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KVM: SVM: Remove TSS reloading code after VMEXIT

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Remove the dedicated post-VMEXIT TSS reloading code now that KVM uses
VMLOAD to load host segment state, which includes TSS state.

Fixes: e79b91bb3c ("KVM: SVM: use vmsave/vmload for saving/restoring additional host state")
Reported-by: Venkatesh Srinivas <venkateshs@google.com>
Suggested-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230523165635.4002711-1-mizhang@google.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Mingwei Zhang 2023-05-23 16:56:35 +00:00 • committed by Sean Christopherson
parent b9846a698c
commit 0d3518d2f8
2 changed files with 0 additions and 25 deletions
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24
arch/x86/kvm/svm/svm.c
View file

@ -244,15 +244,6 @@ static u8 rsm_ins_bytes[] = "\x0f\xaa";
static unsigned long iopm_base;
struct kvm_ldttss_desc {
u16 limit0;
u16 base0;
unsigned base1:8, type:5, dpl:2, p:1;
unsigned limit1:4, zero0:3, g:1, base2:8;
u32 base3;
u32 zero1;
} __attribute__((packed));
DEFINE_PER_CPU(struct svm_cpu_data, svm_data);
/*
@ -588,7 +579,6 @@ static int svm_hardware_enable(void)
struct svm_cpu_data *sd;
uint64_t efer;
struct desc_struct *gdt;
int me = raw_smp_processor_id();
rdmsrl(MSR_EFER, efer);
@ -601,9 +591,6 @@ static int svm_hardware_enable(void)
sd->next_asid = sd->max_asid + 1;
sd->min_asid = max_sev_asid + 1;
gdt = get_current_gdt_rw();
sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
wrmsrl(MSR_EFER, efer | EFER_SVME);
wrmsrl(MSR_VM_HSAVE_PA, sd->save_area_pa);
@ -3457,14 +3444,6 @@ static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
return svm_invoke_exit_handler(vcpu, exit_code);
}
static void reload_tss(struct kvm_vcpu *vcpu)
{
struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);
sd->tss_desc->type = 9; /* available 32/64-bit TSS */
load_TR_desc();
}
static void pre_svm_run(struct kvm_vcpu *vcpu)
{
struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);
@ -4099,9 +4078,6 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
svm_vcpu_enter_exit(vcpu, spec_ctrl_intercepted);
if (!sev_es_guest(vcpu->kvm))
reload_tss(vcpu);
if (!static_cpu_has(X86_FEATURE_V_SPEC_CTRL))
x86_spec_ctrl_restore_host(svm->virt_spec_ctrl);

1
arch/x86/kvm/svm/svm.h
View file

@ -303,7 +303,6 @@ struct svm_cpu_data {
u32 max_asid;
u32 next_asid;
u32 min_asid;
struct kvm_ldttss_desc *tss_desc;
struct page *save_area;
unsigned long save_area_pa;