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| author | Sean Christopherson <seanjc@google.com> | 2024-02-23 12:42:28 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-04-09 10:20:29 -0700 |
| commit | 331282fdb15edaf1beb1d27a64d3f65a34d7394d (patch) | |
| tree | ba9c5130065442b2b0e8b8989ebf22488e748a2c /arch | |
| parent | 7774c8f32e99b1f314c0df7c204a897792b4f378 (diff) | |
| download | linux-stable-331282fdb15edaf1beb1d27a64d3f65a34d7394d.tar.gz linux-stable-331282fdb15edaf1beb1d27a64d3f65a34d7394d.tar.bz2 linux-stable-331282fdb15edaf1beb1d27a64d3f65a34d7394d.zip | |
KVM: SVM: Drop 32-bit "support" from __svm_sev_es_vcpu_run()
Drop 32-bit "support" from __svm_sev_es_vcpu_run(), as SEV/SEV-ES firmly
64-bit only. The "support" was purely the result of bad copy+paste from
__svm_vcpu_run(), which in turn was slightly less bad copy+paste from
__vmx_vcpu_run().
Opportunistically convert to unadulterated register accesses so that it's
easier (but still not easy) to follow which registers hold what arguments,
and when.
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240223204233.3337324-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm/vmenter.S | 44 |
1 files changed, 13 insertions, 31 deletions
diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S index 6f57d496867a..c057866a459b 100644 --- a/arch/x86/kvm/svm/vmenter.S +++ b/arch/x86/kvm/svm/vmenter.S @@ -298,17 +298,12 @@ SYM_FUNC_END(__svm_vcpu_run) * @spec_ctrl_intercepted: bool */ SYM_FUNC_START(__svm_sev_es_vcpu_run) - push %_ASM_BP -#ifdef CONFIG_X86_64 + push %rbp push %r15 push %r14 push %r13 push %r12 -#else - push %edi - push %esi -#endif - push %_ASM_BX + push %rbx /* * Save variables needed after vmexit on the stack, in inverse @@ -316,39 +311,31 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run) */ /* Accessed directly from the stack in RESTORE_HOST_SPEC_CTRL. */ - push %_ASM_ARG2 + push %rsi /* Save @svm. */ - push %_ASM_ARG1 - -.ifnc _ASM_ARG1, _ASM_DI - /* - * Stash @svm in RDI early. On 32-bit, arguments are in RAX, RCX - * and RDX which are clobbered by RESTORE_GUEST_SPEC_CTRL. - */ - mov %_ASM_ARG1, %_ASM_DI -.endif + push %rdi /* Clobbers RAX, RCX, RDX. */ RESTORE_GUEST_SPEC_CTRL /* Get svm->current_vmcb->pa into RAX. */ - mov SVM_current_vmcb(%_ASM_DI), %_ASM_AX - mov KVM_VMCB_pa(%_ASM_AX), %_ASM_AX + mov SVM_current_vmcb(%rdi), %rax + mov KVM_VMCB_pa(%rax), %rax /* Enter guest mode */ sti -1: vmrun %_ASM_AX +1: vmrun %rax 2: cli /* Pop @svm to RDI, guest registers have been saved already. */ - pop %_ASM_DI + pop %rdi #ifdef CONFIG_MITIGATION_RETPOLINE /* IMPORTANT: Stuff the RSB immediately after VM-Exit, before RET! */ - FILL_RETURN_BUFFER %_ASM_AX, RSB_CLEAR_LOOPS, X86_FEATURE_RETPOLINE + FILL_RETURN_BUFFER %rax, RSB_CLEAR_LOOPS, X86_FEATURE_RETPOLINE #endif /* Clobbers RAX, RCX, RDX. */ @@ -364,26 +351,21 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run) UNTRAIN_RET_VM /* "Pop" @spec_ctrl_intercepted. */ - pop %_ASM_BX + pop %rbx - pop %_ASM_BX + pop %rbx -#ifdef CONFIG_X86_64 pop %r12 pop %r13 pop %r14 pop %r15 -#else - pop %esi - pop %edi -#endif - pop %_ASM_BP + pop %rbp RET RESTORE_GUEST_SPEC_CTRL_BODY RESTORE_HOST_SPEC_CTRL_BODY -3: cmpb $0, _ASM_RIP(kvm_rebooting) +3: cmpb $0, kvm_rebooting(%rip) jne 2b ud2 |