(mr, owner, name, size, &err);
> + if (err) {
> + error_propagate(errp, err);
> + return;
> + }
> +
> + if (object_dynamic_cast(OBJECT(current_accel()), TYPE_KVM_ACCEL)) {
> + KVMState *s = KVM_STATE(current_accel());
> + struct kvm_create_guest_memfd gmem = {
> + .size = size,
> + /* TODO: add property to hostmem backend for huge pmd */
> + .flags = KVM_GUEST_MEMFD_ALLOW_HUGEPAGE,
> + };
> +
> + priv_fd = kvm_vm_ioctl(s, KVM_CREATE_GUEST_MEMFD, &gmem);
> + if (priv_fd < 0) {
> + fprintf(stderr, "%s: error creating gmem: %s\n", __func__,
> + strerror(-priv_fd));
> + abort();
It should be using error_setg_errno() here and return not abort
> + }
> + } else {
> + fprintf(stderr, "%s: gmem unsupported accel: %s\n", __func__,
> + current_accel_name());
and error_setg() here and return.
> + abort();
> + }
> +
> + memory_region_set_gmem_fd(mr, priv_fd);
> + memory_region_set_default_private(mr);
> +
> + /* This will assert if owner is neither NULL nor a DeviceState.
> + * We only want the owner here for the purposes of defining a
> + * unique name for migration. TODO: Ideally we should implement
> + * a naming scheme for Objects which are not DeviceStates, in
> + * which case we can relax this restriction.
> + */
> + owner_dev = DEVICE(owner);
> + vmstate_register_ram(mr, owner_dev);
> +}
> +#endif
> +
> void memory_region_init_rom(MemoryRegion *mr,
> Object *owner,
> const char *name,
> --
> 2.34.1
>
With regards,
Daniel
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