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a=ed25519-sha256; t=1773382364; l=1210; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=eHYnZ4b1YfTkQYFRV/vwy19bweLPw9di8nJ0CgUFfP0=; b=rqiNCCUj0FITl4TSW1UUj0oq7hsYbkSvZt06OqDlmcSg6UpNG7FtqMbblYVVtVwfIs39KRqkE zn6/r8J1IIsB66DPTP29Y9PgGogkWFKfLEPrDDUIU4WjVn8xw4GWd+6 X-Mailer: b4 0.14.3 Message-ID: <20260313-gmem-inplace-conversion-v3-41-5fc12a70ec89@google.com> Subject: [PATCH RFC v3 41/43] KVM: x86: Support content mode ZERO for TDX 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" Support content mode ZERO for TDX by doing nothing, since TDX firmware will zero for the host on private to shared conversions. Signed-off-by: Ackerley Tng --- arch/x86/kvm/x86.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 49c19897a9c30..1354fa89edb09 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -14088,8 +14088,9 @@ u64 kvm_arch_gmem_supported_content_modes(struct kvm *kvm) 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_TDX_VM: + return KVM_SET_MEMORY_ATTRIBUTES2_ZERO; case KVM_X86_DEFAULT_VM: default: WARN_ONCE(1, "Unexpected conversion request for vm_type."); @@ -14103,6 +14104,9 @@ int kvm_arch_gmem_apply_content_mode_zero(struct kvm *kvm, switch (kvm->arch.vm_type) { case KVM_X86_SW_PROTECTED_VM: return kvm_gmem_apply_content_mode_zero(folio); + case KVM_X86_TDX_VM: + /* Rely on TDX firmware to do zeroing. */ + return 0; default: WARN_ONCE(1, "Unexpected request to zero for vm_type."); return -EOPNOTSUPP; -- 2.53.0.851.ga537e3e6e9-goog