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i386/tdx: Set kvm_readonly_mem_enabled to false for TDX VM

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TDX only supports readonly for shared memory but not for private memory.

In the view of QEMU, it has no idea whether a memslot is used as shared
memory of private. Thus just mark kvm_readonly_mem_enabled to false to
TDX VM for simplicity.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-36-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-05-08 10:59:41 -04:00 • committed by Paolo Bonzini
parent 9002494f80
commit da6728658b
1 changed files with 9 additions and 0 deletions
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9
target/i386/kvm/tdx.c
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@ -384,6 +384,15 @@ static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
return -EOPNOTSUPP;
}
/*
* Set kvm_readonly_mem_allowed to false, because TDX only supports readonly
* memory for shared memory but not for private memory. Besides, whether a
* memslot is private or shared is not determined by QEMU.
*
* Thus, just mark readonly memory not supported for simplicity.
*/
kvm_readonly_mem_allowed = false;
qemu_add_machine_init_done_notifier(&tdx_machine_done_notify);
tdx_guest = tdx;