KVM: TDX: restore host xsave state when exit from the guest TD

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On exiting from the guest TD, xsave state is clobbered; restore it.
Do not use kvm_load_host_xsave_state(), as it relies on vcpu->arch
to find out whether other KVM_RUN code has loaded guest state into
XCR0/PKRU/XSS or not.  In the case of TDX, the exit values are known
independent of the guest CR0 and CR4, and in fact the latter are not
available.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Message-ID: <20250129095902.16391-8-adrian.hunter@intel.com>
[Rewrite to not use kvm_load_host_xsave_state. - Paolo]
Reviewed-by: Xiayao Li <xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Isaku Yamahata 2025-01-29 11:58:56 +02:00 • committed by Paolo Bonzini

parent 81bf40d54c

commit 6bfa6d8509

1 changed files with 32 additions and 0 deletions

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arch/x86/kvm/vmx/tdx.c

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