search for: paravirt_read_msr

...static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high) return PVOP_CALL3(int, pv_cpu_ops.write_msr, 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); \ + BUG_ON(_err); \ val1 = (u32)_l; \ val2 = _l >> 32; \ } while (0) -#define wrmsr(msr, val1, val2) \ -do { \ - paravirt_write_msr(msr, val1, val2); \ +#define wrmsr(msr, val1, val2) \ +do { \ + int _err; \ + _err = paravirt_write_msr(msr,...

...static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high) return PVOP_CALL3(int, pv_cpu_ops.write_msr, 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); \ + BUG_ON(_err); \ val1 = (u32)_l; \ val2 = _l >> 32; \ } while (0) -#define wrmsr(msr, val1, val2) \ -do { \ - paravirt_write_msr(msr, val1, val2); \ +#define wrmsr(msr, val1, val2) \ +do { \ + int _err; \ + _err = paravirt_write_msr(msr,...

...arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -98,11 +98,6 @@ static inline void halt(void) PVOP_VCALL0(pv_irq_ops.halt); } -static inline void wbinvd(void) -{ - PVOP_VCALL0(pv_cpu_ops.wbinvd); -} - #define get_kernel_rpl() (pv_info.kernel_rpl) static inline u64 paravirt_read_msr(unsigned msr) diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 280d94c36dad..0e112f279514 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -137,7 +137,6 @@ struct pv_cpu_ops { void (*set_iopl_mask)(...

...) @@ -531,7 +524,12 @@ static inline void wbinvd(void) PVOP_VCALL0(wbinvd); } -#define get_kernel_rpl() (paravirt_ops.kernel_rpl) +#define get_kernel_rpl() \ +({ \ + short kernel_cs; \ + savesegment(cs, kernel_cs); \ + (kernel_cs & SEGMENT_RPL_MASK); \ +}) static inline u64 paravirt_read_msr(unsigned msr, int *err) { @@ -799,6 +797,8 @@ static inline void pte_update_defer(stru } #ifdef CONFIG_X86_PAE +extern int use_shared_kernel_pmd; + static inline pte_t __pte(unsigned long long val) { unsigned long long ret = PVOP_CALL2(unsigned long long, make_pte, diff -r a6889086a657 inc...

...) @@ -531,7 +524,12 @@ static inline void wbinvd(void) PVOP_VCALL0(wbinvd); } -#define get_kernel_rpl() (paravirt_ops.kernel_rpl) +#define get_kernel_rpl() \ +({ \ + short kernel_cs; \ + savesegment(cs, kernel_cs); \ + (kernel_cs & SEGMENT_RPL_MASK); \ +}) static inline u64 paravirt_read_msr(unsigned msr, int *err) { @@ -799,6 +797,8 @@ static inline void pte_update_defer(stru } #ifdef CONFIG_X86_PAE +extern int use_shared_kernel_pmd; + static inline pte_t __pte(unsigned long long val) { unsigned long long ret = PVOP_CALL2(unsigned long long, make_pte, diff -r a6889086a657 inc...

...rch/x86/include/asm/paravirt.h index 3d2afecde50c..dedc89a07826 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -160,8 +160,6 @@ static inline void wbinvd(void) PVOP_VCALL0(cpu.wbinvd); } -#define get_kernel_rpl() (pv_info.kernel_rpl) - static inline u64 paravirt_read_msr(unsigned msr) { return PVOP_CALL1(u64, cpu.read_msr, msr); @@ -277,12 +275,10 @@ static inline void load_TLS(struct thread_struct *t, unsigned cpu) PVOP_VCALL2(cpu.load_tls, t, cpu); } -#ifdef CONFIG_X86_64 static inline void load_gs_index(unsigned int gs) { PVOP_VCALL1(cpu.load_gs_inde...

...rch/x86/include/asm/paravirt.h index 3d2afecde50c..25c7a73461f6 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -160,8 +160,6 @@ static inline void wbinvd(void) PVOP_VCALL0(cpu.wbinvd); } -#define get_kernel_rpl() (pv_info.kernel_rpl) - static inline u64 paravirt_read_msr(unsigned msr) { return PVOP_CALL1(u64, cpu.read_msr, msr); @@ -277,12 +275,10 @@ static inline void load_TLS(struct thread_struct *t, unsigned cpu) PVOP_VCALL2(cpu.load_tls, t, cpu); } -#ifdef CONFIG_X86_64 static inline void load_gs_index(unsigned int gs) { PVOP_VCALL1(cpu.load_gs_inde...

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

Today paravirtualization is a all-or-nothing game: either a kernel is compiled with no paravirtualization support at all, or it is supporting paravirtualized environments like Xen pv-guests or lguest additionally to some paravirtualized tuning for KVM, Hyperv, VMWare or Xen HVM-guests. As support of pv-guests requires quite intrusive pv-hooks (e.g. all access functions to page table entries,

The long term plan has been to replace Xen PV guests by PVH. The first victim of that plan are now 32-bit PV guests, as those are used only rather seldom these days. Xen on x86 requires 64-bit support and with Grub2 now supporting PVH officially since version 2.04 there is no need to keep 32-bit PV guest support alive in the Linux kernel. Additionally Meltdown mitigation is not available in the

The long term plan has been to replace Xen PV guests by PVH. The first victim of that plan are now 32-bit PV guests, as those are used only rather seldom these days. Xen on x86 requires 64-bit support and with Grub2 now supporting PVH officially since version 2.04 there is no need to keep 32-bit PV guest support alive in the Linux kernel. Additionally Meltdown mitigation is not available in the

The long term plan has been to replace Xen PV guests by PVH. The first victim of that plan are now 32-bit PV guests, as those are used only rather seldom these days. Xen on x86 requires 64-bit support and with Grub2 now supporting PVH officially since version 2.04 there is no need to keep 32-bit PV guest support alive in the Linux kernel. Additionally Meltdown mitigation is not available in the

Hi Andi, This series of patches updates paravirt_ops in various ways. Some of the changes are plain cleanups and improvements, and some add some interfaces necessary for Xen. The brief overview: add-MAINTAINERS.patch - obvious remove-CONFIG_DEBUG_PARAVIRT.patch - no longer needed paravirt-nop.patch - mark nop operations consistently paravirt-pte-accessors.patch - operations to pack/unpack

Hi Andi, This series of patches updates paravirt_ops in various ways. Some of the changes are plain cleanups and improvements, and some add some interfaces necessary for Xen. The brief overview: add-MAINTAINERS.patch - obvious remove-CONFIG_DEBUG_PARAVIRT.patch - no longer needed paravirt-nop.patch - mark nop operations consistently paravirt-pte-accessors.patch - operations to pack/unpack

A lot of cleanup after removal of 32-bit Xen PV guest support in paravirt code. Changes in V4: - dropped patches 1-3, as already committed - addressed comments to V3 - added new patches 5+6 Changes in V3: - addressed comments to V2 - split patch 1 into 2 patches - new patches 3 and 7 Changes in V2: - rebase to 5.8 kernel - addressed comments to V1 - new patches 3 and 4 Juergen Gross (6):

Hi Andi, Here's a repost of the paravirt_ops update series I posted the other day. Since then, I found a few potential bugs with patching clobbering, cleaned up and documented paravirt.h and the patching machinery. Overview: add-MAINTAINERS.patch obvious remove-CONFIG_DEBUG_PARAVIRT.patch No longer meaningful or needed. paravirt-nop.patch Clean up nop paravirt_ops functions, mainly to

Hi Andi, Here's a repost of the paravirt_ops update series I posted the other day. Since then, I found a few potential bugs with patching clobbering, cleaned up and documented paravirt.h and the patching machinery. Overview: add-MAINTAINERS.patch obvious remove-CONFIG_DEBUG_PARAVIRT.patch No longer meaningful or needed. paravirt-nop.patch Clean up nop paravirt_ops functions, mainly to

This series removes some no longer needed stuff from paravirt infrastructure and puts large quantities of paravirt ops under a new config option PARAVIRT_XXL which is selected by XEN_PV only. A pvops kernel without XEN_PV being configured is about 2.5% smaller with this series applied. tip commit 5800dc5c19f34e6e03b5adab1282535cb102fafd ("x86/paravirt: Fix spectre-v2 mitigations for

Paravirt ops is currently only capable of either replacing a lot of Linux internal code or none at all. The are users that don't need all of the possibilities pv-ops delivers though. On KVM for example we're perfectly fine not using the PV MMU, thus not touching any MMU code. That way we don't have to improve pv-ops to become fast, we just don't compile the MMU parts in! This

Paravirt ops is currently only capable of either replacing a lot of Linux internal code or none at all. The are users that don't need all of the possibilities pv-ops delivers though. On KVM for example we're perfectly fine not using the PV MMU, thus not touching any MMU code. That way we don't have to improve pv-ops to become fast, we just don't compile the MMU parts in! This