| Message ID | 9ee3fb6a196a514c93325bdfa15594beecf04876.1459605520.git.luto@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sat, Apr 02, 2016 at 07:01:36AM -0700, Andy Lutomirski wrote: > These hooks match the _safe variants, so name them accordingly. > This will make room for unsafe PV hooks. > > Signed-off-by: Andy Lutomirski <luto@kernel.org> > --- > arch/x86/include/asm/paravirt.h | 33 +++++++++++++++++---------------- > arch/x86/include/asm/paravirt_types.h | 8 ++++---- > arch/x86/kernel/paravirt.c | 4 ++-- > arch/x86/xen/enlighten.c | 4 ++-- > 4 files changed, 25 insertions(+), 24 deletions(-) ... > diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h > index 77db5616a473..5a06cccd36f0 100644 > --- a/arch/x86/include/asm/paravirt_types.h > +++ b/arch/x86/include/asm/paravirt_types.h > @@ -155,10 +155,10 @@ struct pv_cpu_ops { > void (*cpuid)(unsigned int *eax, unsigned int *ebx, > unsigned int *ecx, unsigned int *edx); > > - /* MSR, PMC and TSR operations. > - err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ > - u64 (*read_msr)(unsigned int msr, int *err); > - int (*write_msr)(unsigned int msr, unsigned low, unsigned high); > + /* MSR operations. > + err = 0/-EIO. wrmsr returns 0/-EIO. */ Please reformat this comment properly, while you're at it: /* * A sentence. * Another sentence. */ > + u64 (*read_msr_safe)(unsigned int msr, int *err)Please reformat this > comment properly, while you're at it: > + int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high); > > u64 (*read_pmc)(int counter); >
On Sun, Apr 3, 2016 at 1:41 AM, Borislav Petkov <bp@alien8.de> wrote: > On Sat, Apr 02, 2016 at 07:01:36AM -0700, Andy Lutomirski wrote: >> These hooks match the _safe variants, so name them accordingly. >> This will make room for unsafe PV hooks. >> >> Signed-off-by: Andy Lutomirski <luto@kernel.org> >> --- >> arch/x86/include/asm/paravirt.h | 33 +++++++++++++++++---------------- >> arch/x86/include/asm/paravirt_types.h | 8 ++++---- >> arch/x86/kernel/paravirt.c | 4 ++-- >> arch/x86/xen/enlighten.c | 4 ++-- >> 4 files changed, 25 insertions(+), 24 deletions(-) > > ... > >> diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h >> index 77db5616a473..5a06cccd36f0 100644 >> --- a/arch/x86/include/asm/paravirt_types.h >> +++ b/arch/x86/include/asm/paravirt_types.h >> @@ -155,10 +155,10 @@ struct pv_cpu_ops { >> void (*cpuid)(unsigned int *eax, unsigned int *ebx, >> unsigned int *ecx, unsigned int *edx); >> >> - /* MSR, PMC and TSR operations. >> - err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ >> - u64 (*read_msr)(unsigned int msr, int *err); >> - int (*write_msr)(unsigned int msr, unsigned low, unsigned high); >> + /* MSR operations. >> + err = 0/-EIO. wrmsr returns 0/-EIO. */ > > Please reformat this comment properly, while you're at it: > > /* > * A sentence. > * Another sentence. > */ You already caught that one. It's fixed in "x86/paravirt: Add paravirt_{read,write}_msr". Congrats on being deterministic :) --Andy
On Sun, Apr 03, 2016 at 06:23:36AM -0700, Andy Lutomirski wrote: > You already caught that one. It's fixed in "x86/paravirt: Add > paravirt_{read,write}_msr". > > Congrats on being deterministic :) LOL. TBH, I had a strange deja-vu while typing... :-)
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index f6192502149e..2e49228ed9a3 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -129,34 +129,35 @@ static inline void wbinvd(void) #define get_kernel_rpl() (pv_info.kernel_rpl) -static inline u64 paravirt_read_msr(unsigned msr, int *err) +static inline u64 paravirt_read_msr_safe(unsigned msr, int *err) { - return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err); + return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err); } -static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high) +static inline int paravirt_write_msr_safe(unsigned msr, + unsigned low, unsigned high) { - return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high); + return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high); } /* These should all do BUG_ON(_err), but our headers are too tangled. */ #define rdmsr(msr, val1, val2) \ do { \ int _err; \ - u64 _l = paravirt_read_msr(msr, &_err); \ + u64 _l = paravirt_read_msr_safe(msr, &_err); \ val1 = (u32)_l; \ val2 = _l >> 32; \ } while (0) #define wrmsr(msr, val1, val2) \ do { \ - paravirt_write_msr(msr, val1, val2); \ + paravirt_write_msr_safe(msr, val1, val2); \ } while (0) #define rdmsrl(msr, val) \ do { \ int _err; \ - val = paravirt_read_msr(msr, &_err); \ + val = paravirt_read_msr_safe(msr, &_err); \ } while (0) static inline void wrmsrl(unsigned msr, u64 val) @@ -164,23 +165,23 @@ static inline void wrmsrl(unsigned msr, u64 val) wrmsr(msr, (u32)val, (u32)(val>>32)); } -#define wrmsr_safe(msr, a, b) paravirt_write_msr(msr, a, b) +#define wrmsr_safe(msr, a, b) paravirt_write_msr_safe(msr, a, b) /* rdmsr with exception handling */ -#define rdmsr_safe(msr, a, b) \ -({ \ - int _err; \ - u64 _l = paravirt_read_msr(msr, &_err); \ - (*a) = (u32)_l; \ - (*b) = _l >> 32; \ - _err; \ +#define rdmsr_safe(msr, a, b) \ +({ \ + int _err; \ + u64 _l = paravirt_read_msr_safe(msr, &_err); \ + (*a) = (u32)_l; \ + (*b) = _l >> 32; \ + _err; \ }) static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) { int err; - *p = paravirt_read_msr(msr, &err); + *p = paravirt_read_msr_safe(msr, &err); return err; } diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 77db5616a473..5a06cccd36f0 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -155,10 +155,10 @@ struct pv_cpu_ops { void (*cpuid)(unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx); - /* MSR, PMC and TSR operations. - err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ - u64 (*read_msr)(unsigned int msr, int *err); - int (*write_msr)(unsigned int msr, unsigned low, unsigned high); + /* MSR operations. + err = 0/-EIO. wrmsr returns 0/-EIO. */ + u64 (*read_msr_safe)(unsigned int msr, int *err); + int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high); u64 (*read_pmc)(int counter); diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index f08ac28b8136..8aad95478ae5 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -339,8 +339,8 @@ __visible struct pv_cpu_ops pv_cpu_ops = { .write_cr8 = native_write_cr8, #endif .wbinvd = native_wbinvd, - .read_msr = native_read_msr_safe, - .write_msr = native_write_msr_safe, + .read_msr_safe = native_read_msr_safe, + .write_msr_safe = native_write_msr_safe, .read_pmc = native_read_pmc, .load_tr_desc = native_load_tr_desc, .set_ldt = native_set_ldt, diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index d09e4c9d7cc5..ff2df20d0067 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1222,8 +1222,8 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = { .wbinvd = native_wbinvd, - .read_msr = xen_read_msr_safe, - .write_msr = xen_write_msr_safe, + .read_msr_safe = xen_read_msr_safe, + .write_msr_safe = xen_write_msr_safe, .read_pmc = xen_read_pmc,
These hooks match the _safe variants, so name them accordingly. This will make room for unsafe PV hooks. Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/include/asm/paravirt.h | 33 +++++++++++++++++---------------- arch/x86/include/asm/paravirt_types.h | 8 ++++---- arch/x86/kernel/paravirt.c | 4 ++-- arch/x86/xen/enlighten.c | 4 ++-- 4 files changed, 25 insertions(+), 24 deletions(-)