xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: x86: INIT and reset sequences are different

Browse Source 
x86 architecture defines differences between the reset and INIT sequences.
INIT does not initialize the FPU (including MMX, XMM, YMM, etc.), TSC, PMU,
MSRs (in general), MTRRs machine-check, APIC ID, APIC arbitration ID and BSP.

References (from Intel SDM):

"If the MP protocol has completed and a BSP is chosen, subsequent INITs (either
to a specific processor or system wide) do not cause the MP protocol to be
repeated." [8.4.2: MP Initialization Protocol Requirements and Restrictions]

[Table 9-1. IA-32 Processor States Following Power-up, Reset, or INIT]

"If the processor is reset by asserting the INIT# pin, the x87 FPU state is not
changed." [9.2: X87 FPU INITIALIZATION]

"The state of the local APIC following an INIT reset is the same as it is after
a power-up or hardware reset, except that the APIC ID and arbitration ID
registers are not affected." [10.4.7.3: Local APIC State After an INIT Reset
("Wait-for-SIPI" State)]

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <1428924848-28212-1-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit
2015-04-13 14:34:08 +03:00
committed by Paolo Bonzini
parent 90de4a1875
commit d28bc9dd25
6 changed files with 63 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
arch/x86/kvm/x86.c
View File

@@ -7033,7 +7033,7 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
return 0;
}
int fx_init(struct kvm_vcpu *vcpu)
int fx_init(struct kvm_vcpu *vcpu, bool init_event)
{
int err;
@@ -7041,7 +7041,9 @@ int fx_init(struct kvm_vcpu *vcpu)
if (err)
return err;
fpu_finit(&vcpu->arch.guest_fpu);
if (!init_event)
fpu_finit(&vcpu->arch.guest_fpu);
if (cpu_has_xsaves)
vcpu->arch.guest_fpu.state->xsave.xsave_hdr.xcomp_bv =
host_xcr0 | XSTATE_COMPACTION_ENABLED;
@@ -7121,7 +7123,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
r = vcpu_load(vcpu);
if (r)
return r;
kvm_vcpu_reset(vcpu);
kvm_vcpu_reset(vcpu, false);
kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
@@ -7159,7 +7161,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
kvm_x86_ops->vcpu_free(vcpu);
}
void kvm_vcpu_reset(struct kvm_vcpu *vcpu)
void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
{
atomic_set(&vcpu->arch.nmi_queued, 0);
vcpu->arch.nmi_pending = 0;
@@ -7186,13 +7188,14 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu)
kvm_async_pf_hash_reset(vcpu);
vcpu->arch.apf.halted = false;
kvm_pmu_reset(vcpu);
if (!init_event)
kvm_pmu_reset(vcpu);
memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
vcpu->arch.regs_avail = ~0;
vcpu->arch.regs_dirty = ~0;
kvm_x86_ops->vcpu_reset(vcpu);
kvm_x86_ops->vcpu_reset(vcpu, init_event);
}
void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
@@ -7381,7 +7384,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
goto fail_free_mce_banks;
}
r = fx_init(vcpu);
r = fx_init(vcpu, false);
if (r)
goto fail_free_wbinvd_dirty_mask;