On 20.03.23 14:17, Jan Beulich wrote:
On 20.03.2023 14:02, Juergen Gross wrote:
On 20.03.23 11:19, Jan Beulich wrote:
On 17.03.2023 14:56, Juergen Gross wrote:
+void __init xen_pv_fix_mitigations(void)
+{
+ if (!xen_vm_assist_ibpb(true))
+ setup_clear_cpu_cap(X86_FEATURE_EN
On 20.03.2023 14:02, Juergen Gross wrote:
> On 20.03.23 11:19, Jan Beulich wrote:
>> On 17.03.2023 14:56, Juergen Gross wrote:
>>> +void __init xen_pv_fix_mitigations(void)
>>> +{
>>> + if (!xen_vm_assist_ibpb(true))
>>> + setup_clear_cpu_cap(X86_FEATURE_ENTRY_IBPB);
>>
>> ... u
On 20.03.23 11:19, Jan Beulich wrote:
On 17.03.2023 14:56, Juergen Gross wrote:
On 15.02.23 09:31, Jan Beulich wrote:
Eventually yes. But I would prefer to sort the above question first
(which I'm sure would have been raised by them, in perhaps more
harsh a way), hence the initially limited exp
On 17.03.2023 15:21, Andrew Cooper wrote:
> On 17/03/2023 1:56 pm, Juergen Gross wrote:
>> --- a/arch/x86/xen/enlighten_pv.c
>> +++ b/arch/x86/xen/enlighten_pv.c
>> @@ -1476,6 +1476,23 @@ static uint32_t __init xen_platform_pv(void)
>> return 0;
>> }
>>
>> +int __init xen_vm_assist_ibpb(bo
On 17.03.2023 14:56, Juergen Gross wrote:
> On 15.02.23 09:31, Jan Beulich wrote:
>> Eventually yes. But I would prefer to sort the above question first
>> (which I'm sure would have been raised by them, in perhaps more
>> harsh a way), hence the initially limited exposure.
>
> I'd rather add _one
On 17.03.23 15:21, Andrew Cooper wrote:
On 17/03/2023 1:56 pm, Juergen Gross wrote:
On 15.02.23 09:31, Jan Beulich wrote:
On 15.02.2023 01:07, Boris Ostrovsky wrote:
On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/a
On 17/03/2023 1:56 pm, Juergen Gross wrote:
> On 15.02.23 09:31, Jan Beulich wrote:
>> On 15.02.2023 01:07, Boris Ostrovsky wrote:
>>>
>>> On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/ke
On 15.02.23 09:31, Jan Beulich wrote:
On 15.02.2023 01:07, Boris Ostrovsky wrote:
On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -18,6 +18,8 @@
#include
#include
+#include
+
On 16.02.2023 00:22, Boris Ostrovsky wrote:
>
> On 2/15/23 3:31 AM, Jan Beulich wrote:
>> On 15.02.2023 01:07, Boris Ostrovsky wrote:
>>> On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/
On 2/15/23 3:31 AM, Jan Beulich wrote:
On 15.02.2023 01:07, Boris Ostrovsky wrote:
On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -18,6 +18,8 @@
#include
#include
+#include
+
On 15.02.2023 01:07, Boris Ostrovsky wrote:
>
> On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
>>
>> On 2/14/23 11:13 AM, Jan Beulich wrote:
>>
>>> --- a/arch/x86/kernel/cpu/bugs.c
>>> +++ b/arch/x86/kernel/cpu/bugs.c
>>> @@ -18,6 +18,8 @@
>>> #include
>>> #include
>>> +#include
>>> +
>>> #
On 2/14/23 6:53 PM, Boris Ostrovsky wrote:
On 2/14/23 11:13 AM, Jan Beulich wrote:
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -18,6 +18,8 @@
#include
#include
+#include
+
#include
#include
#include
@@ -32,6 +34,7 @@
#include
#include
#inclu
On 2/14/23 11:13 AM, Jan Beulich wrote:
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -18,6 +18,8 @@
#include
#include
+#include
+
#include
#include
#include
@@ -32,6 +34,7 @@
#include
#include
#include
+#include
#include
#include "c
If this VM assist is available (to PV guests only), use it to
- avoid issuing an IBPB ourselves upon entry from user mode (which the
hypervisor would then have to emulate, as the MSR write traps),
- suppress the IBPB in the hypervisor if we don't mean to have one
issued.
As there's no good pla
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