| Message ID | 20240626140307.1026816-1-alex.bennee@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [RFC] target/i386: restrict SEV to 64 bit host builds | expand |
On Wed, Jun 26, 2024 at 03:03:07PM +0100, Alex Bennée wrote: > Re-enabling the 32 bit host build on i686 showed the recently merged > SEV code doesn't take enough care over its types. While the format > strings could use more portable types there isn't much we can do about > casting uint64_t into a pointer. The easiest solution seems to be just > to disable SEV for a 32 bit build. It's highly unlikely anyone would > want this functionality anyway. > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > --- > target/i386/sev.h | 2 +- > target/i386/meson.build | 4 ++-- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/target/i386/sev.h b/target/i386/sev.h > index 858005a119..b0cb9dd7ed 100644 > --- a/target/i386/sev.h > +++ b/target/i386/sev.h > @@ -45,7 +45,7 @@ typedef struct SevKernelLoaderContext { > size_t cmdline_size; > } SevKernelLoaderContext; > > -#ifdef CONFIG_SEV > +#if defined(CONFIG_SEV) && defined(HOST_X86_64) > bool sev_enabled(void); > bool sev_es_enabled(void); > bool sev_snp_enabled(void); > diff --git a/target/i386/meson.build b/target/i386/meson.build > index 075117989b..d2a008926c 100644 > --- a/target/i386/meson.build > +++ b/target/i386/meson.build > @@ -6,7 +6,7 @@ i386_ss.add(files( > 'xsave_helper.c', > 'cpu-dump.c', > )) > -i386_ss.add(when: 'CONFIG_SEV', if_true: files('host-cpu.c', 'confidential-guest.c')) > +i386_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('host-cpu.c', 'confidential-guest.c')) > > # x86 cpu type > i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c')) > @@ -21,7 +21,7 @@ i386_system_ss.add(files( > 'cpu-apic.c', > 'cpu-sysemu.c', > )) > -i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) > +i386_system_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) > > i386_user_ss = ss.source_set() Instead of changing each usage of CONFIG_SEV, is it better to prevent it getting enabled in the first place ? eg. move #CONFIG_SEV=n From configs/devices/i386-softmmu/default.mak to configs/devices/x86_64-softmmu/default.mak And then also change hw/i386/Kconfig to say config SEV bool select X86_FW_OVMF depends on KVM && X86_64 With regards, Daniel
On 6/26/24 07:03, Alex Bennée wrote: > While the format > strings could use more portable types there isn't much we can do about > casting uint64_t into a pointer. Use uintptr_t, obviously. r~
Daniel P. Berrangé <berrange@redhat.com> writes: > On Wed, Jun 26, 2024 at 03:03:07PM +0100, Alex Bennée wrote: >> Re-enabling the 32 bit host build on i686 showed the recently merged >> SEV code doesn't take enough care over its types. While the format >> strings could use more portable types there isn't much we can do about >> casting uint64_t into a pointer. The easiest solution seems to be just >> to disable SEV for a 32 bit build. It's highly unlikely anyone would >> want this functionality anyway. >> >> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> >> --- >> target/i386/sev.h | 2 +- >> target/i386/meson.build | 4 ++-- >> 2 files changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/target/i386/sev.h b/target/i386/sev.h >> index 858005a119..b0cb9dd7ed 100644 >> --- a/target/i386/sev.h >> +++ b/target/i386/sev.h >> @@ -45,7 +45,7 @@ typedef struct SevKernelLoaderContext { >> size_t cmdline_size; >> } SevKernelLoaderContext; >> >> -#ifdef CONFIG_SEV >> +#if defined(CONFIG_SEV) && defined(HOST_X86_64) >> bool sev_enabled(void); >> bool sev_es_enabled(void); >> bool sev_snp_enabled(void); >> diff --git a/target/i386/meson.build b/target/i386/meson.build >> index 075117989b..d2a008926c 100644 >> --- a/target/i386/meson.build >> +++ b/target/i386/meson.build >> @@ -6,7 +6,7 @@ i386_ss.add(files( >> 'xsave_helper.c', >> 'cpu-dump.c', >> )) >> -i386_ss.add(when: 'CONFIG_SEV', if_true: files('host-cpu.c', 'confidential-guest.c')) >> +i386_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('host-cpu.c', 'confidential-guest.c')) >> >> # x86 cpu type >> i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c')) >> @@ -21,7 +21,7 @@ i386_system_ss.add(files( >> 'cpu-apic.c', >> 'cpu-sysemu.c', >> )) >> -i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) >> +i386_system_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) >> >> i386_user_ss = ss.source_set() > > Instead of changing each usage of CONFIG_SEV, is it better to > prevent it getting enabled in the first place ? > > eg. move > > #CONFIG_SEV=n > > From > > configs/devices/i386-softmmu/default.mak > > to > > configs/devices/x86_64-softmmu/default.mak > > And then also change > > hw/i386/Kconfig > > to say > > config SEV > bool > select X86_FW_OVMF > depends on KVM && X86_64 I was wondering if I could do it all with Kconfig. Will respin thanks. > > > With regards, > Daniel
On 26/6/24 16:20, Daniel P. Berrangé wrote: > On Wed, Jun 26, 2024 at 03:03:07PM +0100, Alex Bennée wrote: >> Re-enabling the 32 bit host build on i686 showed the recently merged >> SEV code doesn't take enough care over its types. While the format >> strings could use more portable types there isn't much we can do about >> casting uint64_t into a pointer. The easiest solution seems to be just >> to disable SEV for a 32 bit build. It's highly unlikely anyone would >> want this functionality anyway. >> >> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> >> --- >> target/i386/sev.h | 2 +- >> target/i386/meson.build | 4 ++-- >> 2 files changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/target/i386/sev.h b/target/i386/sev.h >> index 858005a119..b0cb9dd7ed 100644 >> --- a/target/i386/sev.h >> +++ b/target/i386/sev.h >> @@ -45,7 +45,7 @@ typedef struct SevKernelLoaderContext { >> size_t cmdline_size; >> } SevKernelLoaderContext; >> >> -#ifdef CONFIG_SEV >> +#if defined(CONFIG_SEV) && defined(HOST_X86_64) >> bool sev_enabled(void); >> bool sev_es_enabled(void); >> bool sev_snp_enabled(void); >> diff --git a/target/i386/meson.build b/target/i386/meson.build >> index 075117989b..d2a008926c 100644 >> --- a/target/i386/meson.build >> +++ b/target/i386/meson.build >> @@ -6,7 +6,7 @@ i386_ss.add(files( >> 'xsave_helper.c', >> 'cpu-dump.c', >> )) >> -i386_ss.add(when: 'CONFIG_SEV', if_true: files('host-cpu.c', 'confidential-guest.c')) >> +i386_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('host-cpu.c', 'confidential-guest.c')) >> >> # x86 cpu type >> i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c')) >> @@ -21,7 +21,7 @@ i386_system_ss.add(files( >> 'cpu-apic.c', >> 'cpu-sysemu.c', >> )) >> -i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) >> +i386_system_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) >> >> i386_user_ss = ss.source_set() > > Instead of changing each usage of CONFIG_SEV, is it better to > prevent it getting enabled in the first place ? > > eg. move > > #CONFIG_SEV=n > > From > > configs/devices/i386-softmmu/default.mak > > to > > configs/devices/x86_64-softmmu/default.mak > > And then also change > > hw/i386/Kconfig > > to say > > config SEV > bool > select X86_FW_OVMF > depends on KVM && X86_64 Both are *targets*, IIUC we want to disable on *hosts*.
On 6/26/24 16:03, Alex Bennée wrote: > Re-enabling the 32 bit host build on i686 showed the recently merged > SEV code doesn't take enough care over its types. While the format > strings could use more portable types there isn't much we can do about > casting uint64_t into a pointer. The easiest solution seems to be just > to disable SEV for a 32 bit build. It's highly unlikely anyone would > want this functionality anyway. It's better style to just fix the compilation issues. I'll send a small series once I test it. Paolo > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > --- > target/i386/sev.h | 2 +- > target/i386/meson.build | 4 ++-- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/target/i386/sev.h b/target/i386/sev.h > index 858005a119..b0cb9dd7ed 100644 > --- a/target/i386/sev.h > +++ b/target/i386/sev.h > @@ -45,7 +45,7 @@ typedef struct SevKernelLoaderContext { > size_t cmdline_size; > } SevKernelLoaderContext; > > -#ifdef CONFIG_SEV > +#if defined(CONFIG_SEV) && defined(HOST_X86_64) > bool sev_enabled(void); > bool sev_es_enabled(void); > bool sev_snp_enabled(void); > diff --git a/target/i386/meson.build b/target/i386/meson.build > index 075117989b..d2a008926c 100644 > --- a/target/i386/meson.build > +++ b/target/i386/meson.build > @@ -6,7 +6,7 @@ i386_ss.add(files( > 'xsave_helper.c', > 'cpu-dump.c', > )) > -i386_ss.add(when: 'CONFIG_SEV', if_true: files('host-cpu.c', 'confidential-guest.c')) > +i386_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('host-cpu.c', 'confidential-guest.c')) > > # x86 cpu type > i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c')) > @@ -21,7 +21,7 @@ i386_system_ss.add(files( > 'cpu-apic.c', > 'cpu-sysemu.c', > )) > -i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) > +i386_system_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) > > i386_user_ss = ss.source_set() >
diff --git a/target/i386/sev.h b/target/i386/sev.h index 858005a119..b0cb9dd7ed 100644 --- a/target/i386/sev.h +++ b/target/i386/sev.h @@ -45,7 +45,7 @@ typedef struct SevKernelLoaderContext { size_t cmdline_size; } SevKernelLoaderContext; -#ifdef CONFIG_SEV +#if defined(CONFIG_SEV) && defined(HOST_X86_64) bool sev_enabled(void); bool sev_es_enabled(void); bool sev_snp_enabled(void); diff --git a/target/i386/meson.build b/target/i386/meson.build index 075117989b..d2a008926c 100644 --- a/target/i386/meson.build +++ b/target/i386/meson.build @@ -6,7 +6,7 @@ i386_ss.add(files( 'xsave_helper.c', 'cpu-dump.c', )) -i386_ss.add(when: 'CONFIG_SEV', if_true: files('host-cpu.c', 'confidential-guest.c')) +i386_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('host-cpu.c', 'confidential-guest.c')) # x86 cpu type i386_ss.add(when: 'CONFIG_KVM', if_true: files('host-cpu.c')) @@ -21,7 +21,7 @@ i386_system_ss.add(files( 'cpu-apic.c', 'cpu-sysemu.c', )) -i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) +i386_system_ss.add(when: ['CONFIG_SEV', 'HOST_X86_64'], if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c')) i386_user_ss = ss.source_set()
Re-enabling the 32 bit host build on i686 showed the recently merged SEV code doesn't take enough care over its types. While the format strings could use more portable types there isn't much we can do about casting uint64_t into a pointer. The easiest solution seems to be just to disable SEV for a 32 bit build. It's highly unlikely anyone would want this functionality anyway. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> --- target/i386/sev.h | 2 +- target/i386/meson.build | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)