| Message ID | 1481872588-10876-2-git-send-email-bhupinder.thakur@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Bhupinder, On 16/12/16 07:16, Bhupinder Thakur wrote: > VMID space is increased to 16-bits from 8-bits in ARMv8 8.1 revision. > This allows more than 256 VMs to be supported by Xen. > > This change adds support for 16-bit VMIDs in Xen based on whether the > architecture supports it. > > Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org> Reviewed-by: Julien Grall <julien.grall@arm.com> Regards, > --- > xen/arch/arm/p2m.c | 52 ++++++++++++++++++++++++++++++++++------- > xen/include/asm-arm/p2m.h | 2 +- > xen/include/asm-arm/processor.h | 18 +++++++++++++- > 3 files changed, 62 insertions(+), 10 deletions(-) > > diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c > index 6930f8c..09ceb37 100644 > --- a/xen/arch/arm/p2m.c > +++ b/xen/arch/arm/p2m.c > @@ -7,6 +7,7 @@ > #include <xen/vm_event.h> > #include <xen/monitor.h> > #include <xen/iocap.h> > +#include <xen/xmalloc.h> > #include <public/vm_event.h> > #include <asm/flushtlb.h> > #include <asm/gic.h> > @@ -14,15 +15,25 @@ > #include <asm/hardirq.h> > #include <asm/page.h> > > +#define MAX_VMID_8_BIT (1UL << 8) > +#define MAX_VMID_16_BIT (1UL << 16) > + > +#define INVALID_VMID 0 /* VMID 0 is reserved */ > + > #ifdef CONFIG_ARM_64 > static unsigned int __read_mostly p2m_root_order; > static unsigned int __read_mostly p2m_root_level; > #define P2M_ROOT_ORDER p2m_root_order > #define P2M_ROOT_LEVEL p2m_root_level > +static unsigned int __read_mostly max_vmid = MAX_VMID_8_BIT; > +/* VMID is by default 8 bit width on AArch64 */ > +#define MAX_VMID max_vmid > #else > /* First level P2M is alway 2 consecutive pages */ > #define P2M_ROOT_LEVEL 1 > #define P2M_ROOT_ORDER 1 > +/* VMID is always 8 bit width on AArch32 */ > +#define MAX_VMID MAX_VMID_8_BIT > #endif > > #define P2M_ROOT_PAGES (1<<P2M_ROOT_ORDER) > @@ -1217,7 +1228,7 @@ static int p2m_alloc_table(struct domain *d) > > p2m->root = page; > > - p2m->vttbr = page_to_maddr(p2m->root) | ((uint64_t)p2m->vmid & 0xff) << 48; > + p2m->vttbr = page_to_maddr(p2m->root) | ((uint64_t)p2m->vmid << 48); > > /* > * Make sure that all TLBs corresponding to the new VMID are flushed > @@ -1228,19 +1239,27 @@ static int p2m_alloc_table(struct domain *d) > return 0; > } > > -#define MAX_VMID 256 > -#define INVALID_VMID 0 /* VMID 0 is reserved */ > > static spinlock_t vmid_alloc_lock = SPIN_LOCK_UNLOCKED; > > /* > - * VTTBR_EL2 VMID field is 8 bits. Using a bitmap here limits us to > - * 256 concurrent domains. > + * VTTBR_EL2 VMID field is 8 or 16 bits. AArch64 may support 16-bit VMID. > + * Using a bitmap here limits us to 256 or 65536 (for AArch64) concurrent > + * domains. The bitmap space will be allocated dynamically based on > + * whether 8 or 16 bit VMIDs are supported. > */ > -static DECLARE_BITMAP(vmid_mask, MAX_VMID); > +static unsigned long *vmid_mask; > > static void p2m_vmid_allocator_init(void) > { > + /* > + * allocate space for vmid_mask based on MAX_VMID > + */ > + vmid_mask = xzalloc_array(unsigned long, BITS_TO_LONGS(MAX_VMID)); > + > + if ( !vmid_mask ) > + panic("Could not allocate VMID bitmap space"); > + > set_bit(INVALID_VMID, vmid_mask); > } > > @@ -1630,20 +1649,36 @@ void __init setup_virt_paging(void) > > unsigned int cpu; > unsigned int pa_range = 0x10; /* Larger than any possible value */ > + bool vmid_8_bit = false; > > for_each_online_cpu ( cpu ) > { > const struct cpuinfo_arm *info = &cpu_data[cpu]; > if ( info->mm64.pa_range < pa_range ) > pa_range = info->mm64.pa_range; > + > + /* Set a flag if the current cpu does not support 16 bit VMIDs. */ > + if ( info->mm64.vmid_bits != MM64_VMID_16_BITS_SUPPORT ) > + vmid_8_bit = true; > } > > + /* > + * If the flag is not set then it means all CPUs support 16-bit > + * VMIDs. > + */ > + if ( !vmid_8_bit ) > + max_vmid = MAX_VMID_16_BIT; > + > /* pa_range is 4 bits, but the defined encodings are only 3 bits */ > if ( pa_range >= ARRAY_SIZE(pa_range_info) || !pa_range_info[pa_range].pabits ) > panic("Unknown encoding of ID_AA64MMFR0_EL1.PARange %x\n", pa_range); > > val |= VTCR_PS(pa_range); > val |= VTCR_TG0_4K; > + > + /* Set the VS bit only if 16 bit VMID is supported. */ > + if ( MAX_VMID == MAX_VMID_16_BIT ) > + val |= VTCR_VS; > val |= VTCR_SL0(pa_range_info[pa_range].sl0); > val |= VTCR_T0SZ(pa_range_info[pa_range].t0sz); > > @@ -1651,9 +1686,10 @@ void __init setup_virt_paging(void) > p2m_root_level = 2 - pa_range_info[pa_range].sl0; > p2m_ipa_bits = 64 - pa_range_info[pa_range].t0sz; > > - printk("P2M: %d-bit IPA with %d-bit PA\n", > + printk("P2M: %d-bit IPA with %d-bit PA and %d-bit VMID\n", > p2m_ipa_bits, > - pa_range_info[pa_range].pabits); > + pa_range_info[pa_range].pabits, > + ( MAX_VMID == MAX_VMID_16_BIT ) ? 16 : 8); > #endif > printk("P2M: %d levels with order-%d root, VTCR 0x%lx\n", > 4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, val); > diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h > index 0987be2..9de55fc 100644 > --- a/xen/include/asm-arm/p2m.h > +++ b/xen/include/asm-arm/p2m.h > @@ -30,7 +30,7 @@ struct p2m_domain { > struct page_info *root; > > /* Current VMID in use */ > - uint8_t vmid; > + uint16_t vmid; > > /* Current Translation Table Base Register for the p2m */ > uint64_t vttbr; > diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h > index 4163884..afc0e9a 100644 > --- a/xen/include/asm-arm/processor.h > +++ b/xen/include/asm-arm/processor.h > @@ -215,6 +215,8 @@ > > #define VTCR_PS(x) ((x)<<16) > > +#define VTCR_VS (_AC(0x1,UL)<<19) > + > #endif > > #define VTCR_RES1 (_AC(1,UL)<<31) > @@ -269,6 +271,11 @@ > /* FSR long format */ > #define FSRL_STATUS_DEBUG (_AC(0x22,UL)<<0) > > +#ifdef CONFIG_ARM_64 > +#define MM64_VMID_8_BITS_SUPPORT 0x0 > +#define MM64_VMID_16_BITS_SUPPORT 0x2 > +#endif > + > #ifndef __ASSEMBLY__ > > struct cpuinfo_arm { > @@ -337,7 +344,16 @@ struct cpuinfo_arm { > unsigned long tgranule_64K:4; > unsigned long tgranule_4K:4; > unsigned long __res0:32; > - }; > + > + unsigned long hafdbs:4; > + unsigned long vmid_bits:4; > + unsigned long vh:4; > + unsigned long hpds:4; > + unsigned long lo:4; > + unsigned long pan:4; > + unsigned long __res1:8; > + unsigned long __res2:32; > + }; > } mm64; > > struct { >
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c index 6930f8c..09ceb37 100644 --- a/xen/arch/arm/p2m.c +++ b/xen/arch/arm/p2m.c @@ -7,6 +7,7 @@ #include <xen/vm_event.h> #include <xen/monitor.h> #include <xen/iocap.h> +#include <xen/xmalloc.h> #include <public/vm_event.h> #include <asm/flushtlb.h> #include <asm/gic.h> @@ -14,15 +15,25 @@ #include <asm/hardirq.h> #include <asm/page.h> +#define MAX_VMID_8_BIT (1UL << 8) +#define MAX_VMID_16_BIT (1UL << 16) + +#define INVALID_VMID 0 /* VMID 0 is reserved */ + #ifdef CONFIG_ARM_64 static unsigned int __read_mostly p2m_root_order; static unsigned int __read_mostly p2m_root_level; #define P2M_ROOT_ORDER p2m_root_order #define P2M_ROOT_LEVEL p2m_root_level +static unsigned int __read_mostly max_vmid = MAX_VMID_8_BIT; +/* VMID is by default 8 bit width on AArch64 */ +#define MAX_VMID max_vmid #else /* First level P2M is alway 2 consecutive pages */ #define P2M_ROOT_LEVEL 1 #define P2M_ROOT_ORDER 1 +/* VMID is always 8 bit width on AArch32 */ +#define MAX_VMID MAX_VMID_8_BIT #endif #define P2M_ROOT_PAGES (1<<P2M_ROOT_ORDER) @@ -1217,7 +1228,7 @@ static int p2m_alloc_table(struct domain *d) p2m->root = page; - p2m->vttbr = page_to_maddr(p2m->root) | ((uint64_t)p2m->vmid & 0xff) << 48; + p2m->vttbr = page_to_maddr(p2m->root) | ((uint64_t)p2m->vmid << 48); /* * Make sure that all TLBs corresponding to the new VMID are flushed @@ -1228,19 +1239,27 @@ static int p2m_alloc_table(struct domain *d) return 0; } -#define MAX_VMID 256 -#define INVALID_VMID 0 /* VMID 0 is reserved */ static spinlock_t vmid_alloc_lock = SPIN_LOCK_UNLOCKED; /* - * VTTBR_EL2 VMID field is 8 bits. Using a bitmap here limits us to - * 256 concurrent domains. + * VTTBR_EL2 VMID field is 8 or 16 bits. AArch64 may support 16-bit VMID. + * Using a bitmap here limits us to 256 or 65536 (for AArch64) concurrent + * domains. The bitmap space will be allocated dynamically based on + * whether 8 or 16 bit VMIDs are supported. */ -static DECLARE_BITMAP(vmid_mask, MAX_VMID); +static unsigned long *vmid_mask; static void p2m_vmid_allocator_init(void) { + /* + * allocate space for vmid_mask based on MAX_VMID + */ + vmid_mask = xzalloc_array(unsigned long, BITS_TO_LONGS(MAX_VMID)); + + if ( !vmid_mask ) + panic("Could not allocate VMID bitmap space"); + set_bit(INVALID_VMID, vmid_mask); } @@ -1630,20 +1649,36 @@ void __init setup_virt_paging(void) unsigned int cpu; unsigned int pa_range = 0x10; /* Larger than any possible value */ + bool vmid_8_bit = false; for_each_online_cpu ( cpu ) { const struct cpuinfo_arm *info = &cpu_data[cpu]; if ( info->mm64.pa_range < pa_range ) pa_range = info->mm64.pa_range; + + /* Set a flag if the current cpu does not support 16 bit VMIDs. */ + if ( info->mm64.vmid_bits != MM64_VMID_16_BITS_SUPPORT ) + vmid_8_bit = true; } + /* + * If the flag is not set then it means all CPUs support 16-bit + * VMIDs. + */ + if ( !vmid_8_bit ) + max_vmid = MAX_VMID_16_BIT; + /* pa_range is 4 bits, but the defined encodings are only 3 bits */ if ( pa_range >= ARRAY_SIZE(pa_range_info) || !pa_range_info[pa_range].pabits ) panic("Unknown encoding of ID_AA64MMFR0_EL1.PARange %x\n", pa_range); val |= VTCR_PS(pa_range); val |= VTCR_TG0_4K; + + /* Set the VS bit only if 16 bit VMID is supported. */ + if ( MAX_VMID == MAX_VMID_16_BIT ) + val |= VTCR_VS; val |= VTCR_SL0(pa_range_info[pa_range].sl0); val |= VTCR_T0SZ(pa_range_info[pa_range].t0sz); @@ -1651,9 +1686,10 @@ void __init setup_virt_paging(void) p2m_root_level = 2 - pa_range_info[pa_range].sl0; p2m_ipa_bits = 64 - pa_range_info[pa_range].t0sz; - printk("P2M: %d-bit IPA with %d-bit PA\n", + printk("P2M: %d-bit IPA with %d-bit PA and %d-bit VMID\n", p2m_ipa_bits, - pa_range_info[pa_range].pabits); + pa_range_info[pa_range].pabits, + ( MAX_VMID == MAX_VMID_16_BIT ) ? 16 : 8); #endif printk("P2M: %d levels with order-%d root, VTCR 0x%lx\n", 4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, val); diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index 0987be2..9de55fc 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -30,7 +30,7 @@ struct p2m_domain { struct page_info *root; /* Current VMID in use */ - uint8_t vmid; + uint16_t vmid; /* Current Translation Table Base Register for the p2m */ uint64_t vttbr; diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h index 4163884..afc0e9a 100644 --- a/xen/include/asm-arm/processor.h +++ b/xen/include/asm-arm/processor.h @@ -215,6 +215,8 @@ #define VTCR_PS(x) ((x)<<16) +#define VTCR_VS (_AC(0x1,UL)<<19) + #endif #define VTCR_RES1 (_AC(1,UL)<<31) @@ -269,6 +271,11 @@ /* FSR long format */ #define FSRL_STATUS_DEBUG (_AC(0x22,UL)<<0) +#ifdef CONFIG_ARM_64 +#define MM64_VMID_8_BITS_SUPPORT 0x0 +#define MM64_VMID_16_BITS_SUPPORT 0x2 +#endif + #ifndef __ASSEMBLY__ struct cpuinfo_arm { @@ -337,7 +344,16 @@ struct cpuinfo_arm { unsigned long tgranule_64K:4; unsigned long tgranule_4K:4; unsigned long __res0:32; - }; + + unsigned long hafdbs:4; + unsigned long vmid_bits:4; + unsigned long vh:4; + unsigned long hpds:4; + unsigned long lo:4; + unsigned long pan:4; + unsigned long __res1:8; + unsigned long __res2:32; + }; } mm64; struct {
VMID space is increased to 16-bits from 8-bits in ARMv8 8.1 revision. This allows more than 256 VMs to be supported by Xen. This change adds support for 16-bit VMIDs in Xen based on whether the architecture supports it. Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org> --- xen/arch/arm/p2m.c | 52 ++++++++++++++++++++++++++++++++++------- xen/include/asm-arm/p2m.h | 2 +- xen/include/asm-arm/processor.h | 18 +++++++++++++- 3 files changed, 62 insertions(+), 10 deletions(-)