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target/i386: Pass buffer and length to XSAVE helper 

In preparation for removing assumptions about XSAVE area offsets, pass
a buffer pointer and buffer length to the XSAVE helper functions.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
Message-Id: <20210705104632.2902400-5-david.edmondson@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Edmondson 2021-07-05 11:46:28 +01:00 committed by Paolo Bonzini
parent fde7482100
commit c0198c5f87
5 changed files with 29 additions and 28 deletions
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5
target/i386/cpu.h
View File

@ -1667,6 +1667,7 @@ typedef struct CPUX86State {
uint64_t apic_bus_freq;
#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
void *xsave_buf;
uint32_t xsave_buf_len;
#endif
#if defined(CONFIG_KVM)
struct kvm_nested_state *nested_state;
@ -2227,8 +2228,8 @@ void x86_cpu_dump_local_apic_state(CPUState *cs, int flags);
/* cpu.c */
bool cpu_is_bsp(X86CPU *cpu);
void x86_cpu_xrstor_all_areas(X86CPU *cpu, const X86XSaveArea *buf);
void x86_cpu_xsave_all_areas(X86CPU *cpu, X86XSaveArea *buf);
void x86_cpu_xrstor_all_areas(X86CPU *cpu, const void *buf, uint32_t buflen);
void x86_cpu_xsave_all_areas(X86CPU *cpu, void *buf, uint32_t buflen);
void x86_update_hflags(CPUX86State* env);
static inline bool hyperv_feat_enabled(X86CPU *cpu, int feat)

3
target/i386/hvf/hvf.c
View File

@ -267,7 +267,8 @@ int hvf_arch_init_vcpu(CPUState *cpu)
wvmcs(cpu->hvf->fd, VMCS_TPR_THRESHOLD, 0);
x86cpu = X86_CPU(cpu);
x86cpu->env.xsave_buf = qemu_memalign(4096, 4096);
x86cpu->env.xsave_buf_len = 4096;
x86cpu->env.xsave_buf = qemu_memalign(4096, x86cpu->env.xsave_buf_len);
hv_vcpu_enable_native_msr(cpu->hvf->fd, MSR_STAR, 1);
hv_vcpu_enable_native_msr(cpu->hvf->fd, MSR_LSTAR, 1);

19
target/i386/hvf/x86hvf.c
View File

@ -73,14 +73,12 @@ void hvf_get_segment(SegmentCache *qseg, struct vmx_segment *vmx_seg)
void hvf_put_xsave(CPUState *cpu_state)
{
void *xsave = X86_CPU(cpu_state)->env.xsave_buf;
uint32_t xsave_len = X86_CPU(cpu_state)->env.xsave_buf_len;
struct X86XSaveArea *xsave;
x86_cpu_xsave_all_areas(X86_CPU(cpu_state), xsave, xsave_len);
xsave = X86_CPU(cpu_state)->env.xsave_buf;
x86_cpu_xsave_all_areas(X86_CPU(cpu_state), xsave);
if (hv_vcpu_write_fpstate(cpu_state->hvf->fd, (void*)xsave, 4096)) {
if (hv_vcpu_write_fpstate(cpu_state->hvf->fd, xsave, xsave_len)) {
abort();
}
}
@ -158,15 +156,14 @@ void hvf_put_msrs(CPUState *cpu_state)
void hvf_get_xsave(CPUState *cpu_state)
{
struct X86XSaveArea *xsave;
void *xsave = X86_CPU(cpu_state)->env.xsave_buf;
uint32_t xsave_len = X86_CPU(cpu_state)->env.xsave_buf_len;
xsave = X86_CPU(cpu_state)->env.xsave_buf;
if (hv_vcpu_read_fpstate(cpu_state->hvf->fd, (void*)xsave, 4096)) {
if (hv_vcpu_read_fpstate(cpu_state->hvf->fd, xsave, xsave_len)) {
abort();
}
x86_cpu_xrstor_all_areas(X86_CPU(cpu_state), xsave);
x86_cpu_xrstor_all_areas(X86_CPU(cpu_state), xsave, xsave_len);
}
void hvf_get_segments(CPUState *cpu_state)

13
target/i386/kvm/kvm.c
View File

@ -1888,8 +1888,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
}
if (has_xsave) {
env->xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave));
memset(env->xsave_buf, 0, sizeof(struct kvm_xsave));
env->xsave_buf_len = sizeof(struct kvm_xsave);
env->xsave_buf = qemu_memalign(4096, env->xsave_buf_len);
memset(env->xsave_buf, 0, env->xsave_buf_len);
}
max_nested_state_len = kvm_max_nested_state_length();
@ -2469,12 +2470,12 @@ static int kvm_put_fpu(X86CPU *cpu)
static int kvm_put_xsave(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
X86XSaveArea *xsave = env->xsave_buf;
void *xsave = env->xsave_buf;
if (!has_xsave) {
return kvm_put_fpu(cpu);
}
x86_cpu_xsave_all_areas(cpu, xsave);
x86_cpu_xsave_all_areas(cpu, xsave, env->xsave_buf_len);
return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
}
@ -3119,7 +3120,7 @@ static int kvm_get_fpu(X86CPU *cpu)
static int kvm_get_xsave(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
X86XSaveArea *xsave = env->xsave_buf;
void *xsave = env->xsave_buf;
int ret;
if (!has_xsave) {
@ -3130,7 +3131,7 @@ static int kvm_get_xsave(X86CPU *cpu)
if (ret < 0) {
return ret;
}
x86_cpu_xrstor_all_areas(cpu, xsave);
x86_cpu_xrstor_all_areas(cpu, xsave, env->xsave_buf_len);
return 0;
}

17
target/i386/xsave_helper.c
View File

@ -6,14 +6,16 @@
#include "cpu.h"
void x86_cpu_xsave_all_areas(X86CPU *cpu, X86XSaveArea *buf)
void x86_cpu_xsave_all_areas(X86CPU *cpu, void *buf, uint32_t buflen)
{
CPUX86State *env = &cpu->env;
X86XSaveArea *xsave = buf;
uint16_t cwd, swd, twd;
int i;
memset(xsave, 0, sizeof(X86XSaveArea));
assert(buflen >= sizeof(*xsave));
memset(xsave, 0, buflen);
twd = 0;
swd = env->fpus & ~(7 << 11);
swd |= (env->fpstt & 7) << 11;
@ -56,17 +58,17 @@ void x86_cpu_xsave_all_areas(X86CPU *cpu, X86XSaveArea *buf)
16 * sizeof env->xmm_regs[16]);
memcpy(&xsave->pkru_state, &env->pkru, sizeof env->pkru);
#endif
}
void x86_cpu_xrstor_all_areas(X86CPU *cpu, const X86XSaveArea *buf)
void x86_cpu_xrstor_all_areas(X86CPU *cpu, const void *buf, uint32_t buflen)
{
CPUX86State *env = &cpu->env;
const X86XSaveArea *xsave = buf;
int i;
uint16_t cwd, swd, twd;
assert(buflen >= sizeof(*xsave));
cwd = xsave->legacy.fcw;
swd = xsave->legacy.fsw;
twd = xsave->legacy.ftw;
@ -108,5 +110,4 @@ void x86_cpu_xrstor_all_areas(X86CPU *cpu, const X86XSaveArea *buf)
16 * sizeof env->xmm_regs[16]);
memcpy(&env->pkru, &xsave->pkru_state, sizeof env->pkru);
#endif
}