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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>
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|---|---|---|
| .. | ||
| hvf | ||
| arch_dump.c | ||
| arch_memory_mapping.c | ||
| bpt_helper.c | ||
| cc_helper_template.h | ||
| cc_helper.c | ||
| cpu-param.h | ||
| cpu-qom.h | ||
| cpu.c | ||
| cpu.h | ||
| excp_helper.c | ||
| fpu_helper.c | ||
| gdbstub.c | ||
| hax-all.c | ||
| hax-i386.h | ||
| hax-interface.h | ||
| hax-mem.c | ||
| hax-posix.c | ||
| hax-posix.h | ||
| hax-windows.c | ||
| hax-windows.h | ||
| helper.c | ||
| helper.h | ||
| hyperv-proto.h | ||
| hyperv-stub.c | ||
| hyperv.c | ||
| hyperv.h | ||
| int_helper.c | ||
| kvm_i386.h | ||
| kvm-stub.c | ||
| kvm.c | ||
| machine.c | ||
| Makefile.objs | ||
| mem_helper.c | ||
| misc_helper.c | ||
| monitor.c | ||
| mpx_helper.c | ||
| ops_sse_header.h | ||
| ops_sse.h | ||
| seg_helper.c | ||
| sev_i386.h | ||
| sev-stub.c | ||
| sev.c | ||
| shift_helper_template.h | ||
| smm_helper.c | ||
| svm_helper.c | ||
| svm.h | ||
| tcg-stub.c | ||
| trace-events | ||
| translate.c | ||
| whp-dispatch.h | ||
| whpx-all.c | ||
| xsave_helper.c | ||