5009ef22c6
hvf_reset_vcpu() duplicates actions performed by x86_cpu_reset(). The
difference is that hvf_reset_vcpu() stores initial values directly to
VMCS while x86_cpu_reset() stores it in CPUX86State and then
cpu_synchronize_all_post_init() or cpu_synchronize_all_post_reset()
flushes CPUX86State into VMCS. That makes hvf_reset_vcpu() a kind of
no-op.
Here's the trace of CPU state modifications during VM start:
hvf_reset_vcpu (resets VMCS)
cpu_synchronize_all_post_init (overwrites VMCS fields written by
hvf_reset_vcpu())
cpu_synchronize_all_states
hvf_reset_vcpu (resets VMCS)
cpu_synchronize_all_post_reset (overwrites VMCS fields written by
hvf_reset_vcpu())
General purpose registers, system registers, segment descriptors, flags
and IP are set by hvf_put_segments() in post-init and post-reset,
therefore it's safe to remove them from hvf_reset_vcpu().
PDPTE initialization can be dropped because Intel SDM (26.3.1.6 Checks
on Guest Page-Directory-Pointer-Table Entries) doesn't require PDPTE to
be clear unless PAE is used: "A VM entry to a guest that does not use
PAE paging does not check the validity of any PDPTEs."
And if PAE is used, PDPTE's are initialized from CR3 in macvm_set_cr0().
Cc: Cameron Esfahani <dirty@apple.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200630102824.77604-8-r.bolshakov@yadro.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
40 lines
1 KiB
C
40 lines
1 KiB
C
/*
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* QEMU Hypervisor.framework (HVF) support
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*
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* Copyright Google Inc., 2017
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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/* header to be included in non-HVF-specific code */
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#ifndef HVF_H
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#define HVF_H
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#ifdef CONFIG_HVF
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uint32_t hvf_get_supported_cpuid(uint32_t func, uint32_t idx,
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int reg);
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extern bool hvf_allowed;
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#define hvf_enabled() (hvf_allowed)
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#else /* !CONFIG_HVF */
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#define hvf_enabled() 0
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#define hvf_get_supported_cpuid(func, idx, reg) 0
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#endif /* !CONFIG_HVF */
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int hvf_init_vcpu(CPUState *);
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int hvf_vcpu_exec(CPUState *);
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void hvf_cpu_synchronize_state(CPUState *);
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void hvf_cpu_synchronize_post_reset(CPUState *);
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void hvf_cpu_synchronize_post_init(CPUState *);
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void hvf_cpu_synchronize_pre_loadvm(CPUState *);
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void hvf_vcpu_destroy(CPUState *);
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#define TYPE_HVF_ACCEL ACCEL_CLASS_NAME("hvf")
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#define HVF_STATE(obj) \
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OBJECT_CHECK(HVFState, (obj), TYPE_HVF_ACCEL)
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#endif
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