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Re: [Qemu-devel] [PATCH] target-i386: kvm: 'kvm_get_supported_msrs' clea
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] target-i386: kvm: 'kvm_get_supported_msrs' cleanup |
Date: |
Thu, 25 Jul 2019 17:43:26 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 |
On 25/07/19 17:16, Li Qiang wrote:
> Function 'kvm_get_supported_msrs' is only called once
> now, get rid of the static variable 'kvm_supported_msrs'.
>
> Signed-off-by: Li Qiang <address@hidden>
Queued, thanks.
Paolo
> ---
> target/i386/kvm.c | 185 +++++++++++++++++++++++-----------------------
> 1 file changed, 91 insertions(+), 94 deletions(-)
>
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index dbbb13772a..07c9250f45 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -1837,108 +1837,105 @@ static int kvm_get_supported_feature_msrs(KVMState
> *s)
>
> static int kvm_get_supported_msrs(KVMState *s)
> {
> - static int kvm_supported_msrs;
> int ret = 0;
> + struct kvm_msr_list msr_list, *kvm_msr_list;
>
> - /* first time */
> - if (kvm_supported_msrs == 0) {
> - struct kvm_msr_list msr_list, *kvm_msr_list;
> + /*
> + * Obtain MSR list from KVM. These are the MSRs that we must
> + * save/restore.
> + */
> + msr_list.nmsrs = 0;
> + ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, &msr_list);
> + if (ret < 0 && ret != -E2BIG) {
> + return ret;
> + }
> + /*
> + * Old kernel modules had a bug and could write beyond the provided
> + * memory. Allocate at least a safe amount of 1K.
> + */
> + kvm_msr_list = g_malloc0(MAX(1024, sizeof(msr_list) +
> + msr_list.nmsrs *
> + sizeof(msr_list.indices[0])));
>
> - kvm_supported_msrs = -1;
> + kvm_msr_list->nmsrs = msr_list.nmsrs;
> + ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
> + if (ret >= 0) {
> + int i;
>
> - /* Obtain MSR list from KVM. These are the MSRs that we must
> - * save/restore */
> - msr_list.nmsrs = 0;
> - ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, &msr_list);
> - if (ret < 0 && ret != -E2BIG) {
> - return ret;
> - }
> - /* Old kernel modules had a bug and could write beyond the provided
> - memory. Allocate at least a safe amount of 1K. */
> - kvm_msr_list = g_malloc0(MAX(1024, sizeof(msr_list) +
> - msr_list.nmsrs *
> - sizeof(msr_list.indices[0])));
> -
> - kvm_msr_list->nmsrs = msr_list.nmsrs;
> - ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
> - if (ret >= 0) {
> - int i;
> -
> - for (i = 0; i < kvm_msr_list->nmsrs; i++) {
> - switch (kvm_msr_list->indices[i]) {
> - case MSR_STAR:
> - has_msr_star = true;
> - break;
> - case MSR_VM_HSAVE_PA:
> - has_msr_hsave_pa = true;
> - break;
> - case MSR_TSC_AUX:
> - has_msr_tsc_aux = true;
> - break;
> - case MSR_TSC_ADJUST:
> - has_msr_tsc_adjust = true;
> - break;
> - case MSR_IA32_TSCDEADLINE:
> - has_msr_tsc_deadline = true;
> - break;
> - case MSR_IA32_SMBASE:
> - has_msr_smbase = true;
> - break;
> - case MSR_SMI_COUNT:
> - has_msr_smi_count = true;
> - break;
> - case MSR_IA32_MISC_ENABLE:
> - has_msr_misc_enable = true;
> - break;
> - case MSR_IA32_BNDCFGS:
> - has_msr_bndcfgs = true;
> - break;
> - case MSR_IA32_XSS:
> - has_msr_xss = true;
> - break;
> - case HV_X64_MSR_CRASH_CTL:
> - has_msr_hv_crash = true;
> - break;
> - case HV_X64_MSR_RESET:
> - has_msr_hv_reset = true;
> - break;
> - case HV_X64_MSR_VP_INDEX:
> - has_msr_hv_vpindex = true;
> - break;
> - case HV_X64_MSR_VP_RUNTIME:
> - has_msr_hv_runtime = true;
> - break;
> - case HV_X64_MSR_SCONTROL:
> - has_msr_hv_synic = true;
> - break;
> - case HV_X64_MSR_STIMER0_CONFIG:
> - has_msr_hv_stimer = true;
> - break;
> - case HV_X64_MSR_TSC_FREQUENCY:
> - has_msr_hv_frequencies = true;
> - break;
> - case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
> - has_msr_hv_reenlightenment = true;
> - break;
> - case MSR_IA32_SPEC_CTRL:
> - has_msr_spec_ctrl = true;
> - break;
> - case MSR_VIRT_SSBD:
> - has_msr_virt_ssbd = true;
> - break;
> - case MSR_IA32_ARCH_CAPABILITIES:
> - has_msr_arch_capabs = true;
> - break;
> - case MSR_IA32_CORE_CAPABILITY:
> - has_msr_core_capabs = true;
> - break;
> - }
> + for (i = 0; i < kvm_msr_list->nmsrs; i++) {
> + switch (kvm_msr_list->indices[i]) {
> + case MSR_STAR:
> + has_msr_star = true;
> + break;
> + case MSR_VM_HSAVE_PA:
> + has_msr_hsave_pa = true;
> + break;
> + case MSR_TSC_AUX:
> + has_msr_tsc_aux = true;
> + break;
> + case MSR_TSC_ADJUST:
> + has_msr_tsc_adjust = true;
> + break;
> + case MSR_IA32_TSCDEADLINE:
> + has_msr_tsc_deadline = true;
> + break;
> + case MSR_IA32_SMBASE:
> + has_msr_smbase = true;
> + break;
> + case MSR_SMI_COUNT:
> + has_msr_smi_count = true;
> + break;
> + case MSR_IA32_MISC_ENABLE:
> + has_msr_misc_enable = true;
> + break;
> + case MSR_IA32_BNDCFGS:
> + has_msr_bndcfgs = true;
> + break;
> + case MSR_IA32_XSS:
> + has_msr_xss = true;
> + break;
> + case HV_X64_MSR_CRASH_CTL:
> + has_msr_hv_crash = true;
> + break;
> + case HV_X64_MSR_RESET:
> + has_msr_hv_reset = true;
> + break;
> + case HV_X64_MSR_VP_INDEX:
> + has_msr_hv_vpindex = true;
> + break;
> + case HV_X64_MSR_VP_RUNTIME:
> + has_msr_hv_runtime = true;
> + break;
> + case HV_X64_MSR_SCONTROL:
> + has_msr_hv_synic = true;
> + break;
> + case HV_X64_MSR_STIMER0_CONFIG:
> + has_msr_hv_stimer = true;
> + break;
> + case HV_X64_MSR_TSC_FREQUENCY:
> + has_msr_hv_frequencies = true;
> + break;
> + case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
> + has_msr_hv_reenlightenment = true;
> + break;
> + case MSR_IA32_SPEC_CTRL:
> + has_msr_spec_ctrl = true;
> + break;
> + case MSR_VIRT_SSBD:
> + has_msr_virt_ssbd = true;
> + break;
> + case MSR_IA32_ARCH_CAPABILITIES:
> + has_msr_arch_capabs = true;
> + break;
> + case MSR_IA32_CORE_CAPABILITY:
> + has_msr_core_capabs = true;
> + break;
> }
> }
> -
> - g_free(kvm_msr_list);
> }
>
> + g_free(kvm_msr_list);
> +
> return ret;
> }
>
>