[PATCH kvm-kmod 0/5] update for 3.20-rc1 (roughly)

[PATCH kvm-kmod 0/5] update for 3.20-rc1 (roughly)

[Paolo Bonzini]

The last patch is still mostly untested.

Paolo Bonzini (5):
  add AVX512 features
  fix missing get_xsave_addr in kernels 3.17-3.18.2
  add CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
  add single_task_running
  tweak replacement for POSTED_INTR_VECTOR

 external-module-compat-comm.h |  6 +++++-
 external-module-compat.c      | 10 +++++++++-
 sync                          | 13 +++++++++----
 x86/external-module-compat.h  | 20 ++++++++++++++++++++
 4 files changed, 43 insertions(+), 6 deletions(-)

-- 
1.8.3.1

[PATCH 1/5] add AVX512 features

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 x86/external-module-compat.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/x86/external-module-compat.h b/x86/external-module-compat.h
index 94cdb45..475643a 100644
--- a/x86/external-module-compat.h
+++ b/x86/external-module-compat.h
@@ -428,6 +428,22 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 #define X86_FEATURE_MPX		(9*32+14) /* Memory Protection Extension */
 #endif
 
+#ifndef X86_FEATURE_AVX512F
+#define X86_FEATURE_AVX512F     (9*32+16) /* AVX-512 Foundation */
+#endif
+
+#ifndef X86_FEATURE_AVX512PF
+#define X86_FEATURE_AVX512PF    (9*32+26) /* AVX-512 Prefetch */
+#endif
+
+#ifndef X86_FEATURE_AVX512ER
+#define X86_FEATURE_AVX512ER    (9*32+27) /* AVX-512 Exponential and Reciprocal */
+#endif
+
+#ifndef X86_FEATURE_AVX512CD
+#define X86_FEATURE_AVX512CD    (9*32+28) /* AVX-512 Conflict Detection */
+#endif
+
 #if X86_FEATURE_XSAVEOPT < 10 * 32
 #undef X86_FEATURE_XSAVEOPT
 #define X86_FEATURE_XSAVEOPT	(10*32+0) /* XSAVEOPT instruction */
-- 
1.8.3.1

[PATCH 2/5] fix missing get_xsave_addr in kernels 3.17-3.18.2

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 external-module-compat-comm.h | 2 +-
 external-module-compat.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
index 66cfde2..d683c30 100644
--- a/external-module-compat-comm.h
+++ b/external-module-compat-comm.h
@@ -1449,7 +1449,7 @@ static inline void pci_set_dev_assigned(struct pci_dev *pdev)
         })
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,3)
 void *get_xsave_addr(struct xsave_struct *xsave, int feature);
 #endif
 
diff --git a/external-module-compat.c b/external-module-compat.c
index 068ab44..347d20e 100644
--- a/external-module-compat.c
+++ b/external-module-compat.c
@@ -363,7 +363,7 @@ u64 kvm_get_boot_base_ns(struct timekeeper *tk)
 #endif
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,3)
 void *get_xsave_addr(struct xsave_struct *xsave, int feature)
 {
 	int index = fls64(feature) - 1;
-- 
1.8.3.1

[PATCH 3/5] add CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 x86/external-module-compat.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/x86/external-module-compat.h b/x86/external-module-compat.h
index 475643a..79f2b76 100644
--- a/x86/external-module-compat.h
+++ b/x86/external-module-compat.h
@@ -51,6 +51,10 @@ static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
 #define CONFIG_HAVE_KVM_EVENTFD 1
 #endif
 
+#ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
+#define CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT 1
+#endif
+
 #ifndef CONFIG_KVM_APIC_ARCHITECTURE
 #define CONFIG_KVM_APIC_ARCHITECTURE
 #endif
-- 
1.8.3.1

[PATCH 4/5] add single_task_running

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 external-module-compat-comm.h | 4 ++++
 external-module-compat.c      | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
index d683c30..456ebf8 100644
--- a/external-module-compat-comm.h
+++ b/external-module-compat-comm.h
@@ -1453,6 +1453,10 @@ static inline void pci_set_dev_assigned(struct pci_dev *pdev)
 void *get_xsave_addr(struct xsave_struct *xsave, int feature);
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+bool single_task_running(void);
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,19,0)
 #define trace_seq_buffer_ptr(p) ((p)->buffer + (p)->len)
 #endif
diff --git a/external-module-compat.c b/external-module-compat.c
index 347d20e..1d9a742 100644
--- a/external-module-compat.c
+++ b/external-module-compat.c
@@ -373,3 +373,11 @@ void *get_xsave_addr(struct xsave_struct *xsave, int feature)
 	return (u8 *)xsave + offset;
 }
 #endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+bool single_task_running(void)
+{
+	/* Not exactly the same... */
+	return !need_resched();
+}
+#endif
-- 
1.8.3.1

[PATCH 5/5] tweak replacement for POSTED_INTR_VECTOR

[Paolo Bonzini]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
	Not tested with APICv!
---
 sync | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/sync b/sync
index 3086b70..36bed39 100755
--- a/sync
+++ b/sync
@@ -341,13 +341,18 @@ def hack_content(fname, data):
         if line == '\tif (!cpu_has_vmx_apicv())':
             w('#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)')
             w(line)
+            w('#else')
+            w('if (1)')
             line = '#endif'
         if line == '#if IS_ENABLED(CONFIG_KVM)':
             line = '#if 1'
-        if line == '\t\tapic->send_IPI_mask(get_cpu_mask(vcpu->cpu),':
-            line = '\t\t;'
-        if line == '\t\t\t\tPOSTED_INTR_VECTOR);':
-            line = ''
+        if match(r'^\t+apic->send_IPI_mask\(get_cpu_mask\(vcpu->cpu\),$'):
+            w('#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)')
+	    w('\t\t;')
+	    w('#else')
+        if match(r'^\t+POSTED_INTR_VECTOR\);$'):
+            w(line)
+            line = '#endif'
         if line == '\tif (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))':
             w('#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)')
             w(line)
-- 
1.8.3.1

Re: [PATCH 4/5] add single_task_running

[Jan Kiszka]

On 2015-02-10 14:14, Paolo Bonzini wrote:
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  external-module-compat-comm.h | 4 ++++
>  external-module-compat.c      | 8 ++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
> index d683c30..456ebf8 100644
> --- a/external-module-compat-comm.h
> +++ b/external-module-compat-comm.h
> @@ -1453,6 +1453,10 @@ static inline void pci_set_dev_assigned(struct pci_dev *pdev)
>  void *get_xsave_addr(struct xsave_struct *xsave, int feature);
>  #endif
>  
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
> +bool single_task_running(void);
> +#endif
> +
>  #if LINUX_VERSION_CODE < KERNEL_VERSION(3,19,0)
>  #define trace_seq_buffer_ptr(p) ((p)->buffer + (p)->len)
>  #endif
> diff --git a/external-module-compat.c b/external-module-compat.c
> index 347d20e..1d9a742 100644
> --- a/external-module-compat.c
> +++ b/external-module-compat.c
> @@ -373,3 +373,11 @@ void *get_xsave_addr(struct xsave_struct *xsave, int feature)
>  	return (u8 *)xsave + offset;
>  }
>  #endif
> +
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
> +bool single_task_running(void)
> +{
> +	/* Not exactly the same... */
> +	return !need_resched();
> +}
> +#endif
> 

3.15 and earlier lacks ktime_before in addition, see e.g.
http://buildbot.kiszka.org/kvm-kmod/builders/3-next/builds/395/steps/3.15-x86-64/logs/stdio

I'm not yet sure where to cut backward support now, maybe 3.10 (LTS).
3.9 gives a strange warning in __do_insn_fetch_bytes though the involved
code should be identical to building for newer kernels:

http://buildbot.kiszka.org/kvm-kmod/builders/3-next/builds/395/steps/3.9-x86-64/logs/stdio

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux

Re: [PATCH 4/5] add single_task_running

[Paolo Bonzini]

On 10/02/2015 17:46, Jan Kiszka wrote:
>> > +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
>> > +bool single_task_running(void)
>> > +{
>> > +	/* Not exactly the same... */
>> > +	return !need_resched();
>> > +}
>> > +#endif
>> > 
> 3.15 and earlier lacks ktime_before in addition, see e.g.
> http://buildbot.kiszka.org/kvm-kmod/builders/3-next/builds/395/steps/3.15-x86-64/logs/stdio

Ah... indeed I tested with 3.16 (that's what I usually use when I'm not
compiling the whole kernel, because RHEL7.1's KVM is based on 3.16).

> I'm not yet sure where to cut backward support now, maybe 3.10 (LTS).

Yeah, either 3.2 or 3.10 I guess.  (Is Debian still using 3.2?)

> 3.9 gives a strange warning in __do_insn_fetch_bytes though the involved
> code should be identical to building for newer kernels:
> 
> http://buildbot.kiszka.org/kvm-kmod/builders/3-next/builds/395/steps/3.9-x86-64/logs/stdio

Weird...

Paolo