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Date: Mon, 13 Sep 2021 23:09:42 +0000 From: Raghavendra Rao Ananta <rananta@...gle.com> To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, Andrew Jones <drjones@...hat.com>, James Morse <james.morse@....com>, Alexandru Elisei <alexandru.elisei@....com>, Suzuki K Poulose <suzuki.poulose@....com> Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>, Ricardo Koller <ricarkol@...gle.com>, Oliver Upton <oupton@...gle.com>, Reiji Watanabe <reijiw@...gle.com>, Jing Zhang <jingzhangos@...gle.com>, Raghavendra Rao Anata <rananta@...gle.com>, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: [PATCH v6 01/14] KVM: arm64: selftests: Add MMIO readl/writel support Define the readl() and writel() functions for the guests to access (4-byte) the MMIO region. The routines, and their dependents, are inspired from the kernel's arch/arm64/include/asm/io.h and arch/arm64/include/asm/barrier.h. Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com> Reviewed-by: Oliver Upton <oupton@...gle.com> Reviewed-by: Andrew Jones <drjones@...hat.com> --- .../selftests/kvm/include/aarch64/processor.h | 46 ++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index c0273aefa63d..96578bd46a85 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -9,6 +9,7 @@ #include "kvm_util.h" #include <linux/stringify.h> +#include <linux/types.h> #define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \ @@ -130,6 +131,49 @@ void vm_install_sync_handler(struct kvm_vm *vm, val; \ }) -#define isb() asm volatile("isb" : : : "memory") +#define isb() asm volatile("isb" : : : "memory") +#define dsb(opt) asm volatile("dsb " #opt : : : "memory") +#define dmb(opt) asm volatile("dmb " #opt : : : "memory") + +#define dma_wmb() dmb(oshst) +#define __iowmb() dma_wmb() + +#define dma_rmb() dmb(oshld) + +#define __iormb(v) \ +({ \ + unsigned long tmp; \ + \ + dma_rmb(); \ + \ + /* \ + * Courtesy of arch/arm64/include/asm/io.h: \ + * Create a dummy control dependency from the IO read to any \ + * later instructions. This ensures that a subsequent call \ + * to udelay() will be ordered due to the ISB in __delay(). \ + */ \ + asm volatile("eor %0, %1, %1\n" \ + "cbnz %0, ." \ + : "=r" (tmp) : "r" ((unsigned long)(v)) \ + : "memory"); \ +}) + +static __always_inline void __raw_writel(u32 val, volatile void *addr) +{ + asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr)); +} + +static __always_inline u32 __raw_readl(const volatile void *addr) +{ + u32 val; + asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr)); + return val; +} + +#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c))) +#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) + +#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c));}) +#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(__v); __v; }) #endif /* SELFTEST_KVM_PROCESSOR_H */ -- 2.33.0.309.g3052b89438-goog
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