KVM: VMX: Do not declare vmread_error() asmlinkage

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There is no need to declare vmread_error() asmlinkage, its arguments
can be passed via registers for both 32-bit and 64-bit targets.
Function argument registers are considered call-clobbered registers,
they are saved in the trampoline just before the function call and
restored afterwards.

Dropping "asmlinkage" patch unifies trampoline function argument handling
between 32-bit and 64-bit targets and improves generated code for 32-bit
targets.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20220817144045.3206-1-ubizjak@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Uros Bizjak 2022-08-17 16:40:45 +02:00 • committed by Paolo Bonzini

parent e390f4d69d

commit 57abfa11ba

3 changed files with 5 additions and 14 deletions

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15

arch/x86/kvm/vmx/vmenter.S

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2

arch/x86/kvm/vmx/vmx.c

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2

arch/x86/kvm/vmx/vmx_ops.h

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