redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

kvm: arm64: Clean up VTCR_EL2 initialisation 

Use the new helper for converting the parange to the physical shift.
Also, add the missing definitions for the VTCR_EL2 register fields
and use them instead of hard coding numbers.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <cdall@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
hifive-unleashed-5.1
Suzuki K Poulose 2018-09-26 17:32:41 +01:00 committed by Marc Zyngier
parent ce00e3cb4f
commit b2df44ffba
2 changed files with 11 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/include/asm/kvm_arm.h
View File

@ -107,6 +107,7 @@
#define VTCR_EL2_RES1 (1 << 31)
#define VTCR_EL2_HD (1 << 22)
#define VTCR_EL2_HA (1 << 21)
#define VTCR_EL2_PS_SHIFT TCR_EL2_PS_SHIFT
#define VTCR_EL2_PS_MASK TCR_EL2_PS_MASK
#define VTCR_EL2_TG0_MASK TCR_TG0_MASK
#define VTCR_EL2_TG0_4K TCR_TG0_4K
@ -127,6 +128,8 @@
#define VTCR_EL2_VS_8BIT (0 << VTCR_EL2_VS_SHIFT)
#define VTCR_EL2_VS_16BIT (1 << VTCR_EL2_VS_SHIFT)
#define VTCR_EL2_T0SZ(x) TCR_T0SZ(x)
/*
* We configure the Stage-2 page tables to always restrict the IPA space to be
* 40 bits wide (T0SZ = 24). Systems with a PARange smaller than 40 bits are

34
arch/arm64/kvm/hyp/s2-setup.c
View File

@ -19,45 +19,27 @@
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
#include <asm/cpufeature.h>
u32 __hyp_text __init_stage2_translation(void)
{
u64 val = VTCR_EL2_FLAGS;
u64 parange;
u32 phys_shift;
u64 tmp;
/*
* Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS
* bits in VTCR_EL2. Amusingly, the PARange is 4 bits, while
* PS is only 3. Fortunately, bit 19 is RES0 in VTCR_EL2...
* bits in VTCR_EL2. Amusingly, the PARange is 4 bits, but the
* allocated values are limited to 3bits.
*/
parange = read_sysreg(id_aa64mmfr0_el1) & 7;
if (parange > ID_AA64MMFR0_PARANGE_MAX)
parange = ID_AA64MMFR0_PARANGE_MAX;
val |= parange << 16;
val |= parange << VTCR_EL2_PS_SHIFT;
/* Compute the actual PARange... */
switch (parange) {
case 0:
parange = 32;
break;
case 1:
parange = 36;
break;
case 2:
parange = 40;
break;
case 3:
parange = 42;
break;
case 4:
parange = 44;
break;
case 5:
default:
parange = 48;
break;
}
phys_shift = id_aa64mmfr0_parange_to_phys_shift(parange);
/*
* ... and clamp it to 40 bits, unless we have some braindead
@ -65,7 +47,7 @@ u32 __hyp_text __init_stage2_translation(void)
* return that value for the rest of the kernel to decide what
* to do.
*/
val |= 64 - (parange > 40 ? 40 : parange);
val |= VTCR_EL2_T0SZ(phys_shift > 40 ? 40 : phys_shift);
/*
* Check the availability of Hardware Access Flag / Dirty Bit
@ -86,5 +68,5 @@ u32 __hyp_text __init_stage2_translation(void)
write_sysreg(val, vtcr_el2);
return parange;
return phys_shift;
}