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a=ed25519-sha256; t=1773382364; l=2407; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=zi0vFAbqQQTVybzQ4d6S9xx2RZ2vGjUZ7QlD1D8veaE=; b=o1BGg3s3hX3T3w6RMc4VBLHIMEPRAJ3qHKModFx1Uwf1TqXidghI4On/BHJNfk1vuJqxWuTQM hETvPruZSDoA20O00VnLQLnLa3QLo79hqsbYwTC8q+x8SDSa/B+R6Op X-Mailer: b4 0.14.3 Message-ID: <20260313-gmem-inplace-conversion-v3-40-5fc12a70ec89@google.com> Subject: [PATCH RFC v3 40/43] KVM: x86: Add support for applying content modes From: Ackerley Tng To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, ira.weiny@intel.com, jmattson@google.com, jroedel@suse.de, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Jason Gunthorpe , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Ackerley Tng Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable For x86, override the default implementations of content mode functions to handle reporting of supported content modes, and application of requested modes based on x86 VM types. Signed-off-by: Ackerley Tng --- arch/x86/kvm/x86.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 69 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9c29407712580..49c19897a9c30 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -14078,6 +14078,75 @@ void kvm_arch_gmem_invalidate(kvm_pfn_t start, kvm= _pfn_t end) kvm_x86_call(gmem_invalidate)(start, end); } #endif + +u64 kvm_arch_gmem_supported_content_modes(struct kvm *kvm) +{ + switch (kvm->arch.vm_type) { + case KVM_X86_SW_PROTECTED_VM: + return KVM_SET_MEMORY_ATTRIBUTES2_ZERO | + KVM_SET_MEMORY_ATTRIBUTES2_PRESERVE; + case KVM_X86_SEV_VM: + case KVM_X86_SEV_ES_VM: + case KVM_X86_SNP_VM: + case KVM_X86_TDX_VM: + return 0; + case KVM_X86_DEFAULT_VM: + default: + WARN_ONCE(1, "Unexpected conversion request for vm_type."); + return 0; + } +} + +int kvm_arch_gmem_apply_content_mode_zero(struct kvm *kvm, + struct folio *folio) +{ + switch (kvm->arch.vm_type) { + case KVM_X86_SW_PROTECTED_VM: + return kvm_gmem_apply_content_mode_zero(folio); + default: + WARN_ONCE(1, "Unexpected request to zero for vm_type."); + return -EOPNOTSUPP; + } +} + +int kvm_arch_gmem_apply_content_mode_preserve(struct kvm *kvm, + struct folio *folio) +{ + switch (kvm->arch.vm_type) { + case KVM_X86_SW_PROTECTED_VM: + return 0; + default: + WARN_ONCE(1, "Unexpected request to preserve for vm_type."); + return -EOPNOTSUPP; + } +} + +int kvm_arch_gmem_apply_content_mode_unspecified(struct kvm *kvm, + struct folio *folio) +{ + switch (kvm->arch.vm_type) { + case KVM_X86_SW_PROTECTED_VM: { + char *addr; + int i; + + /* + * KVM_X86_SW_PROTECTED_VM is a test vehicle, this + * case is just for testing and does not need to be + * performant. + */ + for (i =3D 0; i < folio_nr_pages(folio); ++i) { + addr =3D kmap_local_page(folio_page(folio, i)); + get_random_bytes(addr, PAGE_SIZE); + kunmap_local(addr); + } + + return 0; + } + default: + return 0; + } +} + #endif =20 int kvm_spec_ctrl_test_value(u64 value) --=20 2.53.0.851.ga537e3e6e9-goog