From: Toshi Kani <toshi.kani@hpe.com>
To: mingo@kernel.org, bp@suse.de, hpa@zytor.com, tglx@linutronix.de
Cc: jgross@suse.com, Toshi Kani <toshi.kani@hpe.com>,
mcgrof@suse.com, x86@kernel.org, linux-kernel@vger.kernel.org,
paul.gortmaker@windriver.com, xen-devel@lists.xenproject.org,
elliott@hpe.com
Subject: [PATCH v3 1/7] x86/mm/pat: Add support of non-default PAT MSR setting
Date: Wed, 23 Mar 2016 15:41:57 -0600 [thread overview]
Message-ID: <1458769323-24491-2-git-send-email-toshi.kani__7559.83257336101$1458766280$gmane$org@hpe.com> (raw)
In-Reply-To: <1458769323-24491-1-git-send-email-toshi.kani@hpe.com>
In preparation for fixing a regression caused by 'commit 9cd25aac1f44
("x86/mm/pat: Emulate PAT when it is disabled")', PAT needs to
support a case that PAT MSR is initialized with a non-default
value.
When pat_init() is called and PAT is disabled, it initializes
PAT table with the BIOS default value. Xen, however, sets PAT MSR
with a non-default value to enable WC. This causes inconsistency
between PAT table and PAT MSR when PAT is set to disable on Xen.
Change pat_init() to handle the PAT disable cases properly. Add
init_cache_modes() to handle two cases when PAT is set to disable.
1. CPU supports PAT: Set PAT table to be consistent with PAT MSR.
2. CPU does not support PAT: Set PAT table to be consistent with
PWT and PCD bits in a PTE.
Note, __init_cache_modes(), renamed from pat_init_cache_modes(),
will be changed to a static function in a later patch.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/pat.h | 2 +
arch/x86/mm/pat.c | 73 ++++++++++++++++++++++++++++++++------------
arch/x86/xen/enlighten.c | 2 +
3 files changed, 55 insertions(+), 22 deletions(-)
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index ca6c228..97ea55b 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -6,7 +6,7 @@
bool pat_enabled(void);
extern void pat_init(void);
-void pat_init_cache_modes(u64);
+void __init_cache_modes(u64);
extern int reserve_memtype(u64 start, u64 end,
enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 04e2e71..1da55a5 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -181,7 +181,7 @@ static enum page_cache_mode pat_get_cache_mode(unsigned pat_val, char *msg)
* configuration.
* Using lower indices is preferred, so we start with highest index.
*/
-void pat_init_cache_modes(u64 pat)
+void __init_cache_modes(u64 pat)
{
enum page_cache_mode cache;
char pat_msg[33];
@@ -207,9 +207,6 @@ static void pat_bsp_init(u64 pat)
return;
}
- if (!pat_enabled())
- goto done;
-
rdmsrl(MSR_IA32_CR_PAT, tmp_pat);
if (!tmp_pat) {
pat_disable("PAT MSR is 0, disabled.");
@@ -218,15 +215,11 @@ static void pat_bsp_init(u64 pat)
wrmsrl(MSR_IA32_CR_PAT, pat);
-done:
- pat_init_cache_modes(pat);
+ __init_cache_modes(pat);
}
static void pat_ap_init(u64 pat)
{
- if (!pat_enabled())
- return;
-
if (!cpu_has_pat) {
/*
* If this happens we are on a secondary CPU, but switched to
@@ -238,18 +231,32 @@ static void pat_ap_init(u64 pat)
wrmsrl(MSR_IA32_CR_PAT, pat);
}
-void pat_init(void)
+static void init_cache_modes(void)
{
- u64 pat;
- struct cpuinfo_x86 *c = &boot_cpu_data;
+ u64 pat = 0;
+ static int init_cm_done;
- if (!pat_enabled()) {
+ if (init_cm_done)
+ return;
+
+ if (boot_cpu_has(X86_FEATURE_PAT)) {
+ /*
+ * CPU supports PAT. Set PAT table to be consistent with
+ * PAT MSR. This case supports "nopat" boot option, and
+ * virtual machine environments which support PAT without
+ * MTRRs. In specific, Xen has unique setup to PAT MSR.
+ *
+ * If PAT MSR returns 0, it is considered invalid and emulates
+ * as No PAT.
+ */
+ rdmsrl(MSR_IA32_CR_PAT, pat);
+ }
+
+ if (!pat) {
/*
* No PAT. Emulate the PAT table that corresponds to the two
- * cache bits, PWT (Write Through) and PCD (Cache Disable). This
- * setup is the same as the BIOS default setup when the system
- * has PAT but the "nopat" boot option has been specified. This
- * emulated PAT table is used when MSR_IA32_CR_PAT returns 0.
+ * cache bits, PWT (Write Through) and PCD (Cache Disable).
+ * This setup is also the same as the BIOS default setup.
*
* PTE encoding:
*
@@ -266,10 +273,36 @@ void pat_init(void)
*/
pat = PAT(0, WB) | PAT(1, WT) | PAT(2, UC_MINUS) | PAT(3, UC) |
PAT(4, WB) | PAT(5, WT) | PAT(6, UC_MINUS) | PAT(7, UC);
+ }
+
+ __init_cache_modes(pat);
+
+ init_cm_done = 1;
+}
+
+/**
+ * pat_init - Initialize PAT MSR and PAT table
+ *
+ * This function initializes PAT MSR and PAT table with an OS-defined value
+ * to enable additional cache attributes, WC and WT.
+ *
+ * This function must be called on all CPUs using the specific sequence of
+ * operations defined in Intel SDM. mtrr_rendezvous_handler() provides this
+ * procedure for PAT.
+ */
+void pat_init(void)
+{
+ u64 pat;
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ if (!pat_enabled()) {
+ init_cache_modes();
+ return;
+ }
- } else if ((c->x86_vendor == X86_VENDOR_INTEL) &&
- (((c->x86 == 0x6) && (c->x86_model <= 0xd)) ||
- ((c->x86 == 0xf) && (c->x86_model <= 0x6)))) {
+ if ((c->x86_vendor == X86_VENDOR_INTEL) &&
+ (((c->x86 == 0x6) && (c->x86_model <= 0xd)) ||
+ ((c->x86 == 0xf) && (c->x86_model <= 0x6)))) {
/*
* PAT support with the lower four entries. Intel Pentium 2,
* 3, M, and 4 are affected by PAT errata, which makes the
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2379a5a..f4296b6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1623,7 +1623,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
* configuration.
*/
rdmsrl(MSR_IA32_CR_PAT, pat);
- pat_init_cache_modes(pat);
+ __init_cache_modes(pat);
/* keep using Xen gdt for now; no urgent need to change it */
_______________________________________________
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Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next parent reply other threads:[~2016-03-23 20:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1458769323-24491-1-git-send-email-toshi.kani@hpe.com>
2016-03-23 21:41 ` Toshi Kani [this message]
2016-03-23 21:41 ` [PATCH v3 2/7] x86/mm/pat: Add pat_disable() interface Toshi Kani
2016-03-23 21:41 ` [PATCH v3 3/7] x86/mm/pat: Replace cpu_has_pat with boot_cpu_has Toshi Kani
2016-03-23 21:42 ` [PATCH v3 4/6] x86/mtrr: Fix Xorg crashes in Qemu sessions Toshi Kani
2016-03-23 21:42 ` [PATCH v3 5/7] x86/mtrr: Fix PAT init handling when MTRR is disabled Toshi Kani
2016-03-23 21:42 ` [PATCH v3 6/7] x86/xen, pat: Remove PAT table init code from Xen Toshi Kani
2016-03-23 21:42 ` [PATCH v3 7/7] x86/pat: Document PAT initialization Toshi Kani
2016-03-29 10:34 ` [PATCH v3 0/7] Enhance PAT init to fix Xorg crashes Ingo Molnar
[not found] ` <20160329103442.GA12645@gmail.com>
2016-03-29 14:19 ` Toshi Kani
[not found] ` <1459261167.6393.668.camel@hpe.com>
2016-03-29 14:46 ` Boris Ostrovsky
[not found] ` <56FA9563.60401@oracle.com>
2016-03-29 15:49 ` Toshi Kani
[not found] ` <1459266567.6393.669.camel@hpe.com>
2016-03-30 18:02 ` Luis R. Rodriguez
[not found] ` <CAB=NE6VZD3gJicAzm3068APmVeKmFdF-gavNjEoVCz51hV262g@mail.gmail.com>
2016-03-30 18:58 ` Konrad Rzeszutek Wilk
2016-03-30 20:10 ` [LKP] " Luis R. Rodriguez
[not found] ` <CAB=NE6V2BOfkM5B8E+YULqrjqh_QaXOtBgyqpvBoku-73N4X-Q@mail.gmail.com>
2016-03-30 20:29 ` Konrad Rzeszutek Wilk
2016-03-30 20:47 ` Luis R. Rodriguez
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