On 5/29/2019 10:38 AM, Paolo Bonzini wrote:
On 29/05/19 04:05, Tao Xu wrote:
Thank you Paolo, but I have another question. I was wondering if it is
appropriate to enable X86_FEATURE_WAITPKG when QEMU uses "-overcommit
cpu-pm=on"?
"-overcommit" only establishes the
On 29/05/2019 09:28, Paolo Bonzini wrote:
On 24/05/19 09:56, Tao Xu wrote:
As the latest Intel 64 and IA-32 Architectures Software Developer's
Manual, UMWAIT and TPAUSE instructions cause a VM exit if the
“RDTSC exiting” and “enable user wait and pause” VM-execution controls
are both 1.
On 29/05/2019 09:24, Paolo Bonzini wrote:
On 24/05/19 09:56, Tao Xu wrote:
+7.19 KVM_CAP_ENABLE_USR_WAIT_PAUSE
+
+Architectures: x86
+Parameters: args[0] whether feature should be enabled or not
+
+With this capability enabled, a VM can use UMONITOR, UMWAIT and TPAUSE
+instructions. If the
On 29/05/2019 09:29, Paolo Bonzini wrote:
On 24/05/19 09:56, Tao Xu wrote:
+
+ if (rdmsrl_safe(MSR_IA32_UMWAIT_CONTROL, &host_umwait_control))
+ return;
+
Does the host value ever change? If not, this can perhaps be read once
when kvm_intel is loaded. And if it cha
On 28/05/2019 14:11, Wanpeng Li wrote:
On Tue, 28 May 2019 at 13:16, Tao Xu wrote:
On 27/05/2019 18:30, Peter Zijlstra wrote:
On Fri, May 24, 2019 at 03:56:35PM +0800, Tao Xu wrote:
This patch adds support for UMONITOR, UMWAIT and TPAUSE instructions
in kvm, and by default dont't e
On 27/05/2019 18:30, Peter Zijlstra wrote:
On Fri, May 24, 2019 at 03:56:35PM +0800, Tao Xu wrote:
This patch adds support for UMONITOR, UMWAIT and TPAUSE instructions
in kvm, and by default dont't expose it to kvm and provide a capability
to enable it.
I'm thinking this
This patch adds support for UMONITOR, UMWAIT and TPAUSE instructions
in kvm, and by default dont't expose it to kvm and provide a capability
to enable it.
Co-developed-by: Jingqi Liu
Signed-off-by: Jingqi Liu
Signed-off-by: Tao Xu
---
Documentation/virtual/kvm/api.txt | 12
.
Co-developed-by: Jingqi Liu
Signed-off-by: Jingqi Liu
Signed-off-by: Tao Xu
---
arch/x86/include/uapi/asm/vmx.h | 6 +-
arch/x86/kvm/vmx/vmx.c | 16
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uap
NITOR, UMWAIT and TPAUSE
v1:
Sent out with MOVDIRI/MOVDIR64B instructions patches
Tao Xu (3):
KVM: x86: add support for user wait instructions
KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL
KVM: vmx: handle vm-exit for UMWAIT and TPAUSE
Documentation/virtual/kvm/api.txt | 12 ++
arc
-by: Jingqi Liu
Signed-off-by: Jingqi Liu
Signed-off-by: Tao Xu
---
arch/x86/kvm/vmx/vmx.c | 42 ++
arch/x86/kvm/vmx/vmx.h | 1 +
arch/x86/kvm/x86.c | 1 +
3 files changed, 44 insertions(+)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx
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