On Tue, Feb 25, 2025 at 10:00:37PM -0500, Rik van Riel wrote:
> The CPU advertises the maximum number of pages that can be shot down
> with one INVLPGB instruction in the CPUID data.
>
> Save that information for later use.
>
> Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
> Tested-by: Manali Shukla <Manali.Shukla@xxxxxxx>
> Tested-by: Brendan Jackman <jackmanb@xxxxxxxxxx>
> Tested-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
> Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
> ---
> arch/x86/Kconfig.cpu | 4 ++++
> arch/x86/include/asm/cpufeatures.h | 1 +
> arch/x86/include/asm/tlbflush.h | 3 +++
> arch/x86/kernel/cpu/amd.c | 6 ++++++
> 4 files changed, 14 insertions(+)
As discussed, changed ontop.
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
-index 2a7279d80460..981def9cbfac 100644
+index f8b3296fe2e1..63864f5348f2 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
-@@ -401,6 +401,10 @@ menuconfig PROCESSOR_SELECT
+@@ -334,6 +334,10 @@ menuconfig PROCESSOR_SELECT
This lets you choose what x86 vendor support code your kernel
will include.
@@ -37,14 +36,14 @@ index 2a7279d80460..981def9cbfac 100644
default y
bool "Support Intel processors" if PROCESSOR_SELECT
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
-index 508c0dad116b..b5c66b7465ba 100644
+index d5985e8eef29..c0462be0c5f6 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
-@@ -338,6 +338,7 @@
+@@ -330,6 +330,7 @@
#define X86_FEATURE_CLZERO (13*32+ 0) /* "clzero" CLZERO instruction */
#define X86_FEATURE_IRPERF (13*32+ 1) /* "irperf" Instructions Retired Count */
#define X86_FEATURE_XSAVEERPTR (13*32+ 2) /* "xsaveerptr" Always save/restore FP error pointers */
-+#define X86_FEATURE_INVLPGB (13*32+ 3) /* INVLPGB and TLBSYNC instruction supported. */
++#define X86_FEATURE_INVLPGB (13*32+ 3) /* INVLPGB and TLBSYNC instructions supported */
#define X86_FEATURE_RDPRU (13*32+ 4) /* "rdpru" Read processor register at user level */
#define X86_FEATURE_WBNOINVD (13*32+ 9) /* "wbnoinvd" WBNOINVD instruction */
#define X86_FEATURE_AMD_IBPB (13*32+12) /* Indirect Branch Prediction Barrier */
@@ -63,7 +62,7 @@ index 3da645139748..855c13da2045 100644
/*
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
-index 54194f5995de..3c75c174a274 100644
+index d747515ad013..0e2e9af18cef 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -29,6 +29,8 @@
@@ -81,11 +80,11 @@ index 54194f5995de..3c75c174a274 100644
tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;
+
+ /* Max number of pages INVLPGB can invalidate in one shot */
-+ if (boot_cpu_has(X86_FEATURE_INVLPGB))
++ if (cpu_has(c, X86_FEATURE_INVLPGB))
+ invlpgb_count_max = (cpuid_edx(0x80000008) & 0xffff) + 1;
}
static const struct cpu_dev amd_cpu_dev = {
--
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
