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KVM: add support for AMD nested live migration

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Support for nested guest live migration is part of Linux 5.8, add the
corresponding code to QEMU.  The migration format consists of a few
flags, is an opaque 4k blob.

The blob is in VMCB format (the control area represents the L1 VMCB
control fields, the save area represents the pre-vmentry state; KVM does
not use the host save area since the AMD manual allows that) but QEMU
does not really care about that.  However, the flags need to be
copied to hflags/hflags2 and back.

In addition, support for retrieving and setting the AMD nested virtualization
states allows the L1 guest to be reset while running a nested guest, but
a small bug in CPU reset needs to be fixed for that to work.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-05-20 10:49:22 -04:00
parent 418b0f93d1
commit b16c0e20c7
4 changed files with 70 additions and 9 deletions
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5
target/i386/cpu.h
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@ -2118,6 +2118,11 @@ static inline bool cpu_has_vmx(CPUX86State *env)
return env->features[FEAT_1_ECX] & CPUID_EXT_VMX;
}
static inline bool cpu_has_svm(CPUX86State *env)
{
return env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM;
}
/*
* In order for a vCPU to enter VMX operation it must have CR4.VMXE set.
* Since it was set, CR4.VMXE must remain set as long as vCPU is in