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| author | Fuad Tabba <tabba@google.com> | 2025-07-29 15:54:40 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-08-27 04:35:00 -0400 |
| commit | d1e54dd08f163a9021433020d16a8f8f70ddc41c (patch) | |
| tree | 354eef627da1c97d9b76ff5e31a97b707d588bdc /include | |
| parent | KVM: Fix comment that refers to kvm uapi header path (diff) | |
| download | linux-d1e54dd08f163a9021433020d16a8f8f70ddc41c.tar.gz linux-d1e54dd08f163a9021433020d16a8f8f70ddc41c.zip | |
KVM: x86: Enable KVM_GUEST_MEMFD for all 64-bit builds
Enable KVM_GUEST_MEMFD for all KVM x86 64-bit builds, i.e. for "default"
VM types when running on 64-bit KVM. This will allow using guest_memfd
to back non-private memory for all VM shapes, by supporting mmap() on
guest_memfd.
Opportunistically clean up various conditionals that become tautologies
once x86 selects KVM_GUEST_MEMFD more broadly. Specifically, because
SW protected VMs, SEV, and TDX are all 64-bit only, private memory no
longer needs to take explicit dependencies on KVM_GUEST_MEMFD, because
it is effectively a prerequisite.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250729225455.670324-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kvm_host.h | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 56ea8c862cfd..4d1c44622056 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -719,11 +719,7 @@ static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu) } #endif -/* - * Arch code must define kvm_arch_has_private_mem if support for guest_memfd is - * enabled. - */ -#if !defined(kvm_arch_has_private_mem) && !IS_ENABLED(CONFIG_KVM_GUEST_MEMFD) +#ifndef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES static inline bool kvm_arch_has_private_mem(struct kvm *kvm) { return false; @@ -2505,8 +2501,7 @@ bool kvm_arch_post_set_memory_attributes(struct kvm *kvm, static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn) { - return IS_ENABLED(CONFIG_KVM_GUEST_MEMFD) && - kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE; + return kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE; } #else static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn) |