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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V2 18/40] arm: context switch a bunch of guest state.
I haven't investigated what if any of this could be done lazily.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
xen/arch/arm/domain.c | 122 +++++++++++++++++++++++++++++++++++++++--
xen/arch/arm/gic.c | 25 ++++++++-
xen/arch/arm/gic.h | 9 ++-
xen/include/asm-arm/cpregs.h | 29 +++++++++-
xen/include/asm-arm/domain.h | 33 ++++++++++-
xen/include/public/arch-arm.h | 3 +
6 files changed, 208 insertions(+), 13 deletions(-)
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 931261b..d11be78 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -36,12 +36,124 @@ void idle_loop(void)
static void ctxt_switch_from(struct vcpu *p)
{
+ /* CP 15 */
+ p->arch.csselr = READ_CP32(CSSELR);
+
+ /* Control Registers */
+ p->arch.actlr = READ_CP32(ACTLR);
+ p->arch.sctlr = READ_CP32(SCTLR);
+ p->arch.cpacr = READ_CP32(CPACR);
+
+ p->arch.contextidr = READ_CP32(CONTEXTIDR);
+ p->arch.tpidrurw = READ_CP32(TPIDRURW);
+ p->arch.tpidruro = READ_CP32(TPIDRURO);
+ p->arch.tpidrprw = READ_CP32(TPIDRPRW);
+
+ /* XXX only save these if ThumbEE e.g. ID_PFR0.THUMB_EE_SUPPORT */
+ p->arch.teecr = READ_CP32(TEECR);
+ p->arch.teehbr = READ_CP32(TEEHBR);
+
+ p->arch.joscr = READ_CP32(JOSCR);
+ p->arch.jmcr = READ_CP32(JMCR);
+
+ isb();
+
+ /* MMU */
+ p->arch.vbar = READ_CP32(VBAR);
+ p->arch.ttbcr = READ_CP32(TTBCR);
+ /* XXX save 64 bit TTBR if guest is LPAE */
+ p->arch.ttbr0 = READ_CP32(TTBR0);
+ p->arch.ttbr1 = READ_CP32(TTBR1);
+
+ p->arch.dacr = READ_CP32(DACR);
+ p->arch.par = READ_CP64(PAR);
+ p->arch.mair0 = READ_CP32(MAIR0);
+ p->arch.mair1 = READ_CP32(MAIR1);
+
+ /* Fault Status */
+ p->arch.dfar = READ_CP32(DFAR);
+ p->arch.ifar = READ_CP32(IFAR);
+ p->arch.dfsr = READ_CP32(DFSR);
+ p->arch.ifsr = READ_CP32(IFSR);
+ p->arch.adfsr = READ_CP32(ADFSR);
+ p->arch.aifsr = READ_CP32(AIFSR);
+
+ /* XXX MPU */
+
+ /* XXX VFP */
+
+ /* XXX VGIC */
+ gic_save_state(p);
+
+ isb();
context_saved(p);
}
static void ctxt_switch_to(struct vcpu *n)
{
+ uint32_t hcr;
+
+ hcr = READ_CP32(HCR);
+ WRITE_CP32(hcr & ~HCR_VM, HCR);
+ isb();
+
p2m_load_VTTBR(n->domain);
+ isb();
+
+ /* XXX VGIC */
+ gic_restore_state(n);
+
+ /* XXX VFP */
+
+ /* XXX MPU */
+
+ /* Fault Status */
+ WRITE_CP32(n->arch.dfar, DFAR);
+ WRITE_CP32(n->arch.ifar, IFAR);
+ WRITE_CP32(n->arch.dfsr, DFSR);
+ WRITE_CP32(n->arch.ifsr, IFSR);
+ WRITE_CP32(n->arch.adfsr, ADFSR);
+ WRITE_CP32(n->arch.aifsr, AIFSR);
+
+ /* MMU */
+ WRITE_CP32(n->arch.vbar, VBAR);
+ WRITE_CP32(n->arch.ttbcr, TTBCR);
+ /* XXX restore 64 bit TTBR if guest is LPAE */
+ WRITE_CP32(n->arch.ttbr0, TTBR0);
+ WRITE_CP32(n->arch.ttbr1, TTBR1);
+
+ WRITE_CP32(n->arch.dacr, DACR);
+ WRITE_CP64(n->arch.par, PAR);
+ WRITE_CP32(n->arch.mair0, MAIR0);
+ WRITE_CP32(n->arch.mair1, MAIR1);
+ isb();
+
+ /* Control Registers */
+ WRITE_CP32(n->arch.actlr, ACTLR);
+ WRITE_CP32(n->arch.sctlr, SCTLR);
+ WRITE_CP32(n->arch.cpacr, CPACR);
+
+ WRITE_CP32(n->arch.contextidr, CONTEXTIDR);
+ WRITE_CP32(n->arch.tpidrurw, TPIDRURW);
+ WRITE_CP32(n->arch.tpidruro, TPIDRURO);
+ WRITE_CP32(n->arch.tpidrprw, TPIDRPRW);
+
+ /* XXX only restore these if ThumbEE e.g. ID_PFR0.THUMB_EE_SUPPORT */
+ WRITE_CP32(n->arch.teecr, TEECR);
+ WRITE_CP32(n->arch.teehbr, TEEHBR);
+
+ WRITE_CP32(n->arch.joscr, JOSCR);
+ WRITE_CP32(n->arch.jmcr, JMCR);
+
+ isb();
+
+ /* CP 15 */
+ WRITE_CP32(n->arch.csselr, CSSELR);
+
+ isb();
+
+ WRITE_CP32(hcr, HCR);
+ isb();
}
static void schedule_tail(struct vcpu *prev)
@@ -258,6 +370,7 @@ static int is_guest_psr(uint32_t psr)
int arch_set_info_guest(
struct vcpu *v, vcpu_guest_context_u c)
{
+ struct vcpu_guest_context *ctxt = c.nat;
struct cpu_user_regs *regs = &c.nat->user_regs;
if ( !is_guest_psr(regs->cpsr) )
@@ -276,11 +389,10 @@ int arch_set_info_guest(
v->arch.cpu_info->guest_cpu_user_regs = *regs;
- /* XXX other state:
- * - SCTLR
- * - TTBR0/1
- * - TTBCR
- */
+ v->arch.sctlr = ctxt->sctlr;
+ v->arch.ttbr0 = ctxt->ttbr0;
+ v->arch.ttbr1 = ctxt->ttbr1;
+ v->arch.ttbcr = ctxt->ttbcr;
clear_bit(_VPF_down, &v->pause_flags);
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 1a2b95f..339c327 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -61,6 +61,30 @@ static struct {
irq_desc_t irq_desc[NR_IRQS];
unsigned nr_lrs;
+void gic_save_state(struct vcpu *v)
+{
+ int i;
+
+ for ( i=0; i<nr_lrs; i++)
+ v->arch.gic_lr[i] = GICH[GICH_LR + i];
+ /* Disable until next VCPU scheduled */
+ GICH[GICH_HCR] = 0;
+ isb();
+}
+
+void gic_restore_state(struct vcpu *v)
+{
+ int i;
+
+ if ( is_idle_vcpu(v) )
+ return;
+
+ for ( i=0; i<nr_lrs; i++)
+ GICH[GICH_LR + i] = v->arch.gic_lr[i];
+ GICH[GICH_HCR] = GICH_HCR_EN;
+ isb();
+}
+
static unsigned int gic_irq_startup(struct irq_desc *desc)
{
uint32_t enabler;
@@ -263,7 +287,6 @@ static void __cpuinit gic_hyp_init(void)
vtr = GICH[GICH_VTR];
nr_lrs = (vtr & GICH_VTR_NRLRGS) + 1;
- GICH[GICH_HCR] = GICH_HCR_EN;
GICH[GICH_MISR] = GICH_MISR_EOI;
}
diff --git a/xen/arch/arm/gic.h b/xen/arch/arm/gic.h
index ff8d0a2..ac9cf3a 100644
--- a/xen/arch/arm/gic.h
+++ b/xen/arch/arm/gic.h
@@ -70,8 +70,8 @@
#define GICH_MISR (0x10/4)
#define GICH_EISR0 (0x20/4)
#define GICH_EISR1 (0x24/4)
-#define GICH_ELRSR0 (0x30/4)
-#define GICH_ELRSR1 (0x34/4)
+#define GICH_ELSR0 (0x30/4)
+#define GICH_ELSR1 (0x34/4)
#define GICH_APR (0xF0/4)
#define GICH_LR (0x100/4)
@@ -149,6 +149,11 @@ extern void gic_init_secondary_cpu(void);
extern void gic_disable_cpu(void);
/* setup the gic virtual interface for a guest */
extern void gicv_setup(struct domain *d);
+
+/* Context switch */
+extern void gic_save_state(struct vcpu *v);
+extern void gic_restore_state(struct vcpu *v);
+
#endif
/*
diff --git a/xen/include/asm-arm/cpregs.h b/xen/include/asm-arm/cpregs.h
index 7a0b49a..bd46942 100644
--- a/xen/include/asm-arm/cpregs.h
+++ b/xen/include/asm-arm/cpregs.h
@@ -88,6 +88,19 @@
* arguments, which are cp,opc1,crn,crm,opc2.
*/
+/* Coprocessor 14 */
+
+/* CP14 CR0: */
+#define TEECR p14,6,c0,c0,0 /* ThumbEE Configuration Register */
+
+/* CP14 CR1: */
+#define TEEHBR p14,6,c1,c0,0 /* ThumbEE Handler Base Register */
+#define JOSCR p14,7,c1,c0,0 /* Jazelle OS Control Register */
+
+/* CP14 CR2: */
+#define JMCR p14,7,c2,c0,0 /* Jazelle Main Configuration Register
*/
+
+
/* Coprocessor 15 */
/* CP15 CR0: CPUID and Cache Type Registers */
@@ -112,6 +125,8 @@
/* CP15 CR1: System Control Registers */
#define SCTLR p15,0,c1,c0,0 /* System Control Register */
+#define ACTLR p15,0,c1,c0,1 /* Auxiliary Control Register */
+#define CPACR p15,0,c1,c0,2 /* Coprocessor Access Control Register
*/
#define SCR p15,0,c1,c1,0 /* Secure Configuration Register */
#define NSACR p15,0,c1,c1,2 /* Non-Secure Access Control Register
*/
#define HSCTLR p15,4,c1,c0,0 /* Hyp. System Control Register */
@@ -127,12 +142,15 @@
#define VTTBR p15,6,c2 /* Virtualization Translation Table
Base Register */
/* CP15 CR3: Domain Access Control Register */
+#define DACR p15,0,c3,c0,0 /* Domain Access Control Register */
/* CP15 CR4: */
/* CP15 CR5: Fault Status Registers */
#define DFSR p15,0,c5,c0,0 /* Data Fault Status Register */
#define IFSR p15,0,c5,c0,1 /* Instruction Fault Status Register */
+#define ADFSR p15,0,c5,c1,0 /* Auxiliary Data Fault Status
Register */
+#define AIFSR p15,0,c5,c1,1 /* Auxiliary Instruction Fault Status
Register */
#define HSR p15,4,c5,c2,0 /* Hyp. Syndrome Register */
/* CP15 CR6: Fault Address Registers */
@@ -144,6 +162,7 @@
/* CP15 CR7: Cache and address translation operations */
#define PAR p15,0,c7 /* Physical Address Register */
+
#define ICIALLUIS p15,0,c7,c1,0 /* Invalidate all instruction caches
to PoU inner shareable */
#define BPIALLIS p15,0,c7,c1,6 /* Invalidate entire branch predictor
array inner shareable */
#define ICIALLU p15,0,c7,c5,0 /* Invalidate all instruction caches
to PoU */
@@ -192,20 +211,24 @@
/* CP15 CR9: */
/* CP15 CR10: */
-#define MAIR0 p15,0,c10,c2,0 /* Memory Attribute Indirection
Register 0 */
-#define MAIR1 p15,0,c10,c2,1 /* Memory Attribute Indirection
Register 1 */
+#define MAIR0 p15,0,c10,c2,0 /* Memory Attribute Indirection
Register 0 AKA PRRR */
+#define MAIR1 p15,0,c10,c2,1 /* Memory Attribute Indirection
Register 1 AKA NMRR */
#define HMAIR0 p15,4,c10,c2,0 /* Hyp. Memory Attribute Indirection
Register 0 */
#define HMAIR1 p15,4,c10,c2,1 /* Hyp. Memory Attribute Indirection
Register 1 */
/* CP15 CR11: DMA Operations for TCM Access */
/* CP15 CR12: */
+#define VBAR p15,0,c12,c0,0 /* Vector Base Address Register */
#define HVBAR p15,4,c12,c0,0 /* Hyp. Vector Base Address Register */
/* CP15 CR13: */
#define FCSEIDR p15,0,c13,c0,0 /* FCSE Process ID Register */
#define CONTEXTIDR p15,0,c13,c0,1 /* Context ID Register */
-#define HTPIDR p15,4,c13,c0,2 /* Hyp. Software Thread ID Register */
+#define TPIDRURW p15,0,c13,c0,2 /* Software Thread ID, User, R/W */
+#define TPIDRURO p15,0,c13,c0,3 /* Software Thread ID, User, R/O */
+#define TPIDRPRW p15,0,c13,c0,4 /* Software Thread ID, Priveleged */
+#define HTPIDR p15,4,c13,c0,2 /* HYp Software Thread Id Register */
/* CP15 CR14: */
#define CNTPCT p15,0,c14 /* Time counter value */
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index f295a82..620b26e 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -81,8 +81,37 @@ struct arch_vcpu
*/
struct cpu_info *cpu_info;
- uint32_t sctlr;
- uint32_t ttbr0, ttbr1, ttbcr;
+ /* Fault Status */
+ uint32_t dfar, ifar;
+ uint32_t dfsr, ifsr;
+ uint32_t adfsr, aifsr;
+
+ /* MMU */
+ uint32_t vbar;
+ uint32_t ttbcr;
+ uint32_t ttbr0, ttbr1;
+
+ uint32_t dacr;
+ uint64_t par;
+ uint32_t mair0, mair1;
+
+ /* Control Registers */
+ uint32_t actlr, sctlr;
+ uint32_t cpacr;
+
+ uint32_t contextidr;
+ uint32_t tpidrurw;
+ uint32_t tpidruro;
+ uint32_t tpidrprw;
+
+ uint32_t teecr, teehbr;
+ uint32_t joscr, jmcr;
+
+ /* CP 15 */
+ uint32_t csselr;
+
+ uint32_t gic_hcr, gic_vmcr, gic_apr;
+ uint32_t gic_lr[64];
struct {
struct vgic_irq_rank private_irqs;
diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index e439727..e915cbf 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -124,6 +124,9 @@ typedef uint32_t xen_ulong_t;
struct vcpu_guest_context {
struct cpu_user_regs user_regs; /* User-level CPU registers */
+
+ uint32_t sctlr;
+ uint32_t ttbr0, ttbr1, ttbcr;
};
typedef struct vcpu_guest_context vcpu_guest_context_t;
DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
--
1.7.9.1
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