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Subject[PATCH v6 6/7] arm64: KVM: Set physical address size related factors in runtime
Date
This patch sets TCR_EL2.PS, VTCR_EL2.T0SZ and vttbr_baddr_mask in runtime,
not compile time.

In ARMv8, EL2 physical address size (TCR_EL2.PS) and stage2 input address
size (VTCR_EL2.T0SZE) cannot be determined in compile time since they
depends on hardware capability.

According to Table D4-23 and Table D4-25 in ARM DDI 0487A.b document,
vttbr_x is calculated using different hard-coded values with consideration
of T0SZ, granule size and the level of translation tables. Therefore,
vttbr_baddr_mask should be determined dynamically.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Jungseok Lee <jays.lee@samsung.com>
Reviewed-by: Sungjinn Chung <sungjinn.chung@samsung.com>
---
arch/arm/kvm/arm.c | 82 +++++++++++++++++++++++++++++++++++++-
arch/arm64/include/asm/kvm_arm.h | 17 ++------
arch/arm64/kvm/hyp-init.S | 20 +++++++---
3 files changed, 98 insertions(+), 21 deletions(-)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index f0e50a0..9f19f2c 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -37,6 +37,7 @@
#include <asm/mman.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
+#include <asm/cputype.h>
#include <asm/virt.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
@@ -61,6 +62,9 @@ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
static u8 kvm_next_vmid;
static DEFINE_SPINLOCK(kvm_vmid_lock);

+/* VTTBR mask cannot be determined in complie time under ARMv8 */
+static u64 vttbr_baddr_mask;
+
static bool vgic_present;

static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
@@ -412,6 +416,75 @@ static bool need_new_vmid_gen(struct kvm *kvm)
}

/**
+ * set_vttbr_baddr_mask - set mask value for vttbr base address
+ *
+ * In ARMv8, vttbr_baddr_mask cannot be determined in compile time since stage2
+ * input address size depends on hardware capability. Thus, it is needed to read
+ * ID_AA64MMFR0_EL1.PARange first and then set vttbr_baddr_mask with consideration
+ * of both granule size and the level of translation tables.
+ */
+static int set_vttbr_baddr_mask(void)
+{
+#ifndef CONFIG_ARM64
+ vttbr_baddr_mask = VTTBR_BADDR_MASK;
+#else
+ int pa_range, t0sz, vttbr_x;
+
+ pa_range = read_cpuid(ID_AA64MMFR0_EL1) & 0xf;
+
+ switch (pa_range) {
+ case 0:
+ t0sz = VTCR_EL2_T0SZ(32);
+ break;
+ case 1:
+ t0sz = VTCR_EL2_T0SZ(36);
+ break;
+ case 2:
+ t0sz = VTCR_EL2_T0SZ(40);
+ break;
+ case 3:
+ t0sz = VTCR_EL2_T0SZ(42);
+ break;
+ case 4:
+ t0sz = VTCR_EL2_T0SZ(44);
+ break;
+ default:
+ t0sz = VTCR_EL2_T0SZ(48);
+ }
+
+ /*
+ * See Table D4-23 and Table D4-25 in ARM DDI 0487A.b to figure out
+ * the origin of the hardcoded values, 38 and 37.
+ */
+#ifdef CONFIG_ARM64_64K_PAGES
+ /*
+ * 16 <= T0SZ <= 21 is valid under 3 level of translation tables
+ * 18 <= T0SZ <= 34 is valid under 2 level of translation tables
+ * 31 <= T0SZ <= 39 is valid under 1 level of transltaion tables
+ */
+ if (t0sz <= 17) {
+ kvm_err("Cannot support %d-bit address space\n", 64 - t0sz);
+ return -EINVAL;
+ }
+ vttbr_x = 38 - t0sz;
+#else
+ /*
+ * 16 <= T0SZ <= 24 is valid under 4 level of translation tables
+ * 21 <= T0SZ <= 30 is valid under 3 level of translation tables
+ * 30 <= T0SZ <= 39 is valid under 2 level of translation tables
+ */
+ if (t0sz <= 20) {
+ kvm_err("Cannot support %d-bit address space\n", 64 - t0sz);
+ return -EINVAL;
+ }
+ vttbr_x = 37 - t0sz;
+#endif
+ vttbr_baddr_mask = (((1LLU << (48 - vttbr_x)) - 1) << (vttbr_x - 1));
+#endif
+ return 0;
+}
+
+/**
* update_vttbr - Update the VTTBR with a valid VMID before the guest runs
* @kvm The guest that we are about to run
*
@@ -465,7 +538,7 @@ static void update_vttbr(struct kvm *kvm)
/* update vttbr to be used with the new vmid */
pgd_phys = virt_to_phys(kvm->arch.pgd);
vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
- kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
+ kvm->arch.vttbr = pgd_phys & vttbr_baddr_mask;
kvm->arch.vttbr |= vmid;

spin_unlock(&kvm_vmid_lock);
@@ -1051,6 +1124,12 @@ int kvm_arch_init(void *opaque)
}
}

+ err = set_vttbr_baddr_mask();
+ if (err) {
+ kvm_err("Cannot set vttbr_baddr_mask\n");
+ return -EINVAL;
+ }
+
cpu_notifier_register_begin();

err = init_hyp_mode();
@@ -1068,6 +1147,7 @@ int kvm_arch_init(void *opaque)
hyp_cpu_pm_init();

kvm_coproc_table_init();
+
return 0;
out_err:
cpu_notifier_register_done();
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 3d69030..8dbef70 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -94,7 +94,6 @@
/* TCR_EL2 Registers bits */
#define TCR_EL2_TBI (1 << 20)
#define TCR_EL2_PS (7 << 16)
-#define TCR_EL2_PS_40B (2 << 16)
#define TCR_EL2_TG0 (1 << 14)
#define TCR_EL2_SH0 (3 << 12)
#define TCR_EL2_ORGN0 (3 << 10)
@@ -103,8 +102,6 @@
#define TCR_EL2_MASK (TCR_EL2_TG0 | TCR_EL2_SH0 | \
TCR_EL2_ORGN0 | TCR_EL2_IRGN0 | TCR_EL2_T0SZ)

-#define TCR_EL2_FLAGS (TCR_EL2_PS_40B)
-
/* VTCR_EL2 Registers bits */
#define VTCR_EL2_PS_MASK (7 << 16)
#define VTCR_EL2_TG0_MASK (1 << 14)
@@ -119,36 +116,28 @@
#define VTCR_EL2_SL0_MASK (3 << 6)
#define VTCR_EL2_SL0_LVL1 (1 << 6)
#define VTCR_EL2_T0SZ_MASK 0x3f
-#define VTCR_EL2_T0SZ_40B 24
+#define VTCR_EL2_T0SZ(bits) (64 - (bits))

#ifdef CONFIG_ARM64_64K_PAGES
/*
* Stage2 translation configuration:
- * 40bits output (PS = 2)
- * 40bits input (T0SZ = 24)
* 64kB pages (TG0 = 1)
* 2 level page tables (SL = 1)
*/
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_64K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
- VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
-#define VTTBR_X (38 - VTCR_EL2_T0SZ_40B)
+ VTCR_EL2_SL0_LVL1)
#else
/*
* Stage2 translation configuration:
- * 40bits output (PS = 2)
- * 40bits input (T0SZ = 24)
* 4kB pages (TG0 = 0)
* 3 level page tables (SL = 1)
*/
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_4K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
- VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
-#define VTTBR_X (37 - VTCR_EL2_T0SZ_40B)
+ VTCR_EL2_SL0_LVL1)
#endif

-#define VTTBR_BADDR_SHIFT (VTTBR_X - 1)
-#define VTTBR_BADDR_MASK (((1LLU << (40 - VTTBR_X)) - 1) << VTTBR_BADDR_SHIFT)
#define VTTBR_VMID_SHIFT (48LLU)
#define VTTBR_VMID_MASK (0xffLLU << VTTBR_VMID_SHIFT)

diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index d968796..c0f7634 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -63,17 +63,21 @@ __do_hyp_init:
mrs x4, tcr_el1
ldr x5, =TCR_EL2_MASK
and x4, x4, x5
- ldr x5, =TCR_EL2_FLAGS
- orr x4, x4, x5
- msr tcr_el2, x4
-
- ldr x4, =VTCR_EL2_FLAGS
/*
* Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in
- * VTCR_EL2.
+ * TCR_EL2 and both PS bits and T0SZ bits in VTCR_EL2.
*/
mrs x5, ID_AA64MMFR0_EL1
bfi x4, x5, #16, #3
+ msr tcr_el2, x4
+
+ ldr x4, =VTCR_EL2_FLAGS
+ bfi x4, x5, #16, #3
+ and x5, x5, #0xf
+ adr x6, t0sz
+ add x6, x6, x5, lsl #2
+ ldr w5, [x6]
+ orr x4, x4, x5
msr vtcr_el2, x4

mrs x4, mair_el1
@@ -109,6 +113,10 @@ target: /* We're now in the trampoline code, switch page tables */

/* Hello, World! */
eret
+
+t0sz:
+ .word VTCR_EL2_T0SZ(32), VTCR_EL2_T0SZ(36), VTCR_EL2_T0SZ(40)
+ .word VTCR_EL2_T0SZ(42), VTCR_EL2_T0SZ(44), VTCR_EL2_T0SZ(48)
ENDPROC(__kvm_hyp_init)

.ltorg
--
1.7.10.4



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