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Message-ID: <174617666013.22196.7109101589277660040.tip-bot2@tip-bot2>
Date: Fri, 02 May 2025 09:04:20 -0000
From: "tip-bot2 for Xin Li (Intel)" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "H. Peter Anvin (Intel)" <hpa@...or.com>, Juergen Gross <jgross@...e.com>,
"Xin Li (Intel)" <xin@...or.com>, Ingo Molnar <mingo@...nel.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>, Brian Gerst <brgerst@...il.com>,
David Woodhouse <dwmw2@...radead.org>, Josh Poimboeuf <jpoimboe@...hat.com>,
Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <seanjc@...gle.com>,
Stefano Stabellini <sstabellini@...nel.org>, Uros Bizjak <ubizjak@...il.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/merge] x86/xen/msr: Remove pmu_msr_{read,write}()
The following commit has been merged into the x86/merge branch of tip:
Commit-ID: f7998621db691b6fad4d84ad7d8ecc1a0a9b703f
Gitweb: https://git.kernel.org/tip/f7998621db691b6fad4d84ad7d8ecc1a0a9b703f
Author: Xin Li (Intel) <xin@...or.com>
AuthorDate: Sun, 27 Apr 2025 02:20:23 -07:00
Committer: Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 02 May 2025 10:36:35 +02:00
x86/xen/msr: Remove pmu_msr_{read,write}()
As pmu_msr_{read,write}() are now wrappers of pmu_msr_chk_emulated(),
remove them and use pmu_msr_chk_emulated() directly.
As pmu_msr_chk_emulated() could easily return false in the cases where
it would set *emul to false, remove the "emul" argument and use the
return value instead.
While at it, convert the data type of MSR index to u32 in functions
called in pmu_msr_chk_emulated().
Suggested-by: H. Peter Anvin (Intel) <hpa@...or.com>
Suggested-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Xin Li (Intel) <xin@...or.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Juergen Gross <jgross@...e.com>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Cc: Uros Bizjak <ubizjak@...il.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Link: https://lore.kernel.org/r/20250427092027.1598740-12-xin@zytor.com
---
arch/x86/xen/enlighten_pv.c | 15 ++++++++-------
arch/x86/xen/pmu.c | 33 ++++++++-------------------------
arch/x86/xen/xen-ops.h | 3 +--
3 files changed, 17 insertions(+), 34 deletions(-)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 530b59b..719370d 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1091,7 +1091,7 @@ static u64 xen_do_read_msr(unsigned int msr, int *err)
{
u64 val = 0; /* Avoid uninitialized value for safe variant. */
- if (pmu_msr_read_emulated(msr, &val))
+ if (pmu_msr_chk_emulated(msr, &val, true))
return val;
if (err)
@@ -1163,12 +1163,13 @@ static void xen_do_write_msr(unsigned int msr, unsigned int low,
default:
val = (u64)high << 32 | low;
- if (!pmu_msr_write_emulated(msr, val)) {
- if (err)
- *err = native_write_msr_safe(msr, low, high);
- else
- native_write_msr(msr, low, high);
- }
+ if (pmu_msr_chk_emulated(msr, &val, false))
+ return;
+
+ if (err)
+ *err = native_write_msr_safe(msr, low, high);
+ else
+ native_write_msr(msr, low, high);
}
}
diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
index 0062dbb..043d72b 100644
--- a/arch/x86/xen/pmu.c
+++ b/arch/x86/xen/pmu.c
@@ -129,7 +129,7 @@ static inline uint32_t get_fam15h_addr(u32 addr)
return addr;
}
-static inline bool is_amd_pmu_msr(unsigned int msr)
+static bool is_amd_pmu_msr(u32 msr)
{
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
@@ -195,8 +195,7 @@ static bool is_intel_pmu_msr(u32 msr_index, int *type, int *index)
}
}
-static bool xen_intel_pmu_emulate(unsigned int msr, u64 *val, int type,
- int index, bool is_read)
+static bool xen_intel_pmu_emulate(u32 msr, u64 *val, int type, int index, bool is_read)
{
uint64_t *reg = NULL;
struct xen_pmu_intel_ctxt *ctxt;
@@ -258,7 +257,7 @@ static bool xen_intel_pmu_emulate(unsigned int msr, u64 *val, int type,
return false;
}
-static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, bool is_read)
+static bool xen_amd_pmu_emulate(u32 msr, u64 *val, bool is_read)
{
uint64_t *reg = NULL;
int i, off = 0;
@@ -299,33 +298,17 @@ static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, bool is_read)
return false;
}
-static bool pmu_msr_chk_emulated(unsigned int msr, uint64_t *val, bool is_read,
- bool *emul)
+bool pmu_msr_chk_emulated(u32 msr, u64 *val, bool is_read)
{
int type, index = 0;
if (is_amd_pmu_msr(msr))
- *emul = xen_amd_pmu_emulate(msr, val, is_read);
- else if (is_intel_pmu_msr(msr, &type, &index))
- *emul = xen_intel_pmu_emulate(msr, val, type, index, is_read);
- else
- return false;
-
- return true;
-}
-
-bool pmu_msr_read_emulated(u32 msr, u64 *val)
-{
- bool emulated;
+ return xen_amd_pmu_emulate(msr, val, is_read);
- return pmu_msr_chk_emulated(msr, val, true, &emulated) && emulated;
-}
+ if (is_intel_pmu_msr(msr, &type, &index))
+ return xen_intel_pmu_emulate(msr, val, type, index, is_read);
-bool pmu_msr_write_emulated(u32 msr, u64 val)
-{
- bool emulated;
-
- return pmu_msr_chk_emulated(msr, &val, false, &emulated) && emulated;
+ return false;
}
static u64 xen_amd_read_pmc(int counter)
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 2de3061..090349b 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -271,8 +271,7 @@ void xen_pmu_finish(int cpu);
static inline void xen_pmu_init(int cpu) {}
static inline void xen_pmu_finish(int cpu) {}
#endif
-bool pmu_msr_read_emulated(u32 msr, u64 *val);
-bool pmu_msr_write_emulated(u32 msr, u64 val);
+bool pmu_msr_chk_emulated(u32 msr, u64 *val, bool is_read);
int pmu_apic_update(uint32_t reg);
u64 xen_read_pmc(int counter);
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