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Date: Wed, 28 Jan 2009 14:35:07 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Xen-devel <xen-devel@...ts.xensource.com>,
the arch/x86 maintainers <x86@...nel.org>,
Ian Campbell <ian.campbell@...rix.com>,
Zachary Amsden <zach@...are.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Ravikiran Thirumalai <kiran@...lemp.com>
Subject: [PATCH 7 of 7] x86/paravirt: use callee-saved convention for
pte_val/make_pte/etc
In the native case, pte_val, make_pte, etc are all just identity
functions, so there's no need to clobber a lot of registers over them.
(This changes the 32-bit callee-save calling convention to return both
EAX and EDX so functions can return 64-bit values.)
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
arch/x86/include/asm/paravirt.h | 78 +++++++++++++++++++--------------------
arch/x86/kernel/paravirt.c | 53 ++++++--------------------
arch/x86/xen/mmu.c | 24 ++++++++----
3 files changed, 67 insertions(+), 88 deletions(-)
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -19,7 +19,7 @@
#define CLBR_ANY ((1 << 4) - 1)
#define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
-#define CLBR_RET_REG (CLBR_EAX)
+#define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
#define CLBR_SCRATCH (0)
#else
#define CLBR_RAX CLBR_EAX
@@ -308,11 +308,11 @@
void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
- pteval_t (*pte_val)(pte_t);
- pte_t (*make_pte)(pteval_t pte);
+ struct paravirt_callee_save pte_val;
+ struct paravirt_callee_save make_pte;
- pgdval_t (*pgd_val)(pgd_t);
- pgd_t (*make_pgd)(pgdval_t pgd);
+ struct paravirt_callee_save pgd_val;
+ struct paravirt_callee_save make_pgd;
#if PAGETABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
@@ -327,12 +327,12 @@
void (*set_pud)(pud_t *pudp, pud_t pudval);
- pmdval_t (*pmd_val)(pmd_t);
- pmd_t (*make_pmd)(pmdval_t pmd);
+ struct paravirt_callee_save pmd_val;
+ struct paravirt_callee_save make_pmd;
#if PAGETABLE_LEVELS == 4
- pudval_t (*pud_val)(pud_t);
- pud_t (*make_pud)(pudval_t pud);
+ struct paravirt_callee_save pud_val;
+ struct paravirt_callee_save make_pud;
void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
#endif /* PAGETABLE_LEVELS == 4 */
@@ -1155,13 +1155,13 @@
pteval_t ret;
if (sizeof(pteval_t) > sizeof(long))
- ret = PVOP_CALL2(pteval_t,
- pv_mmu_ops.make_pte,
- val, (u64)val >> 32);
+ ret = PVOP_CALLEE2(pteval_t,
+ pv_mmu_ops.make_pte,
+ val, (u64)val >> 32);
else
- ret = PVOP_CALL1(pteval_t,
- pv_mmu_ops.make_pte,
- val);
+ ret = PVOP_CALLEE1(pteval_t,
+ pv_mmu_ops.make_pte,
+ val);
return (pte_t) { .pte = ret };
}
@@ -1171,11 +1171,11 @@
pteval_t ret;
if (sizeof(pteval_t) > sizeof(long))
- ret = PVOP_CALL2(pteval_t, pv_mmu_ops.pte_val,
- pte.pte, (u64)pte.pte >> 32);
+ ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
+ pte.pte, (u64)pte.pte >> 32);
else
- ret = PVOP_CALL1(pteval_t, pv_mmu_ops.pte_val,
- pte.pte);
+ ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
+ pte.pte);
return ret;
}
@@ -1185,11 +1185,11 @@
pgdval_t ret;
if (sizeof(pgdval_t) > sizeof(long))
- ret = PVOP_CALL2(pgdval_t, pv_mmu_ops.make_pgd,
- val, (u64)val >> 32);
+ ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
+ val, (u64)val >> 32);
else
- ret = PVOP_CALL1(pgdval_t, pv_mmu_ops.make_pgd,
- val);
+ ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
+ val);
return (pgd_t) { ret };
}
@@ -1199,11 +1199,11 @@
pgdval_t ret;
if (sizeof(pgdval_t) > sizeof(long))
- ret = PVOP_CALL2(pgdval_t, pv_mmu_ops.pgd_val,
- pgd.pgd, (u64)pgd.pgd >> 32);
+ ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
+ pgd.pgd, (u64)pgd.pgd >> 32);
else
- ret = PVOP_CALL1(pgdval_t, pv_mmu_ops.pgd_val,
- pgd.pgd);
+ ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
+ pgd.pgd);
return ret;
}
@@ -1267,11 +1267,11 @@
pmdval_t ret;
if (sizeof(pmdval_t) > sizeof(long))
- ret = PVOP_CALL2(pmdval_t, pv_mmu_ops.make_pmd,
- val, (u64)val >> 32);
+ ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
+ val, (u64)val >> 32);
else
- ret = PVOP_CALL1(pmdval_t, pv_mmu_ops.make_pmd,
- val);
+ ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
+ val);
return (pmd_t) { ret };
}
@@ -1281,11 +1281,11 @@
pmdval_t ret;
if (sizeof(pmdval_t) > sizeof(long))
- ret = PVOP_CALL2(pmdval_t, pv_mmu_ops.pmd_val,
- pmd.pmd, (u64)pmd.pmd >> 32);
+ ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
+ pmd.pmd, (u64)pmd.pmd >> 32);
else
- ret = PVOP_CALL1(pmdval_t, pv_mmu_ops.pmd_val,
- pmd.pmd);
+ ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
+ pmd.pmd);
return ret;
}
@@ -1307,11 +1307,11 @@
pudval_t ret;
if (sizeof(pudval_t) > sizeof(long))
- ret = PVOP_CALL2(pudval_t, pv_mmu_ops.make_pud,
- val, (u64)val >> 32);
+ ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
+ val, (u64)val >> 32);
else
- ret = PVOP_CALL1(pudval_t, pv_mmu_ops.make_pud,
- val);
+ ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
+ val);
return (pud_t) { ret };
}
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -391,43 +391,12 @@
#endif
};
-typedef pte_t make_pte_t(pteval_t);
-typedef pmd_t make_pmd_t(pmdval_t);
-typedef pud_t make_pud_t(pudval_t);
-typedef pgd_t make_pgd_t(pgdval_t);
-
-typedef pteval_t pte_val_t(pte_t);
-typedef pmdval_t pmd_val_t(pmd_t);
-typedef pudval_t pud_val_t(pud_t);
-typedef pgdval_t pgd_val_t(pgd_t);
-
-
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
/* 32-bit pagetable entries */
-#define paravirt_native_make_pte (make_pte_t *)_paravirt_ident_32
-#define paravirt_native_pte_val (pte_val_t *)_paravirt_ident_32
-
-#define paravirt_native_make_pmd (make_pmd_t *)_paravirt_ident_32
-#define paravirt_native_pmd_val (pmd_val_t *)_paravirt_ident_32
-
-#define paravirt_native_make_pud (make_pud_t *)_paravirt_ident_32
-#define paravirt_native_pud_val (pud_val_t *)_paravirt_ident_32
-
-#define paravirt_native_make_pgd (make_pgd_t *)_paravirt_ident_32
-#define paravirt_native_pgd_val (pgd_val_t *)_paravirt_ident_32
+#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_32)
#else
/* 64-bit pagetable entries */
-#define paravirt_native_make_pte (make_pte_t *)_paravirt_ident_64
-#define paravirt_native_pte_val (pte_val_t *)_paravirt_ident_64
-
-#define paravirt_native_make_pmd (make_pmd_t *)_paravirt_ident_64
-#define paravirt_native_pmd_val (pmd_val_t *)_paravirt_ident_64
-
-#define paravirt_native_make_pud (make_pud_t *)_paravirt_ident_64
-#define paravirt_native_pud_val (pud_val_t *)_paravirt_ident_64
-
-#define paravirt_native_make_pgd (make_pgd_t *)_paravirt_ident_64
-#define paravirt_native_pgd_val (pgd_val_t *)_paravirt_ident_64
+#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
#endif
struct pv_mmu_ops pv_mmu_ops = {
@@ -481,21 +450,23 @@
.pmd_clear = native_pmd_clear,
#endif
.set_pud = native_set_pud,
- .pmd_val = paravirt_native_pmd_val,
- .make_pmd = paravirt_native_make_pmd,
+
+ .pmd_val = PTE_IDENT,
+ .make_pmd = PTE_IDENT,
#if PAGETABLE_LEVELS == 4
- .pud_val = paravirt_native_pud_val,
- .make_pud = paravirt_native_make_pud,
+ .pud_val = PTE_IDENT,
+ .make_pud = PTE_IDENT,
+
.set_pgd = native_set_pgd,
#endif
#endif /* PAGETABLE_LEVELS >= 3 */
- .pte_val = paravirt_native_pte_val,
- .pgd_val = paravirt_native_pgd_val,
+ .pte_val = PTE_IDENT,
+ .pgd_val = PTE_IDENT,
- .make_pte = paravirt_native_make_pte,
- .make_pgd = paravirt_native_make_pgd,
+ .make_pte = PTE_IDENT,
+ .make_pgd = PTE_IDENT,
.dup_mmap = paravirt_nop,
.exit_mmap = paravirt_nop,
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -492,28 +492,33 @@
{
return pte_mfn_to_pfn(pte.pte);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
pgdval_t xen_pgd_val(pgd_t pgd)
{
return pte_mfn_to_pfn(pgd.pgd);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
pte_t xen_make_pte(pteval_t pte)
{
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
pgd_t xen_make_pgd(pgdval_t pgd)
{
pgd = pte_pfn_to_mfn(pgd);
return native_make_pgd(pgd);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
pmdval_t xen_pmd_val(pmd_t pmd)
{
return pte_mfn_to_pfn(pmd.pmd);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
void xen_set_pud_hyper(pud_t *ptr, pud_t val)
{
@@ -590,12 +595,14 @@
pmd = pte_pfn_to_mfn(pmd);
return native_make_pmd(pmd);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
#if PAGETABLE_LEVELS == 4
pudval_t xen_pud_val(pud_t pud)
{
return pte_mfn_to_pfn(pud.pud);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
pud_t xen_make_pud(pudval_t pud)
{
@@ -603,6 +610,7 @@
return native_make_pud(pud);
}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
pgd_t *xen_get_user_pgd(pgd_t *pgd)
{
@@ -1813,11 +1821,11 @@
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
- .pte_val = xen_pte_val,
- .pgd_val = xen_pgd_val,
+ .pte_val = PV_CALLEE_SAVE(xen_pte_val),
+ .pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
- .make_pte = xen_make_pte,
- .make_pgd = xen_make_pgd,
+ .make_pte = PV_CALLEE_SAVE(xen_make_pte),
+ .make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
#ifdef CONFIG_X86_PAE
.set_pte_atomic = xen_set_pte_atomic,
@@ -1827,12 +1835,12 @@
#endif /* CONFIG_X86_PAE */
.set_pud = xen_set_pud_hyper,
- .make_pmd = xen_make_pmd,
- .pmd_val = xen_pmd_val,
+ .make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
+ .pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
#if PAGETABLE_LEVELS == 4
- .pud_val = xen_pud_val,
- .make_pud = xen_make_pud,
+ .pud_val = PV_CALLEE_SAVE(xen_pud_val),
+ .make_pud = PV_CALLEE_SAVE(xen_make_pud),
.set_pgd = xen_set_pgd_hyper,
.alloc_pud = xen_alloc_pte_init,
--
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