August 2022 - Linux-stable-mirror

[PATCH AUTOSEL 4.14 01/14] drm/r128: Fix undefined behavior due to shift overflowing the constant

by Sasha Levin

From: Borislav Petkov <bp(a)suse.de> [ Upstream commit 6556551f8848f98eff356c8aacae42c8dd65b2df ] Fix: drivers/gpu/drm/r128/r128_cce.c: In function ‘r128_do_init_cce’: drivers/gpu/drm/r128/r128_cce.c:417:2: error: case label does not reduce to an integer constant case R128_PM4_64BM_64VCBM_64INDBM: ^~~~ drivers/gpu/drm/r128/r128_cce.c:418:2: error: case label does not reduce to an integer constant case R128_PM4_64PIO_64VCPIO_64INDPIO: ^~~~ See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory details as to why it triggers with older gccs only. Reviewed-by: Randy Dunlap <rdunlap(a)infradead.org> Signed-off-by: Borislav Petkov <bp(a)suse.de> Cc: David Airlie <airlied(a)linux.ie> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: dri-devel(a)lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter(a)ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20220405151517.29753-5-bp@ali… Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- drivers/gpu/drm/r128/r128_drv.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/r128/r128_drv.h b/drivers/gpu/drm/r128/r128_drv.h index 09143b840482..6553a855a176 100644 --- a/drivers/gpu/drm/r128/r128_drv.h +++ b/drivers/gpu/drm/r128/r128_drv.h @@ -289,8 +289,8 @@ extern long r128_compat_ioctl(struct file *filp, unsigned int cmd, # define R128_PM4_64PIO_128INDBM (5 << 28) # define R128_PM4_64BM_128INDBM (6 << 28) # define R128_PM4_64PIO_64VCBM_64INDBM (7 << 28) -# define R128_PM4_64BM_64VCBM_64INDBM (8 << 28) -# define R128_PM4_64PIO_64VCPIO_64INDPIO (15 << 28) +# define R128_PM4_64BM_64VCBM_64INDBM (8U << 28) +# define R128_PM4_64PIO_64VCPIO_64INDPIO (15U << 28) # define R128_PM4_BUFFER_CNTL_NOUPDATE (1 << 27) #define R128_PM4_BUFFER_WM_CNTL 0x0708 -- 2.35.1

3 years, 4 months

1
13
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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

1
0
0 0

FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

1
0
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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

1
0
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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 5.18-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to 5.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

3 years, 4 months

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FAILED: patch "[PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9" failed to apply to see-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the see-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" <Jason(a)zx2c4.com> Date: Thu, 28 Jul 2022 00:32:18 +1000 Subject: [PATCH] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9 The existing logic in KVM to support guests calling H_RANDOM only works on Power8, because it looks for an RNG in the device tree, but on Power9 we just use darn. In addition the existing code needs to work in real mode, so we have the special cased powernv_get_random_real_mode() to deal with that. Instead just have KVM call ppc_md.get_random_seed(), and do the real mode check inside of there, that way we use whatever RNG is available, including darn on Power9. Fixes: e928e9cb3601 ("KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.") Cc: stable(a)vger.kernel.org # v4.1+ Signed-off-by: Jason A. Donenfeld <Jason(a)zx2c4.com> Tested-by: Sachin Sant <sachinp(a)linux.ibm.com> [mpe: Rebase on previous commit, update change log appropriately] Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20220727143219.2684192-2-mpe@ellerman.id.au diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h index 9a53e29680f4..258174304904 100644 --- a/arch/powerpc/include/asm/archrandom.h +++ b/arch/powerpc/include/asm/archrandom.h @@ -38,12 +38,7 @@ static inline bool __must_check arch_get_random_seed_int(unsigned int *v) #endif /* CONFIG_ARCH_RANDOM */ #ifdef CONFIG_PPC_POWERNV -int powernv_hwrng_present(void); int powernv_get_random_long(unsigned long *v); -int powernv_get_random_real_mode(unsigned long *v); -#else -static inline int powernv_hwrng_present(void) { return 0; } -static inline int powernv_get_random_real_mode(unsigned long *v) { return 0; } #endif #endif /* _ASM_POWERPC_ARCHRANDOM_H */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 88a8f6473c4e..3abaef5f9ac2 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,7 +19,7 @@ #include <asm/interrupt.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> -#include <asm/archrandom.h> +#include <asm/machdep.h> #include <asm/xics.h> #include <asm/xive.h> #include <asm/dbell.h> @@ -176,13 +176,14 @@ EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); int kvmppc_hwrng_present(void) { - return powernv_hwrng_present(); + return ppc_md.get_random_seed != NULL; } EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); long kvmppc_rm_h_random(struct kvm_vcpu *vcpu) { - if (powernv_get_random_real_mode(&vcpu->arch.regs.gpr[4])) + if (ppc_md.get_random_seed && + ppc_md.get_random_seed(&vcpu->arch.regs.gpr[4])) return H_SUCCESS; return H_HARDWARE; diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 2287c9cd0cd5..d19305292e1e 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -29,15 +29,6 @@ struct powernv_rng { static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); -int powernv_hwrng_present(void) -{ - struct powernv_rng *rng; - - rng = get_cpu_var(powernv_rng); - put_cpu_var(rng); - return rng != NULL; -} - static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) { unsigned long parity; @@ -58,19 +49,6 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) return val; } -int powernv_get_random_real_mode(unsigned long *v) -{ - struct powernv_rng *rng; - - rng = raw_cpu_read(powernv_rng); - if (!rng) - return 0; - - *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); - - return 1; -} - static int powernv_get_random_darn(unsigned long *v) { unsigned long val; @@ -107,12 +85,14 @@ int powernv_get_random_long(unsigned long *v) { struct powernv_rng *rng; - rng = get_cpu_var(powernv_rng); - - *v = rng_whiten(rng, in_be64(rng->regs)); - - put_cpu_var(rng); - + if (mfmsr() & MSR_DR) { + rng = get_cpu_var(powernv_rng); + *v = rng_whiten(rng, in_be64(rng->regs)); + put_cpu_var(rng); + } else { + rng = raw_cpu_read(powernv_rng); + *v = rng_whiten(rng, __raw_rm_readq(rng->regs_real)); + } return 1; } EXPORT_SYMBOL_GPL(powernv_get_random_long);

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Linux-stable-mirror August 2022