KVM: SVM: restore host save area from assembly

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Allow access to the percpu area via the GS segment base, which is
needed in order to access the saved host spec_ctrl value.  In linux-next
FILL_RETURN_BUFFER also needs to access percpu data.

For simplicity, the physical address of the save area is added to struct
svm_cpu_data.

Cc: stable@vger.kernel.org
Fixes: a149180fbc ("x86: Add magic AMD return-thunk")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Analyzed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2022-11-07 03:49:59 -05:00

parent e61ab42de8

commit e287bd005a

5 changed files with 26 additions and 13 deletions

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1

arch/x86/kvm/kvm-asm-offsets.c

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14

arch/x86/kvm/svm/svm.c

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2

arch/x86/kvm/svm/svm.h

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5

arch/x86/kvm/svm/svm_ops.h

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17

arch/x86/kvm/svm/vmenter.S

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