Displaying 16 results from an estimated 16 matches for "kvm_hints_realtim".
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kvm_hints_realtime
2019 May 27
3
[RFC PATCH 5/6] x86/mm/tlb: Flush remote and local TLBs concurrently
...onst s
}
}
- native_flush_tlb_others(flushmask, info);
+ native_flush_tlb_multi(flushmask, info);
}
static void __init kvm_guest_init(void)
@@ -628,9 +631,8 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
- pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
- static_key_disable(&flush_tlb_multi_enabled.key);
}
if (kvm_...
2019 May 27
3
[RFC PATCH 5/6] x86/mm/tlb: Flush remote and local TLBs concurrently
...onst s
}
}
- native_flush_tlb_others(flushmask, info);
+ native_flush_tlb_multi(flushmask, info);
}
static void __init kvm_guest_init(void)
@@ -628,9 +631,8 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
- pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
- static_key_disable(&flush_tlb_multi_enabled.key);
}
if (kvm_...
2019 May 27
0
[RFC PATCH 5/6] x86/mm/tlb: Flush remote and local TLBs concurrently
...b_others(flushmask, info);
> + native_flush_tlb_multi(flushmask, info);
> }
>
> static void __init kvm_guest_init(void)
> @@ -628,9 +631,8 @@ static void __init kvm_guest_init(void)
> if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
> !kvm_para_has_hint(KVM_HINTS_REALTIME) &&
> kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
> - pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
> + pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
> pv_ops.mmu.tlb_remove_table = tlb_remove_table;
> - static_key_disable(&flush_tlb_multi_enabl...
2020 Apr 08
0
[RFC PATCH 00/26] Runtime paravirt patching
Ankur Arora <ankur.a.arora at oracle.com> writes:
> A KVM host (or another hypervisor) might advertise paravirtualized
> features and optimization hints (ex KVM_HINTS_REALTIME) which might
> become stale over the lifetime of the guest. For instance, the
> host might go from being undersubscribed to being oversubscribed
> (or the other way round) and it would make sense for the guest
> switch pv-ops based on that.
If your host changes his advertised behaviou...
2020 Apr 08
2
[RFC PATCH 00/26] Runtime paravirt patching
On Tue, Apr 07, 2020 at 10:02:57PM -0700, Ankur Arora wrote:
> A KVM host (or another hypervisor) might advertise paravirtualized
> features and optimization hints (ex KVM_HINTS_REALTIME) which might
> become stale over the lifetime of the guest. For instance, the
> host might go from being undersubscribed to being oversubscribed
> (or the other way round) and it would make sense for the guest
> switch pv-ops based on that.
So what, the paravirt spinlock stuff works j...
2020 Apr 08
2
[RFC PATCH 00/26] Runtime paravirt patching
On Tue, Apr 07, 2020 at 10:02:57PM -0700, Ankur Arora wrote:
> A KVM host (or another hypervisor) might advertise paravirtualized
> features and optimization hints (ex KVM_HINTS_REALTIME) which might
> become stale over the lifetime of the guest. For instance, the
> host might go from being undersubscribed to being oversubscribed
> (or the other way round) and it would make sense for the guest
> switch pv-ops based on that.
So what, the paravirt spinlock stuff works j...
2020 Apr 08
0
[RFC PATCH 00/26] Runtime paravirt patching
On 08.04.20 07:02, Ankur Arora wrote:
> A KVM host (or another hypervisor) might advertise paravirtualized
> features and optimization hints (ex KVM_HINTS_REALTIME) which might
> become stale over the lifetime of the guest. For instance, the
Then this hint is wrong if it can't be guaranteed.
> host might go from being undersubscribed to being oversubscribed
> (or the other way round) and it would make sense for the guest
> switch pv-ops bas...
2019 Jul 19
0
[PATCH v3 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently
...umask,
}
}
- native_flush_tlb_others(flushmask, info);
+ native_flush_tlb_multi(flushmask, info);
}
static void __init kvm_guest_init(void)
@@ -643,7 +648,7 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
- pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
}
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt....
2019 Jul 02
0
[PATCH v2 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently
...umask,
}
}
- native_flush_tlb_others(flushmask, info);
+ native_flush_tlb_multi(flushmask, info);
}
static void __init kvm_guest_init(void)
@@ -628,7 +633,7 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
- pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
}
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt....
2019 May 25
3
[RFC PATCH 5/6] x86/mm/tlb: Flush remote and local TLBs concurrently
To improve TLB shootdown performance, flush the remote and local TLBs
concurrently. Introduce flush_tlb_multi() that does so. The current
flush_tlb_others() interface is kept, since paravirtual interfaces need
to be adapted first before it can be removed. This is left for future
work. In such PV environments, TLB flushes are not performed, at this
time, concurrently.
Add a static key to tell
2019 May 25
3
[RFC PATCH 5/6] x86/mm/tlb: Flush remote and local TLBs concurrently
To improve TLB shootdown performance, flush the remote and local TLBs
concurrently. Introduce flush_tlb_multi() that does so. The current
flush_tlb_others() interface is kept, since paravirtual interfaces need
to be adapted first before it can be removed. This is left for future
work. In such PV environments, TLB flushes are not performed, at this
time, concurrently.
Add a static key to tell
2019 Jul 02
2
[PATCH v2 0/9] x86: Concurrent TLB flushes
Currently, local and remote TLB flushes are not performed concurrently,
which introduces unnecessary overhead - each INVLPG can take 100s of
cycles. This patch-set allows TLB flushes to be run concurrently: first
request the remote CPUs to initiate the flush, then run it locally, and
finally wait for the remote CPUs to finish their work.
In addition, there are various small optimizations to avoid
2018 Aug 10
0
[PATCH 04/10] x86/paravirt: use a single ops structure
...init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
has_steal_clock = 1;
- pv_time_ops.steal_clock = kvm_steal_clock;
+ pv_ops.pv_time_ops.steal_clock = kvm_steal_clock;
}
if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME))
- pv_mmu_ops.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.pv_mmu_ops.flush_tlb_others = kvm_flush_tlb_others;
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
apic_set_eoi_write(kvm_guest_apic_eoi_write);
@@ -749,13 +749,15...
2019 Jul 19
5
[PATCH v3 0/9] x86: Concurrent TLB flushes
[ Cover-letter is identical to v2, including benchmark results,
excluding the change log. ]
Currently, local and remote TLB flushes are not performed concurrently,
which introduces unnecessary overhead - each INVLPG can take 100s of
cycles. This patch-set allows TLB flushes to be run concurrently: first
request the remote CPUs to initiate the flush, then run it locally, and
finally wait for
2018 Aug 10
13
[PATCH 00/10] x86/paravirt: several cleanups
This series removes some no longer needed stuff from paravirt
infrastructure and puts large quantities of paravirt ops under a new
config option PARAVIRT_XXL which is selected by XEN_PV only.
A pvops kernel without XEN_PV being configured is about 2.5% smaller
with this series applied.
tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt:
Fix spectre-v2 mitigations for
2018 Aug 13
11
[PATCH v2 00/11] x86/paravirt: several cleanups
This series removes some no longer needed stuff from paravirt
infrastructure and puts large quantities of paravirt ops under a new
config option PARAVIRT_XXL which is selected by XEN_PV only.
A pvops kernel without XEN_PV being configured is about 2.5% smaller
with this series applied.
tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt:
Fix spectre-v2 mitigations for