x86/svm: Fix svm_vmcb_dump() when used in current context

x86/svm: Fix svm_vmcb_dump() when used in current context

VMExit doesn't switch all state.  The FS/GS/TS/LDTR/GSBASE segment
information, and SYSCALL/SYSENTER MSRs may still be cached in hardware, rather
than up-to-date in the VMCB.

Export svm_sync_vmcb() via svmdebug.h so svm_vmcb_dump() can use it, and bring
the VMCB into sync in current context.

As a minor optimisation, switch svm_sync_vmcb() to use svm_vm{load,save}_pa(),
as svm->vmcb_pa is always correct, and this avoids a redundant __pa()
translation behind the scenes.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Brian Woods <brian.woods@amd.com>