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allow guest user applications read CNTVCT_EL0/CNTFRQ_EL0

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At present, when doing syscall_kvm test, we need to
enable the function of ESR_ELx_SYS64_ISS_SYS_CNTVCT/ESR_ELx_SYS64_ISS_SYS_CNTFRQ to
successfully pass the test.

I set CNTKCTL_EL1.EL0VCTEN==1/CNTKCTL_EL1.EL0PCTEN==1, so that the related cases can passed.

Signed-off-by: Bin Lu <bin.lu@arm.com>
This commit is contained in:
Bin Lu
2020-07-26 22:25:27 -04:00
parent d6b676ae6a
commit ced5863c49
1 changed files with 9 additions and 0 deletions
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pkg/sentry/platform/ring0/entry_arm64.s
+9
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@@ -48,6 +48,12 @@
#define SCTLR_EL1_DEFAULT (SCTLR_M | SCTLR_C | SCTLR_I | SCTLR_UCT)
// cntkctl_el1: counter-timer kernel control register el1.
#define CNTKCTL_EL0PCTEN 1 << 0
#define CNTKCTL_EL0VCTEN 1 << 1
#define CNTKCTL_EL1_DEFAULT (CNTKCTL_EL0PCTEN | CNTKCTL_EL0VCTEN)
// Saves a register set.
//
// This is a macro because it may need to executed in contents where a stack is
@@ -509,6 +515,9 @@ TEXT ·Start(SB),NOSPLIT,$0
MOVD $SCTLR_EL1_DEFAULT, R1
MSR R1, SCTLR_EL1
MOVD $CNTKCTL_EL1_DEFAULT, R1
MSR R1, CNTKCTL_EL1
MOVD R8, RSV_REG
ORR $0xffff000000000000, RSV_REG, RSV_REG
WORD $0xd518d092 //MSR R18, TPIDR_EL1