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[Qemu-devel] [PULL 4/8] mips: Add KVM T&E segment support for TCG
From: |
Yongbok Kim |
Subject: |
[Qemu-devel] [PULL 4/8] mips: Add KVM T&E segment support for TCG |
Date: |
Thu, 3 Aug 2017 15:45:11 +0100 |
From: James Hogan <address@hidden>
MIPS KVM trap & emulate guest kernels have a different segment layout
compared with traditional MIPS kernels, to allow both the user and
kernel code to run from the user address segment without repeatedly
trapping to KVM.
QEMU currently supports this layout only for KVM, but its sometimes
useful to be able to run these kernels in QEMU on a PC, so enable it for
TCG too.
This also paves the way for MIPS KVM VZ support (which uses the normal
virtual memory layout) by abstracting whether user mode kernel segments
are in use.
Suggested-by: Paolo Bonzini <address@hidden>
Signed-off-by: James Hogan <address@hidden>
Cc: Yongbok Kim <address@hidden>
Cc: Aurelien Jarno <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: address@hidden
Reviewed-by: Richard Henderson <address@hidden>
[Yongbok Kim:
minor change]
Signed-off-by: Yongbok Kim <address@hidden>
---
hw/mips/addr.c | 12 ++++++++++++
hw/mips/mips_malta.c | 19 ++++++++-----------
include/hw/mips/cpudevs.h | 5 +++--
target/mips/helper.c | 4 ++--
target/mips/translate.c | 4 ++--
5 files changed, 27 insertions(+), 17 deletions(-)
diff --git a/hw/mips/addr.c b/hw/mips/addr.c
index e4e86b4..4da46e1 100644
--- a/hw/mips/addr.c
+++ b/hw/mips/addr.c
@@ -24,6 +24,8 @@
#include "hw/hw.h"
#include "hw/mips/cpudevs.h"
+static int mips_um_ksegs;
+
uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr)
{
return addr & 0x1fffffffll;
@@ -38,3 +40,13 @@ uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque,
uint64_t addr)
{
return addr | 0x40000000ll;
}
+
+bool mips_um_ksegs_enabled(void)
+{
+ return mips_um_ksegs;
+}
+
+void mips_um_ksegs_enable(void)
+{
+ mips_um_ksegs = 1;
+}
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 9dcec27..af678f5 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -818,23 +818,20 @@ static int64_t load_kernel (void)
exit(1);
}
- /* Sanity check where the kernel has been linked */
- if (kvm_enabled()) {
- if (kernel_entry & 0x80000000ll) {
+ /* Check where the kernel has been linked */
+ if (kernel_entry & 0x80000000ll) {
+ if (kvm_enabled()) {
error_report("KVM guest kernels must be linked in useg. "
"Did you forget to enable CONFIG_KVM_GUEST?");
exit(1);
}
- xlate_to_kseg0 = cpu_mips_kvm_um_phys_to_kseg0;
- } else {
- if (!(kernel_entry & 0x80000000ll)) {
- error_report("KVM guest kernels aren't supported with TCG. "
- "Did you unintentionally enable CONFIG_KVM_GUEST?");
- exit(1);
- }
-
xlate_to_kseg0 = cpu_mips_phys_to_kseg0;
+ } else {
+ /* if kernel entry is in useg it is probably a KVM T&E kernel */
+ mips_um_ksegs_enable();
+
+ xlate_to_kseg0 = cpu_mips_kvm_um_phys_to_kseg0;
}
/* load initrd */
diff --git a/include/hw/mips/cpudevs.h b/include/hw/mips/cpudevs.h
index 698339b..291f592 100644
--- a/include/hw/mips/cpudevs.h
+++ b/include/hw/mips/cpudevs.h
@@ -5,11 +5,12 @@
/* Definitions for MIPS CPU internal devices. */
-/* mips_addr.c */
+/* addr.c */
uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr);
uint64_t cpu_mips_phys_to_kseg0(void *opaque, uint64_t addr);
uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr);
-
+bool mips_um_ksegs_enabled(void);
+void mips_um_ksegs_enable(void);
/* mips_int.c */
void cpu_mips_irq_init_cpu(MIPSCPU *cpu);
diff --git a/target/mips/helper.c b/target/mips/helper.c
index 05883b9..ca39aca 100644
--- a/target/mips/helper.c
+++ b/target/mips/helper.c
@@ -19,10 +19,10 @@
#include "qemu/osdep.h"
#include "cpu.h"
-#include "sysemu/kvm.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "exec/log.h"
+#include "hw/mips/cpudevs.h"
enum {
TLBRET_XI = -6,
@@ -225,7 +225,7 @@ static int get_physical_address (CPUMIPSState *env, hwaddr
*physical,
#define KVM_KSEG0_BASE ((target_ulong)(int32_t)0x40000000UL)
#define KVM_KSEG2_BASE ((target_ulong)(int32_t)0x60000000UL)
- if (kvm_enabled()) {
+ if (mips_um_ksegs_enabled()) {
/* KVM T&E adds guest kernel segments in useg */
if (real_address >= KVM_KSEG0_BASE) {
if (real_address < KVM_KSEG2_BASE) {
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 0bca700..88f518b 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -27,10 +27,10 @@
#include "exec/exec-all.h"
#include "tcg-op.h"
#include "exec/cpu_ldst.h"
+#include "hw/mips/cpudevs.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
-#include "sysemu/kvm.h"
#include "exec/semihost.h"
#include "target/mips/trace.h"
@@ -20635,7 +20635,7 @@ void cpu_state_reset(CPUMIPSState *env)
env->CP0_Wired = 0;
env->CP0_GlobalNumber = (cs->cpu_index & 0xFF) << CP0GN_VPId;
env->CP0_EBase = (cs->cpu_index & 0x3FF);
- if (kvm_enabled()) {
+ if (mips_um_ksegs_enabled()) {
env->CP0_EBase |= 0x40000000;
} else {
env->CP0_EBase |= (int32_t)0x80000000;
--
2.7.4
- [Qemu-devel] [PULL 0/8] target-mips queue, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 2/8] mips/malta: leave space for the bootmap after the initrd, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 1/8] target-mips: Don't stop on [d]mtc0 DESAVE/KScratch, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 7/8] target/mips: Drop redundant gen_io_start/stop(), Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 5/8] target-mips: apply CP0.PageMask before writing into TLB entry, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 4/8] mips: Add KVM T&E segment support for TCG,
Yongbok Kim <=
- [Qemu-devel] [PULL 3/8] mips: Improve segment defs for KVM T&E guests, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 8/8] target/mips: Fix RDHWR CC with icount, Yongbok Kim, 2017/08/03
- [Qemu-devel] [PULL 6/8] target/mips: Use BS_EXCP where interrupts are expected, Yongbok Kim, 2017/08/03
- Re: [Qemu-devel] [PULL 0/8] target-mips queue, Peter Maydell, 2017/08/04