x86: vMCE emulation

This patch provides virtual MCE support to guest. It emulates a simple
and clean MCE MSRs interface to guest by faking caps to guest if needed
and masking caps if unnecessary:
1. Providing a well-defined MCG_CAP to guest, filter out un-necessary
   caps and provide only guest needed caps;
2. Disabling MCG_CTL to avoid model specific;
3. Sticking all 1's to MCi_CTL to guest to avoid model specific;
4. Enabling CMCI cap but never really inject to guest to prevent
   polling periodically;
5. Masking MSCOD field of MCi_STATUS to avoid model specific;
6. Keeping natural semantics by per-vcpu instead of per-domain
   variables;
7. Using bank1 and reserving bank0 to work around 'bank0 quirk' of some
   very old processors;
8. Cleaning some vMCE# injection logic which shared by Intel and AMD
   but useless under new vMCE implement;
9. Keeping compatilbe w/ old xen version which has been backported to
   SLES11 SP2, so that old vMCE would not blocked when migrate to new
   vMCE;

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>

- make printing consistent (and non-exploitable)
- fix return values of intel_mce_{rd,wr}msr() for out of range banks
- miscellaneous cleanup

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Jan Beulich <jbeulich@suse.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index ec0d06f79f..d0c516a3ee 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -577,9 +577,6 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
 
         if ( (rc = iommu_domain_init(d)) != 0 )
             goto fail;
-
-        /* For Guest vMCE MSRs virtualization */
-        vmce_init_msr(d);
     }
 
     if ( is_hvm_domain(d) )
@@ -606,7 +603,6 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
 
  fail:
     d->is_dying = DOMDYING_dead;
-    vmce_destroy_msr(d);
     cleanup_domain_irq_mapping(d);
     free_xenheap_page(d->shared_info);
     if ( paging_initialised )
@@ -629,7 +625,6 @@ void arch_domain_destroy(struct domain *d)
     else
         xfree(d->arch.pv_domain.e820);
 
-    vmce_destroy_msr(d);
     free_domain_pirqs(d);
     if ( !is_idle_domain(d) )
         iommu_domain_destroy(d);