20201029140457.126965-1-ubizjak@xxxxxxxxx>
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This is a note to let you know that I've just added the patch titled
KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-vmx-use-test-reg-reg-instead-of-cmp-0-reg-in-vmenter.s.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Oct 5 12:28:43 PM CEST 2022
From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Date: Mon, 3 Oct 2022 10:10:25 -0300
Subject: KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S
To: stable@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, bp@xxxxxxxxx, pbonzini@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, jpoimboe@xxxxxxxxxx
Message-ID: <20221003131038.12645-25-cascardo@xxxxxxxxxxxxx>
From: Uros Bizjak <ubizjak@xxxxxxxxx>
commit 6c44221b05236cc65d76cb5dc2463f738edff39d upstream.
Saves one byte in __vmx_vcpu_run for the same functionality.
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Message-Id: <20201029140457.126965-1-ubizjak@xxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx/vmenter.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -135,7 +135,7 @@ ENTRY(__vmx_vcpu_run)
mov (%_ASM_SP), %_ASM_AX
/* Check if vmlaunch or vmresume is needed */
- cmpb $0, %bl
+ testb %bl, %bl
/* Load guest registers. Don't clobber flags. */
mov VCPU_RBX(%_ASM_AX), %_ASM_BX
Patches currently in stable-queue which might be from cascardo@xxxxxxxxxxxxx are
queue-5.4/x86-speculation-disable-rrsba-behavior.patch
queue-5.4/kvm-vmx-flatten-__vmx_vcpu_run.patch
queue-5.4/x86-kvm-vmx-make-noinstr-clean.patch
queue-5.4/revert-x86-speculation-add-rsb-vm-exit-protections.patch
queue-5.4/kvm-vmx-fix-ibrs-handling-after-vmexit.patch
queue-5.4/kvm-vmx-prevent-guest-rsb-poisoning-attacks-with-eibrs.patch
queue-5.4/kvm-nvmx-use-__vmx_vcpu_run-in-nested_vmx_check_vmentry_hw.patch
queue-5.4/x86-bugs-keep-a-per-cpu-ia32_spec_ctrl-value.patch
queue-5.4/x86-cpu-amd-enumerate-btc_no.patch
queue-5.4/x86-speculation-fix-firmware-entry-spec_ctrl-handling.patch
queue-5.4/x86-speculation-add-spectre_v2-ibrs-option-to-support-kernel-ibrs.patch
queue-5.4/x86-cpu-add-consistent-cpu-match-macros.patch
queue-5.4/x86-speculation-remove-x86_spec_ctrl_mask.patch
queue-5.4/x86-bugs-add-cannon-lake-to-retbleed-affected-cpu-list.patch
queue-5.4/x86-bugs-warn-when-ibrs-mitigation-is-selected-on-enhanced-ibrs-parts.patch
queue-5.4/x86-speculation-fill-rsb-on-vmexit-for-ibrs.patch
queue-5.4/x86-cpu-add-a-steppings-field-to-struct-x86_cpu_id.patch
queue-5.4/kvm-vmx-convert-launched-argument-to-flags.patch
queue-5.4/x86-common-stamp-out-the-stepping-madness.patch
queue-5.4/x86-bugs-split-spectre_v2_select_mitigation-and-spectre_v2_user_select_mitigation.patch
queue-5.4/x86-bugs-report-intel-retbleed-vulnerability.patch
queue-5.4/x86-speculation-change-fill_return_buffer-to-work-with-objtool.patch
queue-5.4/x86-cpufeatures-move-retpoline-flags-to-word-11.patch
queue-5.4/x86-speculation-fix-spec_ctrl-write-on-smt-state-change.patch
queue-5.4/kvm-vmx-use-test-reg-reg-instead-of-cmp-0-reg-in-vmenter.s.patch
queue-5.4/x86-bugs-optimize-spec_ctrl-msr-writes.patch
queue-5.4/x86-bugs-report-amd-retbleed-vulnerability.patch
queue-5.4/x86-speculation-fix-rsb-filling-with-config_retpoline-n.patch
queue-5.4/intel_idle-disable-ibrs-during-long-idle.patch
queue-5.4/x86-speculation-use-declare_per_cpu-for-x86_spec_ctrl_current.patch
queue-5.4/x86-entry-remove-skip_r11rcx.patch
queue-5.4/x86-speculation-use-cached-host-spec_ctrl-value-for-guest-entry-exit.patch
queue-5.4/x86-devicetable-move-x86-specific-macro-out-of-generic-code.patch
queue-5.4/x86-bugs-add-amd-retbleed-boot-parameter.patch
queue-5.4/x86-entry-add-kernel-ibrs-implementation.patch
queue-5.4/revert-x86-cpu-add-a-steppings-field-to-struct-x86_cpu_id.patch
queue-5.4/x86-speculation-add-rsb-vm-exit-protections.patch
