[PATCH v2] libxc: expand cpuid features exposed to PVH guests

[PATCH v2] libxc: expand cpuid features exposed to PVH guests

[Roger Pau Monne]

Expand the cpuid features exposed to PVH guests, this includes
exposing PSE, PGE and 1GB pages (which will be masked by the
hypervisor if not supported by the hardware).

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
---
Changes since v1:
 - Rename autotranslated param to pvh and make it a bool.
---
 tools/libxc/xc_cpuid_x86.c |   14 +++++++++-----
 tools/libxc/xc_domain.c    |    1 +
 tools/libxc/xenctrl.h      |    2 +-
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 8acb9fb..6b81641 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -21,6 +21,7 @@
  */
 
 #include <stdlib.h>
+#include <stdbool.h>
 #include "xc_private.h"
 #include "xc_cpufeature.h"
 #include <xen/hvm/params.h>
@@ -437,7 +438,7 @@ static void xc_cpuid_hvm_policy(
 
 static void xc_cpuid_pv_policy(
     xc_interface *xch, domid_t domid,
-    const unsigned int *input, unsigned int *regs)
+    const unsigned int *input, unsigned int *regs, bool pvh)
 {
     DECLARE_DOMCTL;
     unsigned int guest_width;
@@ -460,8 +461,10 @@ static void xc_cpuid_pv_policy(
     if ( (input[0] & 0x7fffffff) == 0x00000001 )
     {
         clear_bit(X86_FEATURE_VME, regs[3]);
-        clear_bit(X86_FEATURE_PSE, regs[3]);
-        clear_bit(X86_FEATURE_PGE, regs[3]);
+        if ( !pvh ) {
+            clear_bit(X86_FEATURE_PSE, regs[3]);
+            clear_bit(X86_FEATURE_PGE, regs[3]);
+        }
         clear_bit(X86_FEATURE_MCE, regs[3]);
         clear_bit(X86_FEATURE_MCA, regs[3]);
         clear_bit(X86_FEATURE_MTRR, regs[3]);
@@ -530,7 +533,8 @@ static void xc_cpuid_pv_policy(
         {
             set_bit(X86_FEATURE_SYSCALL, regs[3]);
         }
-        clear_bit(X86_FEATURE_PAGE1GB, regs[3]);
+        if ( !pvh )
+            clear_bit(X86_FEATURE_PAGE1GB, regs[3]);
         clear_bit(X86_FEATURE_RDTSCP, regs[3]);
 
         clear_bit(X86_FEATURE_SVM, regs[2]);
@@ -578,7 +582,7 @@ static int xc_cpuid_policy(
     if ( info.hvm )
         xc_cpuid_hvm_policy(xch, domid, input, regs);
     else
-        xc_cpuid_pv_policy(xch, domid, input, regs);
+        xc_cpuid_pv_policy(xch, domid, input, regs, info.pvh);
 
     return 0;
 }
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 0230c6c..c67ac9a 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -348,6 +348,7 @@ int xc_domain_getinfo(xc_interface *xch,
         info->running  = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_running);
         info->hvm      = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_hvm_guest);
         info->debugged = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_debugged);
+        info->pvh      = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_pvh_guest);
 
         info->shutdown_reason =
             (domctl.u.getdomaininfo.flags>>XEN_DOMINF_shutdownshift) &
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 3578b09..8b55fba 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -422,7 +422,7 @@ typedef struct xc_dominfo {
     uint32_t      ssidref;
     unsigned int  dying:1, crashed:1, shutdown:1,
                   paused:1, blocked:1, running:1,
-                  hvm:1, debugged:1;
+                  hvm:1, debugged:1, pvh:1;
     unsigned int  shutdown_reason; /* only meaningful if shutdown==1 */
     unsigned long nr_pages; /* current number, not maximum */
     unsigned long nr_outstanding_pages;
-- 
1.7.7.5 (Apple Git-26)


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Re: [PATCH v2] libxc: expand cpuid features exposed to PVH guests

[Roger Pau Monné]

On 23/07/14 17:59, Roger Pau Monne wrote:
> Expand the cpuid features exposed to PVH guests, this includes
> exposing PSE, PGE and 1GB pages (which will be masked by the
> hypervisor if not supported by the hardware).
> 
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
> Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
> Cc: Ian Campbell <ian.campbell@citrix.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>

Ping?


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Re: [PATCH v2] libxc: expand cpuid features exposed to PVH guests

[Ian Campbell]

On Fri, 2014-08-01 at 17:28 +0200, Roger Pau Monné wrote:
> On 23/07/14 17:59, Roger Pau Monne wrote:
> > Expand the cpuid features exposed to PVH guests, this includes
> > exposing PSE, PGE and 1GB pages (which will be masked by the
> > hypervisor if not supported by the hardware).
> > 
> > Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> > Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
> > Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
> > Cc: Ian Campbell <ian.campbell@citrix.com>
> > Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> 
> Ping?

Sorry, I'd mentally filed PVH as a hypervisor side thing, despite your
$subject being perfectly clear.

Acked + applied.




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