[Xen-devel] [PATCH v4 3/5] Revert "xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests."

[Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>]

This reverts commit 8d693b911bb9c57009c24cb1772d205b84c7985c.

Instead we use an unified parameter 'nopv' for all the hypervisor
platforms.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
---
 Documentation/admin-guide/kernel-parameters.txt |  4 ----
 arch/x86/xen/enlighten_hvm.c                    | 12 +-----------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt 
b/Documentation/admin-guide/kernel-parameters.txt
index 21e08af..d5c3dcc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5251,10 +5251,6 @@
                        Disables the ticketlock slowpath using Xen PV
                        optimizations.
 
-       xen_nopv        [X86]
-                       Disables the PV optimizations forcing the HVM guest to
-                       run as generic HVM guest with no PV drivers.
-
        xen_scrub_pages=        [XEN]
                        Boolean option to control scrubbing pages before giving 
them back
                        to Xen, for use by other domains. Can be also changed 
at runtime
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index ac4943c..7fcb4ea 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -210,18 +210,8 @@ static void __init xen_hvm_guest_init(void)
 #endif
 }
 
-static bool xen_nopv;
-static __init int xen_parse_nopv(char *arg)
-{
-       xen_nopv = true;
-       return 0;
-}
-early_param("xen_nopv", xen_parse_nopv);
-
 bool __init xen_hvm_need_lapic(void)
 {
-       if (xen_nopv)
-               return false;
        if (xen_pv_domain())
                return false;
        if (!xen_hvm_domain())
@@ -233,7 +223,7 @@ bool __init xen_hvm_need_lapic(void)
 
 static uint32_t __init xen_platform_hvm(void)
 {
-       if (xen_pv_domain() || xen_nopv)
+       if (xen_pv_domain())
                return 0;
 
        return xen_cpuid_base();
-- 
1.8.3.1


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