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Groups > linux.kernel > #1339974
| From | Boris Ostrovsky <boris.ostrovsky@oracle.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH] xen/x86: Zero out .bss for PV guests |
| Date | 2016-02-22 23:10 +0100 |
| Message-ID | <r56Q3-3YI-45@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
Baremetal kernels clear .bss early in the boot. Since Xen PV guests don't excecute that early code they should do it too. (Since we introduce macros for specifying 32- and 64-bit registers we can get rid of ifdefs in startup_xen()) Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> --- arch/x86/xen/xen-head.S | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S index b65f59a..2af87d1 100644 --- a/arch/x86/xen/xen-head.S +++ b/arch/x86/xen/xen-head.S @@ -35,16 +35,31 @@ #define PVH_FEATURES (0) #endif - __INIT -ENTRY(startup_xen) - cld #ifdef CONFIG_X86_32 - mov %esi,xen_start_info - mov $init_thread_union+THREAD_SIZE,%esp +#define REG(register) %e##register +#define WSIZE_SHIFT 2 +#define STOS stosl #else - mov %rsi,xen_start_info - mov $init_thread_union+THREAD_SIZE,%rsp +#define REG(register) %r##register +#define WSIZE_SHIFT 3 +#define STOS stosq #endif + + __INIT +ENTRY(startup_xen) + cld + + /* Clear .bss */ + xor REG(ax),REG(ax) + mov $__bss_start,REG(di) + mov $__bss_stop,REG(cx) + sub REG(di),REG(cx) + shr $WSIZE_SHIFT,REG(cx) + rep STOS + + mov REG(si),xen_start_info + mov $init_thread_union+THREAD_SIZE,REG(sp) + jmp xen_start_kernel __FINIT -- 2.1.0
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[PATCH] xen/x86: Zero out .bss for PV guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-02-22 23:10 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests David Vrabel <david.vrabel@citrix.com> - 2016-02-24 15:20 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests Andrew Cooper <andrew.cooper3@citrix.com> - 2016-02-24 15:20 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-02-24 16:00 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests David Vrabel <david.vrabel@citrix.com> - 2016-02-24 16:00 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-02-24 17:30 +0100
Re: [Xen-devel] [PATCH] xen/x86: Zero out .bss for PV guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-02-24 17:50 +0100
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