[Xen-changelog] [xen staging] x86/vvmx: correctly report vvmcs size

[patchbot@xxxxxxx]

commit 8885ac7f1833ff54c1d4119d0242e89fb282e294
Author:     Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
AuthorDate: Wed Nov 14 10:23:22 2018 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Nov 14 18:42:48 2018 +0000

    x86/vvmx: correctly report vvmcs size
    
    The size of Xen's virtual vmcs region is 4096 bytes (see comment about
    Virtual VMCS layout in include/asm-x86/hvm/vmx/vvmx.h). Correctly report
    it to the guest in case when VMCS shadowing is not available instead of
    providing H/W value (which is usually smaller).
    
    Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 1cb4af5113..610236e3f2 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -2091,6 +2091,14 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         data = (host_data & (~0ul << 32)) |
                (vmcs->vmcs_revision_id & 0x7fffffff);
         unmap_domain_page(vmcs);
+
+        if ( !cpu_has_vmx_vmcs_shadowing )
+        {
+            /* Report vmcs_region_size as 4096 */
+            data &= ~VMX_BASIC_VMCS_SIZE_MASK;
+            data |= 1ULL << 44;
+        }
+
         break;
     }
     case MSR_IA32_VMX_PINBASED_CTLS:
--
generated by git-patchbot for /home/xen/git/xen.git#staging

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog