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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen stable-4.6] xen/x86: use flag byte for decision whether xen_cr3 is valid
commit 3e3c11b0a0a5d6c579fa1d702f3ae3f61409e4e0
Author: Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Apr 26 13:33:15 2018 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue May 29 11:30:11 2018 +0200
xen/x86: use flag byte for decision whether xen_cr3 is valid
Today cpu_info->xen_cr3 is either 0 to indicate %cr3 doesn't need to
be switched on entry to Xen, or negative for keeping the value while
indicating not to restore %cr3, or positive in case %cr3 is to be
restored.
Switch to use a flag byte instead of a negative xen_cr3 value in order
to allow %cr3 values with the high bit set in case we want to keep TLB
entries when using the PCID feature.
This reduces the number of branches in interrupt handling and results
in better performance (e.g. parallel make of the Xen hypervisor on my
system was using about 3% less system time).
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/domain.c | 1 +
xen/arch/x86/mm.c | 3 +-
xen/arch/x86/smpboot.c | 2 ++
xen/arch/x86/x86_64/asm-offsets.c | 1 +
xen/arch/x86/x86_64/compat/entry.S | 5 ++-
xen/arch/x86/x86_64/entry.S | 63 ++++++++++++++++----------------------
xen/include/asm-x86/current.h | 12 +++++---
7 files changed, 43 insertions(+), 44 deletions(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 91a0e1897c..d0cf15da54 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1671,6 +1671,7 @@ void context_switch(struct vcpu *prev, struct vcpu *next)
ASSERT(local_irq_is_enabled());
+ get_cpu_info()->use_pv_cr3 = 0;
get_cpu_info()->xen_cr3 = 0;
cpumask_copy(&dirty_mask, next->vcpu_dirty_cpumask);
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 303df66174..12f5c6010d 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -503,7 +503,8 @@ void write_ptbase(struct vcpu *v)
}
else
{
- /* Make sure to clear xen_cr3 before pv_cr3. */
+ /* Make sure to clear use_pv_cr3 and xen_cr3 before pv_cr3. */
+ cpu_info->use_pv_cr3 = 0;
cpu_info->xen_cr3 = 0;
/* switch_cr3_cr4() serializes. */
switch_cr3_cr4(v->arch.cr3, new_cr4);
diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 9dfbe1e74d..57ccd0febe 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -356,6 +356,7 @@ void start_secondary(void *unused)
*/
spin_debug_disable();
+ get_cpu_info()->use_pv_cr3 = 0;
get_cpu_info()->xen_cr3 = 0;
get_cpu_info()->pv_cr3 = 0;
@@ -1103,6 +1104,7 @@ void __init smp_prepare_boot_cpu(void)
cpumask_set_cpu(smp_processor_id(), &cpu_online_map);
cpumask_set_cpu(smp_processor_id(), &cpu_present_map);
+ get_cpu_info()->use_pv_cr3 = 0;
get_cpu_info()->xen_cr3 = 0;
get_cpu_info()->pv_cr3 = 0;
}
diff --git a/xen/arch/x86/x86_64/asm-offsets.c
b/xen/arch/x86/x86_64/asm-offsets.c
index b72611f0d2..3c37dab5f0 100644
--- a/xen/arch/x86/x86_64/asm-offsets.c
+++ b/xen/arch/x86/x86_64/asm-offsets.c
@@ -143,6 +143,7 @@ void __dummy__(void)
OFFSET(CPUINFO_xen_spec_ctrl, struct cpu_info, xen_spec_ctrl);
OFFSET(CPUINFO_spec_ctrl_flags, struct cpu_info, spec_ctrl_flags);
OFFSET(CPUINFO_root_pgt_changed, struct cpu_info, root_pgt_changed);
+ OFFSET(CPUINFO_use_pv_cr3, struct cpu_info, use_pv_cr3);
DEFINE(CPUINFO_sizeof, sizeof(struct cpu_info));
BLANK();
diff --git a/xen/arch/x86/x86_64/compat/entry.S
b/xen/arch/x86/x86_64/compat/entry.S
index 6a48fc50b7..3f8fdda535 100644
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -323,10 +323,9 @@ ENTRY(cstar_enter)
GET_STACK_BASE(%rbx)
mov STACK_CPUINFO_FIELD(xen_cr3)(%rbx), %rcx
- neg %rcx
+ test %rcx, %rcx
jz .Lcstar_cr3_okay
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
- neg %rcx
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%rbx)
write_cr3 rcx, rdi, rsi
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
.Lcstar_cr3_okay:
diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index ad2c4b8fa5..f25f9838e2 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -69,6 +69,7 @@ restore_all_guest:
rep movsq
.Lrag_copy_done:
mov %r9, STACK_CPUINFO_FIELD(xen_cr3)(%rdx)
+ movb $1, STACK_CPUINFO_FIELD(use_pv_cr3)(%rdx)
write_cr3 rax, rdi, rsi
.Lrag_keep_cr3:
@@ -147,14 +148,9 @@ restore_all_xen:
* case we return to late PV exit code (from an NMI or #MC).
*/
GET_STACK_BASE(%rbx)
- mov STACK_CPUINFO_FIELD(xen_cr3)(%rbx), %rdx
+ cmpb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%rbx)
+UNLIKELY_START(ne, exit_cr3)
mov STACK_CPUINFO_FIELD(pv_cr3)(%rbx), %rax
- test %rdx, %rdx
- /*
- * Ideally the condition would be "nsz", but such doesn't exist,
- * so "g" will have to do.
- */
-UNLIKELY_START(g, exit_cr3)
write_cr3 rax, rdi, rsi
UNLIKELY_END(exit_cr3)
@@ -196,10 +192,9 @@ ENTRY(lstar_enter)
GET_STACK_BASE(%rbx)
mov STACK_CPUINFO_FIELD(xen_cr3)(%rbx), %rcx
- neg %rcx
+ test %rcx, %rcx
jz .Llstar_cr3_okay
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
- neg %rcx
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%rbx)
write_cr3 rcx, r11, r12
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
.Llstar_cr3_okay:
@@ -375,10 +370,9 @@ GLOBAL(sysenter_eflags_saved)
GET_STACK_BASE(%rbx)
mov STACK_CPUINFO_FIELD(xen_cr3)(%rbx), %rcx
- neg %rcx
+ test %rcx, %rcx
jz .Lsyse_cr3_okay
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
- neg %rcx
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%rbx)
write_cr3 rcx, rdi, rsi
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
.Lsyse_cr3_okay:
@@ -424,10 +418,9 @@ ENTRY(int80_direct_trap)
GET_STACK_BASE(%rbx)
mov STACK_CPUINFO_FIELD(xen_cr3)(%rbx), %rcx
- neg %rcx
+ test %rcx, %rcx
jz .Lint80_cr3_okay
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
- neg %rcx
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%rbx)
write_cr3 rcx, rdi, rsi
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%rbx)
.Lint80_cr3_okay:
@@ -614,24 +607,24 @@ ENTRY(common_interrupt)
/* WARNING! `ret`, `call *`, `jmp *` not safe before this point. */
mov STACK_CPUINFO_FIELD(xen_cr3)(%r14), %rcx
+ mov STACK_CPUINFO_FIELD(use_pv_cr3)(%r14), %bl
mov %rcx, %r15
- neg %rcx
+ test %rcx, %rcx
jz .Lintr_cr3_okay
- jns .Lintr_cr3_load
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
- neg %rcx
-.Lintr_cr3_load:
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
write_cr3 rcx, rdi, rsi
xor %ecx, %ecx
mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
testb $3, UREGS_cs(%rsp)
cmovnz %rcx, %r15
+ cmovnz %rcx, %rbx
.Lintr_cr3_okay:
CR4_PV32_RESTORE
movq %rsp,%rdi
callq do_IRQ
mov %r15, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
+ mov %bl, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
jmp ret_from_intr
/* No special register assumptions. */
@@ -656,18 +649,17 @@ GLOBAL(handle_exception)
/* WARNING! `ret`, `call *`, `jmp *` not safe before this point. */
mov STACK_CPUINFO_FIELD(xen_cr3)(%r14), %rcx
+ mov STACK_CPUINFO_FIELD(use_pv_cr3)(%r14), %r13b
mov %rcx, %r15
- neg %rcx
+ test %rcx, %rcx
jz .Lxcpt_cr3_okay
- jns .Lxcpt_cr3_load
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
- neg %rcx
-.Lxcpt_cr3_load:
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
write_cr3 rcx, rdi, rsi
xor %ecx, %ecx
mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
testb $3, UREGS_cs(%rsp)
cmovnz %rcx, %r15
+ cmovnz %rcx, %r13
.Lxcpt_cr3_okay:
handle_exception_saved:
@@ -736,6 +728,7 @@ handle_exception_saved:
mov (%rdx, %rax, 8), %rdx
INDIRECT_CALL %rdx
mov %r15, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
+ mov %r13b, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
testb $3,UREGS_cs(%rsp)
jz restore_all_xen
movq VCPU_domain(%rbx),%rax
@@ -763,6 +756,7 @@ exception_with_ints_disabled:
1: movq UREGS_error_code(%rsp),%rax # ec/ev
movq %rax,UREGS_kernel_sizeof(%rsp)
mov %r15, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
+ mov %r13b, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
jmp restore_all_xen # return to fixup code
/* No special register assumptions. */
@@ -847,12 +841,9 @@ ENTRY(double_fault)
/* WARNING! `ret`, `call *`, `jmp *` not safe before this point. */
mov STACK_CPUINFO_FIELD(xen_cr3)(%r14), %rbx
- neg %rbx
+ test %rbx, %rbx
jz .Ldblf_cr3_okay
- jns .Ldblf_cr3_load
- mov %rbx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
- neg %rbx
-.Ldblf_cr3_load:
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
write_cr3 rbx, rdi, rsi
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
.Ldblf_cr3_okay:
@@ -882,13 +873,11 @@ handle_ist_exception:
/* WARNING! `ret`, `call *`, `jmp *` not safe before this point. */
mov STACK_CPUINFO_FIELD(xen_cr3)(%r14), %rcx
+ mov STACK_CPUINFO_FIELD(use_pv_cr3)(%r14), %bl
mov %rcx, %r15
- neg %rcx
+ test %rcx, %rcx
jz .List_cr3_okay
- jns .List_cr3_load
- mov %rcx, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
- neg %rcx
-.List_cr3_load:
+ movb $0, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
write_cr3 rcx, rdi, rsi
movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
.List_cr3_okay:
@@ -901,6 +890,7 @@ handle_ist_exception:
* and copy the context to stack bottom.
*/
xor %r15, %r15
+ xor %ebx, %ebx
GET_CPUINFO_FIELD(guest_cpu_user_regs,%rdi)
movq %rsp,%rsi
movl $UREGS_kernel_sizeof/8,%ecx
@@ -912,6 +902,7 @@ handle_ist_exception:
mov (%rdx, %rax, 8), %rdx
INDIRECT_CALL %rdx
mov %r15, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
+ mov %bl, STACK_CPUINFO_FIELD(use_pv_cr3)(%r14)
cmpb $TRAP_nmi,UREGS_entry_vector(%rsp)
jne ret_from_intr
diff --git a/xen/include/asm-x86/current.h b/xen/include/asm-x86/current.h
index c8c89e90f5..4e2ec202c3 100644
--- a/xen/include/asm-x86/current.h
+++ b/xen/include/asm-x86/current.h
@@ -48,10 +48,7 @@ struct cpu_info {
* context is being entered. A value of zero indicates no setting of CR3
* is to be performed.
* The former is the value to restore when re-entering Xen, if any. IOW
- * its value being zero means there's nothing to restore. However, its
- * value can also be negative, indicating to the exit-to-Xen code that
- * restoring is not necessary, but allowing any nested entry code paths
- * to still know the value to put back into CR3.
+ * its value being zero means there's nothing to restore.
*/
unsigned long xen_cr3;
unsigned long pv_cr3;
@@ -69,6 +66,13 @@ struct cpu_info {
*/
bool_t root_pgt_changed;
+ /*
+ * use_pv_cr3 is set in case the value of pv_cr3 is to be written into
+ * CR3 when returning from an interrupt. The main use is when returning
+ * from a NMI or MCE to hypervisor code where pv_cr3 was active.
+ */
+ bool_t use_pv_cr3;
+
unsigned long __pad;
/* get_stack_bottom() must be 16-byte aligned */
};
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.6
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