On 24/11/2022 13:55, Usama Arif wrote:
On 18/11/2022 00:20, Marc Zyngier wrote:
On Mon, 07 Nov 2022 12:00:44 +,
Usama Arif wrote:
On 06/11/2022 16:35, Marc Zyngier wrote:
On Fri, 04 Nov 2022 06:20:59 +,
Usama Arif wrote:
This patchset adds support for vcpu_is_preempted
On 18/11/2022 00:20, Marc Zyngier wrote:
On Mon, 07 Nov 2022 12:00:44 +,
Usama Arif wrote:
On 06/11/2022 16:35, Marc Zyngier wrote:
On Fri, 04 Nov 2022 06:20:59 +,
Usama Arif wrote:
This patchset adds support for vcpu_is_preempted in arm64, which
allows the guest to check
On 07/11/2022 18:24, Punit Agrawal wrote:
Hi Usama,
Usama Arif writes:
This patchset adds support for vcpu_is_preempted in arm64, which allows the
guest
to check if a vcpu was scheduled out, which is useful to know incase it was
holding a lock. vcpu_is_preempted can be used to improve
On 07/11/2022 18:02, Punit Agrawal wrote:
Usama Arif writes:
Implement the service call for configuring a shared structure between a
VCPU and the hypervisor in which the hypervisor can tell whether the
VCPU is running or not.
The preempted field is zero if the VCPU is not preempted.
Any
On 07/11/2022 17:58, Punit Agrawal wrote:
Usama Arif writes:
Add a new SMCCC compatible hypercalls for PV lock features:
ARM_SMCCC_KVM_FUNC_PV_LOCK: 0xC602
Also add the header file which defines the ABI for the paravirtualized
lock features we're about to add.
Signed-off
On 07/11/2022 17:56, Punit Agrawal wrote:
Hi Usama,
Usama Arif writes:
Introduce a paravirtualization interface for KVM/arm64 to obtain whether
the VCPU is currently running or not.
The PV lock structure of the guest is allocated by user space.
A hypercall interface is provided
On 06/11/2022 16:35, Marc Zyngier wrote:
On Fri, 04 Nov 2022 06:20:59 +,
Usama Arif wrote:
This patchset adds support for vcpu_is_preempted in arm64, which
allows the guest to check if a vcpu was scheduled out, which is
useful to know incase it was holding a lock. vcpu_is_preempted can
On 03/11/2022 13:25, Steven Price wrote:
On 02/11/2022 16:13, Usama Arif wrote:
Support the vcpu_is_preempted() functionality under KVM/arm64. This will
enhance lock performance on overcommitted hosts (more runnable VCPUs
than physical CPUs in the system) as doing busy waits for preempted
This is a vendor specific hypercall.
Signed-off-by: Usama Arif
---
tools/testing/selftests/kvm/aarch64/hypercalls.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/kvm/aarch64/hypercalls.c
b/tools/testing/selftests/kvm/aarch64/hypercalls.c
index a39da3fe4952
-by: Zengruan Ye
Signed-off-by: Usama Arif
---
arch/arm64/include/asm/paravirt.h | 2 +
arch/arm64/include/asm/spinlock.h | 16 -
arch/arm64/kernel/paravirt.c | 112 ++
arch/arm64/kernel/setup.c | 3 +
include/linux/cpuhotplug.h| 1 +
5 files
.
The address is given in terms of the physical address visible to
the guest and must be 64 byte aligned. The guest will discover the
address via a hypercall.
Signed-off-by: Zengruan Ye
Signed-off-by: Usama Arif
---
arch/arm64/include/asm/kvm_host.h | 7
arch/arm64/include/uapi/asm/kvm.h | 2
mu/commit/2da2c2927ae8de8f03f439804a0dad9cf68501b6,
Looking forward to your response!
Thanks,
Usama
---
RFC->v2
- Fixed table and code referencing in pvlock documentation
- Switched to using a single hypercall similar to ptp_kvm and made check
for has_kvm_pvlock simpler
Usama Arif (6):
KVM: arm64: Document PV-lock int
-by: Zengruan Ye
Signed-off-by: Usama Arif
---
Documentation/virt/kvm/arm/hypercalls.rst | 3 ++
arch/arm64/include/asm/kvm_host.h | 18 ++
arch/arm64/include/uapi/asm/kvm.h | 1 +
arch/arm64/kvm/Makefile | 2 +-
arch/arm64/kvm/arm.c | 8
Add a new SMCCC compatible hypercalls for PV lock features:
ARM_SMCCC_KVM_FUNC_PV_LOCK: 0xC602
Also add the header file which defines the ABI for the paravirtualized
lock features we're about to add.
Signed-off-by: Zengruan Ye
Signed-off-by: Usama Arif
---
arch/arm64/include/asm
-by: Zengruan Ye
Signed-off-by: Usama Arif
---
Documentation/virt/kvm/arm/index.rst| 1 +
Documentation/virt/kvm/arm/pvlock.rst | 52 +
Documentation/virt/kvm/devices/vcpu.rst | 25
3 files changed, 78 insertions(+)
create mode 100644 Documentation/virt
arm_smccc_1_1_invoke() which is called later on in the function
will return failure if there's no conduit (or pre-SMCCC 1.1),
hence the check is unnecessary.
Suggested-by: Steven Price
Signed-off-by: Usama Arif
---
arch/arm64/kernel/paravirt.c | 4
1 file changed, 4 deletions(-)
diff
:35PM +, Usama Arif wrote:
+= ==
+Function ID: (uint32)0xC620
+PV_call_id: (uint32)The function to query for support.
+ Currently only PV_LOCK_PREEMPTED is supported.
+Return value: (int64
This includes table format and using reST labels for
cross-referencing to vcpu.rst.
Suggested-by: Bagas Sanjaya
Signed-off-by: Usama Arif
---
Documentation/virt/kvm/arm/pvtime.rst | 14 --
Documentation/virt/kvm/devices/vcpu.rst | 2 ++
2 files changed, 10 insertions(+), 6
These are vendor specific hypercalls.
Signed-off-by: Usama Arif
---
tools/testing/selftests/kvm/aarch64/hypercalls.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/kvm/aarch64/hypercalls.c
b/tools/testing/selftests/kvm/aarch64/hypercalls.c
index a39da3fe4952
-by: Zengruan Ye
Signed-off-by: Usama Arif
---
arch/arm64/include/asm/paravirt.h | 2 +
arch/arm64/include/asm/spinlock.h | 16 +++-
arch/arm64/kernel/paravirt.c | 126 ++
arch/arm64/kernel/setup.c | 3 +
include/linux/cpuhotplug.h| 1 +
5 files
-by: Zengruan Ye
Signed-off-by: Usama Arif
---
Documentation/virt/kvm/arm/hypercalls.rst | 3 ++
arch/arm64/include/asm/kvm_host.h | 18 ++
arch/arm64/include/uapi/asm/kvm.h | 1 +
arch/arm64/kvm/Makefile | 2 +-
arch/arm64/kvm/arm.c | 8
.
The address is given in terms of the physical address visible to
the guest and must be 64 byte aligned. The guest will discover the
address via a hypercall.
Signed-off-by: Zengruan Ye
Signed-off-by: Usama Arif
---
arch/arm64/include/asm/kvm_host.h | 7
arch/arm64/include/uapi/asm/kvm.h | 2
Add two new SMCCC compatible hypercalls for PV lock features:
PV_LOCK_FEATURES: 0xC620
PV_LOCK_PREEMPTED: 0xC621
Also add the header file which defines the ABI for the paravirtualized
lock features we're about to add.
Signed-off-by: Zengruan Ye
Signed-off-by: Usama Arif
e to test this is at
https://github.com/uarif1/qemu/commit/2da2c2927ae8de8f03f439804a0dad9cf68501b6,
if this patchset looks good to start review, I can send the QEMU change to the
qemu mailing list to start its review as well.
Looking forward to your response!
Thanks,
Usama
Usama Arif (6):
KVM: arm64:
and the location of the shared
memory structures.
Signed-off-by: Zengruan Ye
Signed-off-by: Usama Arif
---
Documentation/virt/kvm/arm/pvlock.rst | 64 +
Documentation/virt/kvm/devices/vcpu.rst | 23 +
2 files changed, 87 insertions(+)
create mode 100644 Documentation/virt/kvm
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